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Molecular sieving and skeletal engineering of a pitch precursor to overcome reaction heterogeneity for high-performance hard carbon anodes in sodium-ion batteries 认领 引用
1
作者 Zenghao Wang Bin Lou +7 位作者 Jun Li Luning Chai Ning Xiang Shifu Cheng Zhichen Zhang Xiangen Shan Rongheng Gou Dong Liu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第5期290-301,I0007,共12页
Pitch-derived hard carbons(HC)are promising anodes for sodium-ion batteries(SIBs)due to their high carbonization yield and low cost.However,the inherent compositional heterogeneity of pitch induces non-uniform oxidati... Pitch-derived hard carbons(HC)are promising anodes for sodium-ion batteries(SIBs)due to their high carbonization yield and low cost.However,the inherent compositional heterogeneity of pitch induces non-uniform oxidative cross-linking during conventional pre-oxidation,which not only renders the microstructure of HC difficult to regulate but also significantly degrades its sodium storage performance.Here,we identify the“shielding effect”of oxidation-inert components in pitch as the root cause of this structural inhomogeneity.To overcome this limitation,we propose a novel“sieving-and-reinforcement strategy”.This involves liquid-phase crosslinking to construct a polar three-dimensional(3D)carbon skeleton,followed by stepwise extraction as a molecular sieving process to remove inert components and expose the reactive skeleton,and finally,oxygen etching as a reinforcement step to drastically enhance the crosslinking density and defect population.This controllably engineered carbon skeleton in-situ evolves into an HC with a uniform hierarchical porous structure,featuring abundant ultramicropores,optimally sized closed pores(-2.15 nm),and ultrathin pore walls during carbonization.The resulting HC anode delivers a high reversible capacity of 363.3 mAh g-1at 50 mA g-1,with an impressive plateau capacity contribution of 71.5%.It also demonstrates exceptional cycling stability,retaining203.1 mAh g-1after 500 cycles at a high current density of 1000 mA g-1.This work provides a fundamental understanding of precursor engineering,paving the way for the rational design of advanced carbon materials for next-generation energy storage. 展开更多
关键词 Hard carbon Sodium-ion batteries Pitch Precursor engineering Reaction heterogeneity Skeletal engineering Closed pores
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Hard/Soft Carbon with Tuned Porosity and Defect Via Coating ZIF-8 by Coal Tar Pitch for High-Performance Supercapacitor 认领 引用
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作者 Zelong Shen Dedong Jia +6 位作者 Wen Zhou Kun Zheng Hongqiang Li Yuanhua Sang Yaohui Lv Jieshan Qiu Xiaojun He 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2026年第1期464-477,共14页
Metal-organic framework(MOF)-derived porous carbon has attracted particular attention in the electrochemical energy storage field,of which the key is the design and preparation of electrode materials with adjustable p... Metal-organic framework(MOF)-derived porous carbon has attracted particular attention in the electrochemical energy storage field,of which the key is the design and preparation of electrode materials with adjustable porosity and defects for supercapacitors.Here,a novel strategy of coating ZIF-8 with coal tar pitch(CTP)is presented to tailor the porosity and defects of derived porous carbon,by which the inward contraction of ZIF-8 is prevented to enlarge the ultra-micropores,and the defects of ZIF-8-derived carbon are repaired to form a continuous conjugated network.The tradeoff between porosity and electrical conductivity endows this novel hard/soft carbon electrode with fast ion/electron diffusion,achieving high yet balanced capacitance and rate performance of a top-level specific area-normalized capacitance(40μF cm-2)and a capacitance retention of 52.1%at a 1000-fold increased current density.Meanwhile,the novel electrode realizes a high capacitance of 704 F g-1at 1 A g-1and capacitance retention of 91.9%after 50000 cycles in KOH+PPD electrolyte.This study provides an effective approach to designing novel hard/soft carbon with tuned porosity and carbon defects from MOFs and CTP for supercapacitors and other metal-ion batteries. 展开更多
关键词 carbon defect coal tar pitch high-rate supercapacitors ZIF-8
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Stress path effect and loading failure mechanism of surrounding rock in steeply dipping pitching oblique stope 认领 引用
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作者 HUANG Bao-fa XIE Pan-shi +6 位作者 WU Yong-ping ZHANG Xi ZHAO Wei-gang DUAN Si-yu LI Guo-xin YI Lei-lei XU Hui 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第6期2627-2650,共24页
Discovering and revealing the stress path effect and load failure mechanism of surrounding rock in steeply dipping pitching oblique stope is the basis for realizing safe and efficient mining of such coal seams.Based o... Discovering and revealing the stress path effect and load failure mechanism of surrounding rock in steeply dipping pitching oblique stope is the basis for realizing safe and efficient mining of such coal seams.Based on the study of the evolution law of roof caving and filling in pitching oblique stope,the three-dimensional physical simulation experiment,numerical calculation,theoretical analysis and field monitoring are used to reveal the load and instability mechanism of roof rock mass structure in different areas under the non-equilibrium constraint of gangue,and the temporal and spatial evolution law of overburden mining stress in different positions along the strike and tendency of working face is deeply analyzed.The results show that there are obvious regional characteristics of roof fracture and migration in steeply dipping pitching oblique stope.The lower fracture lags behind the middle and upper parts,and the effective support area of filling gangue is about 2/5 of the length of working face.The basic roof stress evolves from a wedge to an inverted trapezoid.The roof strata are damaged by tension and compression in the middle and upper regions,and by compression in the lower region.With the advancement of the working face,the magnitude and direction of the three-dimensional mining stress of the overlying rock have changed significantly.The asymmetric deflection transfer of the stress path leads to the failure and instability of the rock layer inside the bearing arch,and the bearing arch increases first and then tends to be stable.The peak abutment pressure of surrounding rock has a cumulative effect.The stress concentration in the lower area has a lag.The peak abutment pressure in the upper area is smaller than that in the true inclined working face,and the stability of the roof is enhanced.The peak values of the bending moment in the upper,middle and lower regions of the inclination are 483.71,306.95 and 230.26 kN·m,respectively,and the peak values are located at 2−3 m in front of the coal wall.The relationship between the'support-surrounding rock'of the stope presents significant regional characteristics.The research results have important guiding significance for the stability control of surrounding rock and safe and efficient mining of scarce high-quality coal seams,such as steeply dipping coal seams. 展开更多
关键词 steeply dipping coal seam pitching oblique stope gangue sliding filling stress path fracture instability
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不同Pitch值在能谱CTA对下肢动脉闭塞性疾病效果显示评价 认领 引用
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作者 张莉萍 李朋 +1 位作者 刘珊 王爱军 《内蒙古医学杂志》 2026年第4期391-396,共6页
目的应用256排Revolution CT两种不同螺距(Pitch)的能谱成像技术(gemstone spectrum imaging,CSI)对下肢动脉闭塞性疾病的CT血管造影(CT angiography,CTA)质量进行对比研究,探讨GSI大Pitch技术在下肢动脉CTA检查中保证成像质量、降低X... 目的应用256排Revolution CT两种不同螺距(Pitch)的能谱成像技术(gemstone spectrum imaging,CSI)对下肢动脉闭塞性疾病的CT血管造影(CT angiography,CTA)质量进行对比研究,探讨GSI大Pitch技术在下肢动脉CTA检查中保证成像质量、降低X线辐射剂量的可行性和应用价值。方法选取50例下肢动脉闭塞性疾病的患者分为A、B两组,每组25例,A组(大Pitch)的Pitch值为0.984∶1,B组(小Pitch)的Pitch值为0.516∶1。50例患者均进行双下肢动脉CTA检查,扫描后记录容积CT剂量指数(CT dose index volumes,CTDIvol)、剂量长度乘积(dose length product,DLP)及计算有效剂量(effect dose,ED)。分别测量A、B组在74 KeV、65 KeV、54 KeV时腹主动脉、股动脉、腘动脉及足背动脉的CT值及相应的肌肉的SD值,并计算信噪比(signal noise ratio,SNR)和对比噪声比(contrast to noise ratio,CNR)。评价A、B两组影像质量并进行统计学分析。结果A组的CTDIvol 7.75Gy、DLP(895.90±146.48)Gy·cm、ED(13.44±2.20)mSv均明显低于B组。两组内均显示54 KeV单能量图像质量最佳。两组的影像质量客观评分髂-股动脉端和小腿-足背动脉段的影像质量客观评分(SNR、CNR)值在组间无明显差异(P>0.05)。两组的影像质量主观评分无显著性差异(P>0.05)。结论本研究表明,下肢动脉CTA应用GSI大Pitch扫描技术结合GSI单能量能够清晰下肢动脉闭塞性疾病侧枝血管,并能有效降低X线辐射剂量。 展开更多
关键词 Pitch 能谱扫描技术 单能量 下肢动脉CTA 低剂量 图像质量
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Bifunctional crosslinking-induced structural engineering towards improved sodium storage in pitch-derived hard carbon 认领 引用
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作者 Yanqing Wu Ying Mo +8 位作者 Wang Zhou Liqiang Ouyang Biao Zheng Guoku Liu Hui Liu Aiping Hu Yan Duan Wenbin Zhong Jilei Liu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第5期134-143,I0005,共10页
The construction of crosslinking structures in pitch-derived carbons is essential for disrupting intrinsicπ-πstacking and achieving high performance sodium-ion batteries.However,the structural collapse caused by the... The construction of crosslinking structures in pitch-derived carbons is essential for disrupting intrinsicπ-πstacking and achieving high performance sodium-ion batteries.However,the structural collapse caused by the pyrolysis-oxidation kinetic mismatch and the challenge of rational crosslinker selection remain significant obstacles.Herein,we introduce a bifunctional crosslinking agent that simultaneously accelerates oxidative ring-opening and reinforces covalent network formation,thereby overcoming the kinetic imbalance between oxidation and pyrolysis.Specifically,3,4,9,10-perylenetetracarboxylic dianhydride(PTCDA)not only promotes generating oxygen-free radicals due to the low bond energy of its C-O bonds but also reacts with oxygen-containing functional groups in oxidized pitch to form covalent linkages,thereby further increasing crosslinking density.Consequently,the resulting hard carbons exhibit expanded interlayer spacing(d002)and a defect-rich hierarchical porous structure.This gives rise to high reversible capacity(328.32 mAh g-1),excellent rate capability(171.54 mAh g-1at 400 mA g-1),and outstanding cycling stability(93.4%capacity retention after 200 cycles at 40 mA g-1).Moreover,its practical feasibility is demonstrated in full cells.This work establishes a robust paradigm for developing nextgeneration hard carbon anodes by synergistically optimizing the bonding configuration of precursors,pore architecture,and carbon framework,while offering deep mechanistic insight into the pitch crosslinking process. 展开更多
关键词 Pitch Bifunctional crosslinking agent Hard carbon Sodium-ion batteries
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Statistical study on the correlation between chorus waves and pitch angle distributions of outer radiation belt relativistic electrons 认领 引用
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作者 Hui Zhao Chang Yang +6 位作者 FuLiang Xiao Si Liu QingHua Zhou Sai Zhang ZhongLei Gao YuYue Jin Yihua He 《Earth and Planetary Physics》 EI CSCD 2026年第4期659-667,共9页
The Earth's outer radiation belt contains a large number of relativistic(500 keV)electrons,which can exhibit different pitch angle distributions(PADs).Whistler-mode chorus waves are considered an important factor ... The Earth's outer radiation belt contains a large number of relativistic(500 keV)electrons,which can exhibit different pitch angle distributions(PADs).Whistler-mode chorus waves are considered an important factor governing the evolution of electron PADs,but their long-term and global effects remain insufficiently studied.This paper presents a statistical analysis using observations from the Van Allen Probes during 2013-2018.A pitch angle anisotropy index A is employed to characterize electron PADs,and its correlation with chorus waves is investigated.Statistical results show that when chorus waves intensify,the index A increases,implying that electrons tend to exhibit pancake PADs.In addition,the index A is found to be positively correlated with enhanced solar wind dynamic pressure or substorm activity.Our results demonstrate that chorus waves play an important role in accelerating relativistic electrons and reshaping their PADs,which contributes to a deeper insight into the physical mechanisms underlying the dynamic evolution of the outer radiation belt. 展开更多
关键词 outer radiation belt relativistic electrons pitch angle distribution whistler-mode chorus wave−particle Interaction
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Effect of Precursor Structure on Pore Evolution of Pitch-Derived Porous Carbon Nanoarchitectonics 认领 引用
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作者 Yajie Duan Keyan Xu +2 位作者 Yichao Zou Rujun Zha Hao Ling 《Carbon and Hydrogen》 SCIE CAS CSCD 2026年第2期244-254,共11页
Developing high-performance porous carbons(PCs)requires precise microstructural control,which can be effectively understood within the framework of nanoarchitectonics.Mesophase pitch is considered an ideal precursor f... Developing high-performance porous carbons(PCs)requires precise microstructural control,which can be effectively understood within the framework of nanoarchitectonics.Mesophase pitch is considered an ideal precursor for preparing high-performance PCs.However,the intrinsic impact of precursor micro-texture,specifically the degree of optical anisotropy remains underexplored.This study systematically investigates the evolution of pore architecture in PCs derived from mesophase pitch with varying mesophase contents.It is demonstrated a strong correlation between the graphitic domain arrangement of mesophase pitch precursor and the activation efficiency of potassium hydroxide(KOH).A moderate mesophase content(30%-60%)is identified as the optimal window,facilitating the formation of a 3D honeycomb-like robust hierarchically porous network with enhanced specific surface area and balanced pore size distribution.Unlike highly ordered precursors that resist etching or amorphous precursors that suffer structural collapse,the moderate mesophase content precursor enables a synergistic mechanism of intercalation and controlled gasification.These findings provide fundamental insights into the nanoarchitectonics of pitch-derived PCs and offer a practical criterion for precursor selection in the scalable production of high-performance PCs. 展开更多
关键词 graphitic ordering mesophase pitch porous carbon
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ZnAl-layered double hydroxides template-induced formation of ZnO/ZnSe heterostructures on the surface of coal-tar-pitchderived carbon for high-efficiency sodium storage 认领 引用
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作者 Yibo Zhao Peihua Li +6 位作者 Rufeng Tian Haochen Xie Yalong Wang Wanggang Zhang Xiaohong Li Jian Wang Yiming Liu 《Energy Materials and Devices》 CAS 2026年第2期16-30,共15页
Developing high-performance anodes from low-cost industrial byproducts is crucial for advancing sodium-ion batteries.Herein,we report a zinc–aluminum layered double hydroxide(ZnAl-LDH)template-induced strategy for fa... Developing high-performance anodes from low-cost industrial byproducts is crucial for advancing sodium-ion batteries.Herein,we report a zinc–aluminum layered double hydroxide(ZnAl-LDH)template-induced strategy for fabricating ZnO/ZnSe heterojunctions embedded within hierarchical porous carbon derived from coal tar pitch.The LDH serves as a dual functional structural template and pore-forming agent,enabling the in situ construction of intimately coupled ZnO/ZnSe–C interfaces.The designed ZnO/ZnSe heterostructure offers notable advantages:the heterojunction boosts charge transfer via interfacial contact between the two active components,while the mixed O2−/Se2−anion environment,combined with nanodispersed ZnO/ZnSe and the conductive carbon matrix,effectively enhances the reaction kinetics and mitigates volume strain.Consequently,the composite anode delivers a high reversible capacity of 637.5 mAh g−1 at 100 mA g−1 and retains 259.7 mAh g−1 after 1000 cycles at 5 A g−1.Kinetic analysis indicates that the superior rate performance is attributed to a dominant capacitive contribution(93.3%at 1.2 mV s−1).A full cell configured with an Na3V2(PO4)3 cathode demonstrates practical viability,retaining 147.5 mAh g−1 after 100 cycles.This work highlights the effectiveness of LDH-templated synthesis in constructing advanced heterostructure anodes for efficient sodium storage. 展开更多
关键词 anode material coal tar pitch layered double hydroxide heterostructure ZnSe sodium-ion battery
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Rapidly fabricated carbon/carbon composites with a mesophase pitch binder and graphite flake filler with excellent EMI shielding and thermal conductivity 认领 引用
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作者 Luo Pengfei Tian Shan +1 位作者 Guo Fengjun Xiao Zhichao 《新型炭材料（中英文）》 SCIE EI CSCD 北大核心 2026年第3期597-611,I0006,I0007,共15页
Carbon/carbon(C/C)composites are ideal materials for electromagnetic interference(EMI)shielding and thermal management in the aerospace field because of their low density.However,traditional C/C composites primarily r... Carbon/carbon(C/C)composites are ideal materials for electromagnetic interference(EMI)shielding and thermal management in the aerospace field because of their low density.However,traditional C/C composites primarily rely on repeated densification to increase their EMI shielding effectiveness(SE),which not only increases density but also involves lengthy preparation cycles.We have constructed a unidirectional(1D)C/C composite using a matrix of mesophase pitch-derived carbon and graphite flakes,reinforced with mesophase pitch-based carbon fibers.Using a one-step consolidation process produced by spontaneous assembly during heating,the open pores and a continuous conductive network give the composite an EMI SE of up to 83.97 dB in the 8.2-12.4 GHz(X-band).The material also has a thermal conductivity of 191.84 W·m−1·K−1and an electrical conductivity of 6.50×104S·m−1along the fiber direction,together with a flexural strength exceeding 100 MPa,while having a bulk density of only 1.01 g·cm−3.This work therefore presents a short-cycle fabrication strategy for low-density C/C composites that integrate high EMI SE,efficient thermal management,and good mechanical properties. 展开更多
关键词 Carbon/carbon(C/C)composites Mesophase pitch Electromagnetic interference(EMI)shielding Thermal conductivity Electrical conductivity
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Predicting elbow valgus torque from upper extremity baseball pitching kinematics using markerless motion capture 认领 引用
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作者 Adam R.Nebel Abigail C.Schmitt 《Sports Medicine and Health Science》 CAS CSCD 2026年第4期426-430,共5页
Background:Markerless motion capture in sport is becoming widely available and increasingly popular.Because of the increase in popularity,it is important to determine if the values reported by these systems are simila... Background:Markerless motion capture in sport is becoming widely available and increasingly popular.Because of the increase in popularity,it is important to determine if the values reported by these systems are similar to that of previous research,and for the purposes of injury prevention,if these values are able to predict elbow stress.Purpose:We aimed to investigate if elbow valgus torque can be predicted using data gathered with a KinaTrax®markerless motion capture system.Study Design:Cross-Sectional Study.Methods:Twenty-one college baseball pitchers partook in a preseason practice where they threw bullpen pitching sessions.An eight camera KinaTrax®markerless motion capture bullpen system,capturing at 300 Hz,was used to capturing their pitching motion.One fastball from each pitcher was randomly selected for analysis.A multiple regression analysis approach was used to predict peak elbow valgus torque using upper extremity kinematics.Results:The combination of maximum external rotation angle,elbow flexion angle at peak elbow valgus torque,elbow flexion angle at ball release,and percent of the pitching cycle when peak elbow flexion angle occurred significantly predicted peak elbow valgus torque(F4,16=5.819,R2=0.593,p=0.004).Additionally,reported values were similar to those of published research in baseball pitching biomechanics.Conclusion:These findings suggest ecologically valid biomechanical data from markerless motion capture can be used to analyze key variables related to injury prevention in baseball pitching. 展开更多
关键词 Biomechanics Baseball Pitching Elbow torque Kinatrax Markerless motion capture
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320排宽体探测器CT动态可变螺距扫描技术(Dynamic Pitch)用于冠状动脉疾病合并腹部疾病 认领 引用
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作者 戴工华 刘天成 +10 位作者 周慧慧 李向桃 段继瑛 金利卿 徐文 许玉红 徐柳燕 尤佳 栗娜 夏辰 路青 《中国医学影像技术》 北大核心 2026年第4期527-531,共5页
目的探讨320排宽体探测器CT动态可变螺距扫描技术(Dynamic Pitch)用于冠状动脉疾病合并腹部疾病的价值。方法前瞻性收集100例拟接受冠状动脉CT血管造影(CCTA)联合腹部四期CT增强扫描患者,随机分为观察组与对照组各50例。对观察组以可变... 目的探讨320排宽体探测器CT动态可变螺距扫描技术(Dynamic Pitch)用于冠状动脉疾病合并腹部疾病的价值。方法前瞻性收集100例拟接受冠状动脉CT血管造影(CCTA)联合腹部四期CT增强扫描患者,随机分为观察组与对照组各50例。对观察组以可变螺距、对照组以固定螺距扫描行CCTA联合腹部动脉早期增强扫描,范围均自胸廓入口至耻骨联合,对比剂注射方案相同;之后对2组均行腹部动脉晚期、门静脉期和延迟期增强扫描,范围为膈肌至耻骨联合。对图像质量进行主、客观评价。比较组间检查时间、辐射剂量及图像质量主、客观评价结果。结果观察组检查时间、剂量长度乘积及有效剂量均低于对照组(P均0.05)。结论320排宽体探测器CT Dynamic Pitch可显著降低CCTA联合腹部四期CT增强扫描检查时间和辐射剂量并保证图像质量。 展开更多
关键词 冠状血管 CT血管成像 腹部 螺距 图像质量
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Preparation and tailoring electromagnetic shielding and microwave absorbing performance of Fe3O4modified activated carbon foam based on mesophase coal pitch pyrolysis foaming 认领 引用
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作者 GE Yuanyuan WANG Yuzhe +4 位作者 XU Guozhong ZHU Yaming YUAN Xia SHI Guimei ZHONG Xiangyun 《燃料化学学报（中英文）》 EI CAS CSCD 北大核心 2026年第1期120-134,共15页
The development of materials with excellent microwave absorption(MWA)and electromagnetic interference(EMI)shielding performances has currently received attention.Herein,mesophase pitch-based carbon foam(MPCF)with 3D i... The development of materials with excellent microwave absorption(MWA)and electromagnetic interference(EMI)shielding performances has currently received attention.Herein,mesophase pitch-based carbon foam(MPCF)with 3D interconnected pore structure was prepared through the high pressure pyrolysis of mesophase coal tar pitch.It is found that the 3D interconnected cellular pores of MPCF facilitate multiple reflections of electromagnetic waves,which results in the minimum reflection loss(RLmin)value of MPCF reaches-37.84 dB with the effective absorption bandwidth(EAB)of 5.44 GHz at a thickness of 2.70 mm,and the total average electromagnetic shielding effectiveness(SET)under 3.00 mm thickness achieves 26.52 dB in X-band.Subsequently,MPCF is activated by KOH to obtain activated carbon foam(A-MPCF).The average SETof A-MPCF achieves 103.00 dB for abundant nanopores on the pore cell walls,which leads to a transition from the multiple reflections of electromagnetic waves on the walls to diffuse reflection.Unfortunately,the reflection coefficient(R)of A-MPCF increases from 0.78 to 0.90.To reduce the R value,Fe3O4/A-MPCF was fabricated via the in situ growth of nano Fe3O4on A-MPCF.Consequently,the R value of Fe3O4/A-MPCF was reduced from 0.90 to 0.74,whereas the MWA performance was only slightly decreased.This work proposes a simple strategy for simultaneously adjusting MWA and EMI shielding performances of materials. 展开更多
关键词 carbon foam microwave absorption electromagnetic interference shielding mesophase pitch
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Preparation and structure evolution of coal-based needle coke by co-carbonization of coal direct liquefaction pitch and waste engine oil 认领 引用
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作者 ZHANG Yuzhu QI Yuan +2 位作者 ZHU Yaming CHENG Junxia ZHAO Xuefei 《燃料化学学报（中英文）》 EI CAS CSCD 北大核心 2026年第1期95-107,共13页
Needle coke,a highperformance artificial carbon material,requires precise composition control of its raw materials as this critically determines the structural characteristics and performance of the final product.In t... Needle coke,a highperformance artificial carbon material,requires precise composition control of its raw materials as this critically determines the structural characteristics and performance of the final product.In this study,needle coke samples were prepared from coal direct liquefaction pitch(CDLP)and waste engine oil(WEO)through component optimization and a cocarbonization process.The microstructure and properties were investigated using the following characterization techniques:Fourier Transform Infrared Spectroscopy(FT-IR),Polarized Light Microscopy(PLM),Scanning Electron Microscopy(SEM),X-ray Diffraction(XRD),Raman Spectroscopy,Thermogravimetric Analysis(TGA),Micro-Strength(MS)and Powder Resistivity(PR).The co-carbonization mechanism of CDLP and WEO was systematically investigated.The results indicated that the incorporation of WEO significantly reduced the viscosity of the co-carbonization system,and its abundant aliphatic structures provided alkyl radicals and active sites.The synergistic interaction of aromatic components between the CDLP and WEO effectively promoted the growth and order accumulation of aromatic carbon layers.When 50%WEO was introduced,the prepared needle coke exhibited an excellent microstructure and properties.The fibrous and leaflet structure content reached 76.2%,the ideal graphite lattice content reached 89.7%.These results demonstrated remarkable oxidation resistance and electrical conductivity,with a powder resistivity of 605.1 mΩ·mm.This work establishes a process with cost advantages for the production of needle coke. 展开更多
关键词 needle coke co-carbonization coal direct liquefaction pitch waste engine oil
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Effect of the addition of terephthalic acid on the formation of coal tar pitch-based mesophase in the AlCl3catalytic system 认领 引用
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作者 LI Hui YANG Tao +6 位作者 SONG Yan ZHAO Ning MA Zi-hui QI Su-xia CUI Zhen-hai TIAN Xiao-dong LIU Zhan-jun 《新型炭材料（中英文）》 SCIE EI CAS CSCD 北大核心 2025年第6期1336-1346,I0057,I0058,共11页
Reducing the amount of aluminum chloride needed for the catalytic preparation of high quality mesophase and carbon materials is important and we have found that using terephthalic acid(PTA)as a co-catalyst serves this... Reducing the amount of aluminum chloride needed for the catalytic preparation of high quality mesophase and carbon materials is important and we have found that using terephthalic acid(PTA)as a co-catalyst serves this purpose.By adding 3%(mass fraction)AlCl3and 0.9%(mass fraction)PTA to the coal tar pitch,approximately 90%mesophase was synthesized.The product(M-3-0.9)had a high stacking order(Lc=3.1 nm,n=10.14)and aromaticity(0.942).By adding PTA,a larger anisotropy content was produced using a smaller amount of AlCl3.The PTA participated in the polycondensation reaction through its own benzene ring structure to increase the catalytic activity.However,when its content was higher than 1.5%,the number of oxygen-containing groups in the product increased which was unfavorable for the aromatic lamellar stacking and gave rise to more isotropic structures.The work opens up a new way to prepare mesophase by a catalytic method. 展开更多
关键词 Mesophase pitch Coal tar pitch AlCl3catalysis Terephthalic acid Catalytic polycondensation
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Impact of pitch fraction oxidation on the structure and sodium storage properties of derived carbon materials 认领 引用 被引量：2
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作者 QI Su-xia YANG Tao +6 位作者 SONG Yan ZHAO Ning LIU Jun-qing TIAN Xiao-dong WU Jin-ru LI Hui LIU Zhan-jun 《新型炭材料（中英文）》 SCIE EI CAS CSCD 北大核心 2025年第2期421-439,共19页
Pitch produced by the lique-faction of coal was divided into two frac-tions:soluble in toluene(TS)and insol-uble in toluene but soluble in pyridine(TI-PS),and their differences in molecu-lar structure and oxidation ac... Pitch produced by the lique-faction of coal was divided into two frac-tions:soluble in toluene(TS)and insol-uble in toluene but soluble in pyridine(TI-PS),and their differences in molecu-lar structure and oxidation activity were studied.Several different carbon materi-als were produced from them by oxida-tion in air(350℃,300 mL/min)fol-lowed by carbonization(1000℃ in Ar),and the effect of the cross-linked structure on their structure and sodium storage properties was investigated.The results showed that the two pitch fractions were obviously different after the air oxidation.The TS fraction with a low degree of condensation and abundant side chains had a stronger oxidation activity and thus introduced more cross-linked oxygen-containing functional groups C(O)―O which prevented carbon layer rearrangement during the carbonization.As a result,a disordered hard carbon with more defects was formed,which improved the electrochemical performance.Therefore,the carbon materials derived from TS(O-TS-1000)had an obvious disordered structure and a larger layer spacing,giving them better sodium storage perform-ance than those derived from the TI-PS fraction(O-TI-PS-1000).The specific capacity of O-TS-1000 was about 250 mAh/g at 20 mA/g,which was 1.67 times higher than that of O-TI-PS-1000(150 mAh/g). 展开更多
关键词 Pitch fractions Air oxidation Derived carbon materials Na+storage
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Comprehensive insights into sodium storage in pitch-derived porous hard carbon 认领 引用 被引量：2
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作者 Tuo Zhao Luyao Wang +4 位作者 Chu Zhang Na Liu Chuying Ouyang Zhaoxiang Wang Liquan Chen 《Carbon Energy》 SCIE EI CSCD 2025年第7期140-152,共13页
The controversies about the mechanism of sodium storage in hard carbon(HC)hinder its rational structural design.A series of porous HC materials using coal tar pitch show a reversible capacity of 377 mAh g−1 and an ... The controversies about the mechanism of sodium storage in hard carbon(HC)hinder its rational structural design.A series of porous HC materials using coal tar pitch show a reversible capacity of 377 mAh g−1 and an initial Coulombic efficiency(ICE)of 87%as well as excellent cycling performance.More attention is paid to exploration of the relationships between the sodium status on various storage sites at different sodiation states and the ICE by solidstate23Na nuclear magnetic resonance spectroscopy.The adsorbed Na ions contribute the most to the irreversible capacity.The de-solvated Na ions entering the closed pores are reduced to Na atoms and aggregated to Na clusters.Also,this process contributes the most to the reversible capacity and is characteristic of a long plateau in the voltage profile.Intercalation is partially reversible;it is the main source of capacity for slope-type HCs but plays a minor role in the reversible capacity of plateau-type HCs.Therefore,increasing the content of the closed pores can improve the reversible plateau capacity and reducing the open mesopores of HC increases the ICE.These findings provide insights into the structural design and cost-efficient preparation of high-performance HC anode materials for advanced sodium-ion batteries. 展开更多
关键词 23Na NMR coal tar pitch porous hard carbon sodium clusters sodium-ion batteries storage mechanism
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Coal pitch-based nanosheets enhance the electronic and ionic transport of flow electrode capacitive deionization 认领 引用 被引量：1
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作者 Jincai Ran Zhaoyang Song +1 位作者 Qiongqiong He Zhenyong Miao 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第5期691-702,共12页
High-salinity wastewater treatment has always been a challenging issue.In this study,coal tar pitch was used as the carbon source and melamine as the nitrogen source to prepare coal tar pitch-based nanosheets(CPN-9)us... High-salinity wastewater treatment has always been a challenging issue.In this study,coal tar pitch was used as the carbon source and melamine as the nitrogen source to prepare coal tar pitch-based nanosheets(CPN-9)using a salt-template method.The desalination performance of CPN-9 was evaluated using flow-electrode capacitive deionization technology.The results showed that CPN-9 has a high specific surface area(466.34 m2/g),a rich pore structure(micro-/meso-pore volume was 0.28),excellent rheological properties,and hydrophilicity(contact angle of 20.44°),thereby accelerating ion transport.Electrochemical results indicated that CPN-9 exhibits a significant double-layer ion storage mechanism,with a specific capacitance of 176.66 F/g at a current density of 0.5 A/g.CPN-9 has a very low charge transfer resistance.The synergistic effect of aromatic carbon and nitrogen doping(the content of pyrrole and pyridine nitrogen was 36.40%and 35.83%,respectively)in coal tar pitch accelerates electron transfer in CPN-9.The good ion diffusion performance and low impedance of CPN-9 accelerate the ion exchange rate,resulting in outstanding desalination performance.At 1.2 V and 3%mass loading,with a CPN-9 to conductive carbon black ratio of 4:1,the average desalination rate,charge efficiency,and energy consumption reached 0.039 mg/(cm2·min),48.47%,and 0.012 kWh/mol,respectively.In summary,this study optimized the structure of CPN-9 from the perspective of electronic and ionic transport,enhancing its desalination performance and providing theoretical support for the deionization of high-salinity wastewater. 展开更多
关键词 Flow electrode capacitor deionization Coal pitch Mine water Desalination
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2D Hydrodynamic Performance of a Bottom-Hinged Flap Breakwater:Pitching Motion Response Under Random Waves and Comparison with Regular Waves 认领 引用
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作者 YIN Zegao LI Feifan +1 位作者 ZHANG Chao LI Guoqing 《Journal of Ocean University of China》 SCIE CAS CSCD 2025年第5期1206-1222,共17页
To propel the application of a bottom-hinged flap breakwater in real sea conditions,a two-dimensional computational fluid dynamics numerical model was conducted to investigate the pitching motion response and wave att... To propel the application of a bottom-hinged flap breakwater in real sea conditions,a two-dimensional computational fluid dynamics numerical model was conducted to investigate the pitching motion response and wave attenuation in random waves.First,the flow velocity distribution characteristic of the pitching flap at typical times was summarized.Then,the effects of random wave and flap parameters on the flap’s significant pitching angle amplitude θs and hydrodynamic coefficients were investigated.The results reveal that θs and wave reflection coefficient Kr values increase with increasing significant wave height Hs,random wave steepnessλs,and flap relative height.As Hs andλs increase,the wave transmission coefficient Kt increases while the wave dissipation coefficient Kd decreases.Additionally,Kt decreases with increasing flap relative height.With increasing equivalent damping coefficient ratio,θs and Kt decrease,while Kr and Kd increase.The relationships betweenλs and flap relative height on the one hand andθs,Kr,Kt,and Kd in random waves on the other hand are compared to those in regular waves.Based on the equal incident wave energy and the equal incident wave energy flux,the pitching flap performs better in the wave attenuation capability under random waves than in regular waves.Finally,the dimensionless parameters with respect to random wave and flap were used to derive the Kr and Kt for-mulae,which were validated with the related data. 展开更多
关键词 pitching flap pitching angle amplitude hydrodynamic coefficients random waves regular waves
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Microstructure modulation strategies from pitch molecules to derived carbon materials for electrochemical energy storage 认领 引用
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作者 MENG Chao ZHANG Yan +4 位作者 WANG Ning ZHENG Xue-qing KONG De-yu HU Han WU Ming-bo 《新型炭材料（中英文）》 SCIE EI CAS CSCD 北大核心 2025年第4期837-859,共23页
Pitch is a complex mixture of polycyclic aromatic hydrocarbons and their non-metal derivatives that has a high carbon content.Using pitch as a precursor for carbon materials in alkali metal ion(Li+/Na+/K+)bat... Pitch is a complex mixture of polycyclic aromatic hydrocarbons and their non-metal derivatives that has a high carbon content.Using pitch as a precursor for carbon materials in alkali metal ion(Li+/Na+/K+)batteries has become of great interest.However,its direct pyrolysis often leads to microstructures with a high orientation and small interlayer spacing due to uncontrolled liquid-phase carbonization,resulting in subpar electrochemical performance.It is therefore important to control the microstructures of pitch-derived carbon materials in order to improve their electrochemical properties.We evaluate the latest progress in the development of these materials using various microstructural engineering approaches,highlighting their use in metal-ion batteries and supercapacitors.The advantages and limitations of pitch molecules and their carbon derivatives are outlined,together with strategies for their modification in order to improve their properties for specific applications.Future research possibilities for structure optimization,scalable production,and waste pitch recycling are also considered. 展开更多
关键词 Pitch precursor Carbon materials Microstructure Modification strategies Electrochemical energy storage
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Scalable synthesis of pitch-derived soft carbon with graphitic nanodomains embedded in amorphous matrix for high-energy pouch-type lithium-ion capacitors 认领 引用
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作者 Heqiang Liu Xiong Zhang +6 位作者 Chen Li Shasha Zhao Yabin An Yibo Ma Xianzhong Sun Kai Wang Yanwei Ma 《Rare Metals》 SCIE EI CAS CSCD 2025年第12期10108-10122,共15页
Promising energy storage devices,lithium-ion capacitors(LICs),integrate the high energy density characteristic of lithium-ion batteries with the superior power density found in supercapacitors.A key challenge impeding... Promising energy storage devices,lithium-ion capacitors(LICs),integrate the high energy density characteristic of lithium-ion batteries with the superior power density found in supercapacitors.A key challenge impeding their practical deployment,however,is the kinetic disparity between the cathode's rapid charge acceptance and the anode's sluggish reaction rates.Herein,we present a cost-effective strategy to address this limitation through the rational design of pitch-derived soft carbon anodes.By precisely controlling the carbonization process of pitch,the pitch-based soft carbon material(PC800) synthesized at a carbonization temperature of 800℃ exhibits a unique hybrid structure consisting of an amorphous carbon matrix embedded with graphitic nanodomains.This hierarchical structure not only provides abundant active sites and efficient ion diffusion pathways,but also ensures rapid electron transport,thereby enabling excellent rate capability.The PC800 electrode delivers a remarkable reversible capacity of 319.2 mAh g-1 at 0.1 A g-1 and maintains 131.6 mAh g-1 even at 5 A g-1.When assembled into a full-cell LIC with activated carbon cathode,the device achieves a high energy density of 159.4 Wh kg-1 at 246.7 W kg-1 and retains 42.8 Wh kg-1 under a high power density of 11 kW kg-1(based on the total mass of active materials).Notably,the scaled-up production of PC800 demonstrates excellent structural stability and electrochemical consistency in pouch-type LICs,achieving an energy density of 30 Wh kg-1 based on the overall device mass.This work highlights the feasibility of transforming low-cost pitch precursors into high-performance carbon anodes through structural engineering,thereby enabling the industrial development of advanced LICs with balanced energy and power characteristics. 展开更多
关键词 Lithium-ion capacitors Soft carbon Anode material Pitch
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