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The feasibility for natural graphite to replace artificial graphite in organic electrolyte with different film-forming additives

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Chinese Journal of Chemical Engineering 2023年第4期56卷 58-69页

作者： Shaojun Niu Guobin Zhu Kai Wu Honghe Zheng College of Energy Soochow UniversitySuzhou 215006China Contemporary Amperex Technology Limited Ningde 352100China

The feasibility for natural graphite(NG)to replace artificial graphite(AG)in organic electrolytes with different additives are investigated.Although the strong film-forming additives contributes to form robust solid electrolyte interphase(SEI)film on graphite particle surface,great differences in gas evolution,lithium inventory loss and other side reactions are observed.Lithium bis(oxalato)borate(Li BOB)and fluoroethylene carbonate(FEC)are found more effective and the combination shows to be more promising.In the optimized electrolyte,natural graphite anode exhibits excellent long-term cycling capability.After 800 cycles at high temperature,the capacity retention is comparable to that using artificial graphite.The mechanisms for the capacity-fading of the full cells with AG and NG anode are investigated by ICP,SEM and polarization studies.The results shows that NG electrode consumes more active lithium due to the rough surface and larger volume expansion.The rapid capacity-fading in the initial 100 cycles is related to the instability of the SEI film aroused from large volume expansion.The systematic analysis is inspiriting for the development of high performance lithium ion batteries with reduced cost.

关键词： Lithium ion batteries natural graphite Electrolyte additive Solid electrolyte interphase

Carbide derived carbon electrode with natural graphite addition in magnesium electrolyte based cell for supercapacitor enhancements

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Journal of Energy Chemistry 2015年第3期24卷 264-270页

作者： Ramasamy Chandrasekaran Jesús Palma Marc Anderson Electrochemical Processes Unit Instituto IMDEA Energ?a3 Avda.Ramón de la SagraParque Tecnologico de Móstoles

Herein,we have presented a supercapacitor based on carbide derived carbon（CDC） electrode with natural graphite（NG） addition.The capacitor was analyzed at 22°C by cyclic voltammetry,galvanostatic charge-discharge and impedance techniques using a 0.5 mol/L of magnesium（II）bis（trifluoro methanesulfonyl） imide（Mg TFSI） in ethylene carbonate-propylene carbonate（EC ：PC = 1 ：1,v/v） as electrolyte.The results conclude that the CDC cell enhancements have been proven by the composite electrode（5%–30% NG to CDC） especially on the cell efficiency and voltage i.e.,the CDC cell around 2.5 V limit was improved.An obtainable specific capacitance,real power and energy density are 15 F g-1,1.2 k W kg-1and 15 Wh kg-1,respectively.

关键词： supercapacitor carbide derived carbon magnesium imide organic electrolyte natural graphite

Comparative tribological behavior of friction composites containing natural graphite and expanded graphite

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Friction 2020年第4期8卷 684-694页

作者： Hongyun JIN Keke ZHOU Zhengjia JI Xiaocong TIAN Ying CHEN Luhua LU Yazhou REN Chunhui XU Shanshan DUAN Jiangyu LI Shu-en HOU Faculty of Materials Science and Chemistry China University of GeosciencesWuhan 430074China Department of Mechanical Engineering University of WashingtonSeattleWA 98195-2600USA

In this study, expanded graphite and natural graphite were introduced into resin-based friction materials, and the tribological behavior of the composites was investigated. The tribo-performance of the two friction composites was evaluated using a constant speed friction tester. The results showed that the expanded graphite composite (EGC) displayed better lubricity in both the fading and the recovery processes. The wear rate of the EGC decreased by 22.43%more than that of the natural graphite composite (NGC). In the fading process, and the EGC enhanced the stability of the coefficient of friction. The recovery maintenance rate of the NGC was 4.66% higher than that of the EGC. It can be concluded that expanded graphite plays an important role in the formation of a stable contact plateau and can effectively reduce the wear.

关键词： natural graphite expanded graphite tribological behavior wear mechanism

Design and 3D Printing of Interdigitated Electrode Structures for High-performance Full Lithium-ion Battery

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2022年第4期1卷 112-120页

作者： Kun Xu Ning Zhao Yide Li Pei Wang Zhiyuan Liu Zhangwei Chen Jun Shen Changyong Liu Additive Manufacturing Institute College of Mechatronics&Control EngineeringShenzhen UniversityShenzhen518060China Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robots College of Mechatronics&Control EngineeringShenzhen UniversityShenzhen518060China

The tradeoff between energy and power densities is a critical challenge for commercial tape-cast lithium-ion batteries(LIBs).In this study,three-dimensional(3D)LIBs with interdigitated electrode structures are designed and fabricated via 3D printing to overcome this tradeoff.The evolution of battery design from tape-cast thin planar electrodes to interdigitated 3D electrodes is discussed.Numerical simulations based on COMSOL Multiphysics are performed to elucidate the advantages of interdigitated battery design.Interdigitated LIBs composed of comb-like 3D high-voltage LiCoO2(HV-LCO)cathodes and comb-like 3D natural graphite anodes are fabricated via 3D printing.Additionally,printable HV-LCO inks with appropriate rheological properties are developed for 3D printing.HV-LCO half-cells with Li foil as the counter electrode and an interdigitated full battery with NG anodes as the counter electrode are assembled to test the electrochemical performance.The results show that interdigitated full batteries fabricated via 3D printing offer high specific capacities and stable cycling performance.Full batteries with an electrode thickness of 882µm can achieve a high areal capacity of 5.88 mAh·cm−2@0.1 C,an areal energy density of 41.4 J·cm−2,and an areal power density of 41.0 mW·cm−2@1.0 C,which are approximately 10 times the values afforded by conventional tape-cast thin batteries.

关键词： 3D printing High voltage LiCoO_(2) natural graphite Full lithium-ion batteries

Influence of particle structure on electrochemical character of composite graphite

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Journal of University of Science and Technology Beijing 2003年第1期10卷 61-64页

作者： Cuiwei Du Yujuan Zhao 等 TheCenterofCorrosionandProtection UniversityofScienceandTechnologyBeijingBeijing100083China SolidStateIonicLaboratory UniversityofScienceandTechnologyBeijingBeijing100083China

The natural graphite has been used as the anode material for Lithium-Ion batteries, because of its low cost, chemical stability and excellent reversibility for Li+ insertion. However, the slow diffusion rate of lithium ion and poor compatibility with electrolyte solutions make it difficult to use in some conditions. In order to solve these problems, an epoxy-coke/graphite composite has been manufactured. The particle of composite carbonaceous material coated on non-graphitizable (hard) carbon matrix. Due to the disordered structure, the diffusion rate of lithium species in the non-graphitzable carbon is remarkably fast and less anisotropic. The process for preparing a composite carbon powder provides a promising new anode material with superior electrochemical properties for Li-ion batteries. The unique structure of epoxy-coke/graphite composite electrodes results in much better kinetics, also better recharge ability and initial charge/discharge efficiency.

关键词： lithium-ion batteries negative materials natural graphite structure model

A novel graphite/phenolic resin bipolar plate modified by doping carbon fibers for the application of proton exchange membrane fuel cells

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Progress in natural Science:Materials International 2020年第6期30卷 876-881页

作者： Bo Lv Zhigang Shao Liang He Yong Gou Shucheng Sun Fuel Cell System and Engineering Laboratory Key Laboratory of Fuel Cells & Hybrid Power Sources Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

In this study, the carbon fibers treated by three methods were selected as a reinforcement to investigate the influence on the properties of composite bipolar plates. The properties and microstructure of the composite bipolar plate were characterized by the four-point probe, universal test machine, contact angle tester and scanning electron microscopy. The optimum treatment methods and the fiber content were analysed. The results showed that the carbon fibers treated by Fenton reagent for 2 h exhibited the best performance, which could improve the electrical conductivity and the flexural strength for composite bipolar plate. Besides, the optimal content content of carbon fibers treated by Fenton reagent was 4%. The maximum power density of the PEMFC with the composite bipolar plates could reach 662.75 m W cmin H-air conditions. Therefore, the phenolic resin/graphite composite bipolar plate modified by doping carbon fibers was a promising candidate for bipolar plate materials for PEMFC.

关键词： PEM fuel Cell natural graphite Phenolic resin Composite bipolar plate