无粘结剂三维石墨烯-硫正极的电化学性能研究
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摘要
为提高电极中硫的负载量,采用水热法和热处理法制备了锂硫电池用无粘结剂三维石墨烯-硫正极材料,用比表面积测试仪、电子扫描电镜、电化学工作站以及电池测试系统对电极的比表面积、微观表面形貌和电化学性能进行了表征.结果表明:所制备的无粘结剂三维石墨烯-硫电极的最高放电比容量为517.3 mAh/g,50次循环后,放电比容量仍能保持在448.9 mAh/g,表现出较高的比容量和良好的循环性能.
In order to increase the mass loading of sulfur,binder-free 3D graphene-sulfur( 3D-GS) cathode for lithium-sulfur batteries was prepared using hydrothermal and heat treatment methods. The specific surface area,microstructure,morphology and electrochemical properties were characterized by specific surface area analyzer,scanning electron microscope,electrochemical workstation and battery test system. As a result,the as-prepared binder-free 3D-GS cathode could deliver a high specific capacity of 517. 3 mAh /g,and can maintain 448. 9 mAh /g after 50 charge-discharge cycles,showing high specific capacity and well cycle stability.
In order to increase the mass loading of sulfur,binder-free 3D graphene-sulfur( 3D-GS) cathode for lithium-sulfur batteries was prepared using hydrothermal and heat treatment methods. The specific surface area,microstructure,morphology and electrochemical properties were characterized by specific surface area analyzer,scanning electron microscope,electrochemical workstation and battery test system. As a result,the as-prepared binder-free 3D-GS cathode could deliver a high specific capacity of 517. 3 mAh /g,and can maintain 448. 9 mAh /g after 50 charge-discharge cycles,showing high specific capacity and well cycle stability.
引文
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[3]BARHAMADI M,KAPOOR A,WEN C.A Review on Li-S Batteries as a high efficiency rechargeable lithium battery[J].Journal of the Electrochemical Society,2013,160(8):A1256-A1263.
[4]QU Chaoqun,WEI Yingjin,JIANG Tao.Research progress in Li3V2(PO4)3as polyanion-type cathode materials for lithium-ion batteries[J].Interinational Journal of Inorganic Materials,2012,27(6):561-567.
[5]XU Bo,QIAN Anna,WANG Ziying,et al.Recent progress in cathode materials research for advanced lithium ion batteries[J].Materials Science&Engineering R,2012,73(5-6):51-65.
[6]OH Y,NAM S,WI S,et al.Review paper:nanoscale interface control for high-performance Li-Ion batteries[J].Electronic Materials Letters,2012,8(2):91-105.
[7]HAN K,SHEN J M,HAYNER C M,et al.Li2Sreduced graphene oxide nanocomposites as cathode material for lithium sulfur batteries[J].Journal of Power Sources,2014,251:331-337.
[8]ZHOU Xiangyang,XIE Jing,YANG Juan,et al.Improving the performance of lithium-sulfur batteries by graphene coating[J].Journal of Power Sources,2013,243:993-1000.
[9]ZHOU Weidong,CHEN Hao,YU Yingchao,et al.Amylopectin wrapped graphene oxide/sulfur for improved cyclability of lithium-sulfur battery[J].ACS Nano,2013,7(10):8801-8808.
[10]ZHOU Guangming,YIN Lichang,WANG Dawei,et al.Fibrous hybrid of graphene and sulfur nanocrystals for high-performance lithium-sulfur batteries[J].ACS Nano,2013,7(6):5367-5375.
[11]ZHENG Guangyuan,ZHANG Qianfan,CHA J J,et al.Amphiphilic surface modification of hollow carbon nanofibers for improved cycle life of lithium sulfur batteries[J].Nano Letters,2013,13(3):1265-1270.
[12]TANG Qiwei,SHAN Zhongqiang,WANG Li,et al.Nafion coated sulfur-carbon electrode for high performance lithium-sulfur batteries[J].Journal of Power Sources,2013,246:253-259.
[13]TAN Hanbo,WANG Shengping,TAO Du,et al.Acetylene black/sulfur composites synthesized by a solution evaporation concentration crystallization method and their electrochemical properties for Li/S batteries[J].Energies,2013,6(7):3466-3480.
[14]MIAO Lixiao,WANG Weikun,WANG Mengjia,et al.Sulfur composite cathode for lithium-sulfur batteries[J].Progress in Chemistry,2013,25(11):1867-1875.
[15]JIN Jun,WEN Zhaoyin,MA Guoqiang,et al.Flexible self-supporting graphene-sulfur paper for lithium sulfur batteries[J].RSC Advances,2013,3(8):2558-2560.
[16]MA Guoqiang,WEN Zhaoyin,JIN Jun,et al.Enhanced performance of lithium sulfur battery with polypyrrole warped mesoporous carbon/sulfur composite[J].Journal of Power Sources,2014,254:353-359.
[17]LEE J T,ZHAO Y Y,KIM H,et al.Sulfur infiltrated activated carbon cathodes for lithium sulfur cells:The combined effects of pore size distribution and electrolyte molarity[J].Journal of Power Sources,2014,248:752-761.
[18]DORNBUSCH DA,HILTON R,GORDON MJ,et al.Effects of carbon surface area on performance of lithium sulfur battery cathodes[J].Journal of Industrial and Engineering Chemistry,2013,19(6):1968-1972.
[19]AHN W,KIM KM,JUNG KN,et al.Synthesis and electrochemical properties of a sulfur-multi walled carbon nanotubes composite as a cathode material for lithium sulfur batteries[J].Journal of Power Sources,2012,202:394-399.
[20]ZHAO Jinping,PEI Songfeng,REN Wencai,et al.Efficient preparation of large-area graphene oxide sheets for transparent conductive films[J].ACS Nano,2010 4,5245-5252.
[21]LU Songtao,CHENG Yingwen,WU Xiaohong,et al.Significantly improved long-cycle stability in high-rate Li-S batteries enabled by coaxial graphene wrapping over sulfur-coated carbon nanofibers[J].Nano Letters,2013,13:2485-2489.