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磷酸改性天然石墨负极材料的设计、制备及性能研究
引用本文:刘华靖,李奕怀,吴敏昌,乔永民,靳海英,王利军.磷酸改性天然石墨负极材料的设计、制备及性能研究[J].上海第二工业大学学报,2014(3):188-192.
作者姓名:刘华靖  李奕怀  吴敏昌  乔永民  靳海英  王利军
作者单位:[1]上海第二工业大学城市建设与环境工程学院,上海201209; [2]上海杉杉科技有限公司,上海201209
基金项目:上海市教育委员会科研创新项目(N0.12ZZ195); 国家自然科学基金(No.51174274,No.21101105); 上海市曙光计划(No.09SG54)资助
摘    要:利用石墨层间化合物技术处理天然石墨,使磷酸进入到石墨层表面,并在石墨表面包覆一层有机胺中间体,然后在惰性气氛下进行高温处理。研究发现,所得材料在保持石墨原始结构不被破坏的情况下,增大了石墨的层间距,为锂离子的嵌入和脱出拓宽了通道,也为材料在充放电过程中预留了膨胀体积。将这种材料用于锂离子电池负极材料、电化学性能测试表明或改性材料中可具有更小的不可逆容量和更高的充放电效率,并且在大电流充放电情况下,倍率性能得到了提升。

关 键 词:天然石墨  材料改性  石墨层间化合物  磷酸  石墨层间距

The Design,Synthesis and Electrochemical Performance of the Modification of Natural Graphite Anode Materials by H3PO4
Affiliation:LIU Hua-jing, LI Yi-huai, WU Min-chang, QIAO Yong-min, JIN Hai-ying, WANG Li-jun (1. School of Urban Development and Environment Engineering, Shanghai Second Polytechnic University, Shanghai 201209, P. R. China; 2. Shanghai Shanshan Technology Co., Ltd., Shanghai 201209, P. R. China)
Abstract:The natural graphite was processed with technology of graphite intercalation componds(GICs), made sure that phosphoric acid has got into the surface of graphite layer, and coated with a layer of organic amine intermediates on the surface of graphite. Then the graphite was processed by high-temperature treatment under the inert atmosphere. The results showed that the interlayer space of the samples was increased and primary structure of the samples was retained which broadened the channels of Li+transference and also reserved the room for expanding of the samples. Using this sample as anode material of lithium-ion batteries, H3PO4 modified sample has got smaller irreversible capacity and higher coulombic effciency as well as the rate capacility.
Keywords:natural graphite  material modification  graphite intercalation compound  H3PO4  graphite interlayer sapce
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