富锂正极材料Li[Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2的合成优化及表征  

Synthesis optimization,characterization and electrochemical performance of Li[Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2 as cathode material of lithium ion battery

作　　者：郑建明[1] 吴晓彪[1] 杨勇[1] 

机构地区：[1]厦门大学固体表面物理化学国家重点实验室化学化工学院化学系,福建厦门361005

出　　处：《电源技术》2011年第10期1188-1192,共5页Chinese Journal of Power Sources

基　　金：深港创新圈合作项目(SG200810200106A)

摘　　要：采用共沉淀法合成锂离子电池用富锂正极材料Li[Li0.2Mn0.54Ni0.13Co0.13]O2。通过X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)和电池充放电测试方法来考察高温烧结时间和烧结温度对所合成材料的结构和性能的影响。结果表明:900℃烧结15 h合成的样品材料具有较好的层状结构和较优越的综合电化学性能;在1.0 C充放电时,首次放电比容量高达181.6 mAh/g(2.0～4.6 V),充放电效率为68.2%,80圈循环后的放电比容量为176.5 mAh/g,具有较高的容量保持率(97.2%);同时,该富锂正极材料表现出较好的倍率性能,在3.0 C充放电时还有148.8 mAh/g的放电比容量。The conditions of sintering time and sintering temperature were optimized to prepare the cathode material Li Li[Li0.2Mn0.54Ni0.13Co0.13]O2 with co-precipitation method. The prepared materials were characterized and tested by means of XRD, SEM and electrochemical measurements. It is found that the material synthesized by sintering at 900℃for 15 h exhibits the best electrochemical performance, including high initial discharge capacity ＆ coulombic efficiency and good cycling stability in the first 80 charge/discharge cycles at 1.0 C rate in comparison with materials synthesized under other conditions. Meanwhile, the material synthesized at the optimized condition also shows good rate capability, delivering high specific discharge capacity of 148.8 mAh/g at 3.0 C.

关 键 词：Li[Li0.2Mn0.54Ni0.13Co0.13]O2 合成优化 共沉淀 富锂材料 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]