LiNi_(0·8)Co_(0·2)O_2正极的电性能  

Study on Electricity Properties of LiNi_(0.8)Co_(0.2)O_2 Positive Electrode

作　　者：周姣红[1] 李奇[1] 叶伟[1] 熊英[1] 曾曦[1] 

机构地区：[1]湖南大学电池与高分子材料研究所,长沙410082

出　　处：《有色金属》2006年第2期26-28,37,共4页Nonferrous Metals

基　　金：国家留学归国科研启动基金资助项目(教外资留2004-527)

摘　　要：以LiNi0.8Co0.2O2为活性物质,炭黑为导电剂,聚偏氟乙烯为粘结剂,采用溶液浇铸法制备锂离子电池正极,研究聚偏氟乙烯含量对锂离子电池正极电性能的影响。结果表明,当正极材料中粘结剂聚偏氟乙烯含量为4%时,所制备的正极片的电性能最佳,首次放电容量为190mA.h.g-1,首次充放电效率达到91%,循环性能良好,进一步组装的18650电池经50次循环后容量为1832mA.h,是首次放电容量的97.8%。The positive electrode of the lithium-ion cell is prepared by liquor casting with LiNi0.8Co0.2O2 as active materials, carbon black as conductive materials, PVDF as binder, and the effect of binder PVDF content on the performance of the cathode is investigated. The results show that the optimal content of PVDF in the lithiumion cell cathode is 4 %, presented by the best cycling performance of 190 mA·h·g^-1 first discharge capacity and 91% first coulomb efficiency. The discharge capacity maintains 97.8% （1832 mA·h） after fifty cycles, while the cathode is assembled in 18650 battery.

关 键 词：无机非金属材料 钴镍酸锂 聚偏氟乙烯 正极材料 

分 类 号：TM910.3[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]