聚偏氟已烯对LiNi_(0.8)Co_(0.2)O_2复合正极性能的影响  

Influence of PVDF on the Properties of LiNi_(0.8)Co_(0.2)O_2 Composite Positive

作　　者：周姣红[1] 李奇[1] 覃宇夏[1] 丁航舟[1] 

机构地区：[1]湖南大学电池与高分子材料研究所,湖南长沙410082

出　　处：《材料科学与工程学报》2006年第5期766-768,共3页Journal of Materials Science and Engineering

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。本文研究了不同质量含量的聚偏氟乙烯对锂离子电池正极电性能的影响。实验结果表明: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190mAh/g,首次充放电效率最高可达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1832mAh,为首次放电容量的97.8%。In the experiment, we used LiNi0.8Co0.2O2 as active materials, carbon black as conductive materials, PVDF as binder, to make electrodes by solution casting. The emphasis of this article is to discuss how the composition of binder PVDF in cathode affected the performance of the cathode. The results show that when the composition of PVDF is 4%, the lithium-ion cell has the best cycling performance which first discharge capacity is 190mAh/g and first coulomb efficiency is 91%. When assembled 18650 cell, its discharge capacity maintains 97.8% （1832mAh） after fifty cycles.

关 键 词：锂镍钴氧 聚偏氟乙烯 循环性能 

分 类 号：TB34[一般工业技术—材料科学与工程] TM910.4[电气工程—电力电子与电力传动]