首页 | 本学科首页   官方微博 | 高级检索  
     

锂在负极材料中的扩散行为对其大倍率充放电性能的影响
引用本文:王红强,李庆余,颜志雄,张安娜,代启发.锂在负极材料中的扩散行为对其大倍率充放电性能的影响[J].应用化工,2007,36(7):646-648,659.
作者姓名:王红强  李庆余  颜志雄  张安娜  代启发
作者单位:广西师范大学,化学化工学院,广西,桂林,541004
基金项目:广西教育厅科研项目;广西师范大学校科研和教改项目
摘    要:采用恒电位阶跃的方法,对锂在锂离子电池负极材料中的扩散系数进行测量,对天然石墨和中间相炭微球两种负极材料进行了大倍率充放电性能测试。结果表明,锂在两种负极材料中的扩散系数是不同的,锂在天然石墨中的扩散系数较小,只有1.90×10-11cm2/s,而锂中间相炭微球中的扩散系数较大,达4.25×10-9cm2/s,扩散系数大,电极的大电流充放电性能好,天然石墨在5 C放电下放电平台升高到0.3 V,放电容量急剧减小,而中间相炭微球在5 C放电下仍能保持0.2 V左右的放电平台,放电容量保持在234 mA.h/g。

关 键 词:恒电位阶跃法  扩散系数  中间相炭微球  负极材料  锂离子电池
文章编号:1671-3206(2007)07-0646-03
修稿时间:2007-05-05

Influence of diffusion of lithium in negative electrodes on their high rate performance
WANG Hong-qiang,LI Qing-yu,YAN Zhi-xiong,ZHANG An-na,DAI Qi-fa.Influence of diffusion of lithium in negative electrodes on their high rate performance[J].Applied chemical industry,2007,36(7):646-648,659.
Authors:WANG Hong-qiang  LI Qing-yu  YAN Zhi-xiong  ZHANG An-na  DAI Qi-fa
Affiliation:School of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin 541004, China
Abstract:The potential step method has been used for measuring the diffusion coefficient of lithium in nature graphite and mesocarbon microbeads(MCMBs).And high rate charge-discharge was presented for the two different materials.The results showed that the diffusion coefficients of lithium in nature graphite and MCMBs are different.The former is 1.90×10-11 cm2/s and the latter is 4.25×10-9 cm2/s.The electrode with higher diffusion coefficient of lithium has better high current charge-discharge performance.The discharge capacity of nature graphite rapidly reduced and its discharge flat raised to 0.3 V.MCMBs have discharge flat of about 0.2 V and discharge capacity of 234 mA·h/g.
Keywords:potential step method  diffusion coefficient  meslcarbon microbeads  negative electrode material  lithium ion battery
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号