锂离子电池正极材料Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_2的Ag表面修饰  

Silver surface modification of Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_2 cathode material for lithium ion batteries

作　　者：代克化[1] 毛景[1] 翟玉春[1] 其鲁[2] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]北京大学化学与分子工程学院,北京100871

出　　处：《电源技术》2011年第1期22-24,共3页Chinese Journal of Power Sources

摘　　要：采用银镜反应法对Li(Ni1/3Co1/3Mn1/3)O2材料进行了Ag表面修饰。表面元素分布测试表明,Ag均匀分布在Li-(Ni1/3Co1/3Mn1/3)O2颗粒表面。未经表面修饰的材料在C/5、C/2和1C倍率下放电容量分别为168、160、146mAh/g,经过Ag表面修饰的材料在C/5、C/2和1C倍率下放电容量分别为159、149、140mAh/g,容量有所下降。但经过Ag表面修饰后的材料50次循环容量保持率从91.2%提高到97.8%。充电后对材料的DSC测试表明,Ag表面修饰还可以改善材料的安全性能。Li （Ni1/3Co1/3Mn1/3）O2 was modified by silver via a silver mirror reaction.The surface elemental distribution analysis show that silver is uniformly distributed on the surface of Li（Ni1/3Co1/3Mn1/3）O2 particle.The specific discharge capacity of the bared material was 168,160 and 146 mAh/g at C/5,C/2 and 1 C rate,and the specific discharge capacity of the silver modified material was 159,149 and 140 mAh/g at C/5,C/2 and 1 C rate.However,after 50 cycles,the capacity retention of the capacity retention of the silver modified Li（Ni1/3Co1/3Mn1/3）O2 was increased form 91.2% to 97.8%.DSC tests of charged materials suggest that silver modification can improve the security of Li（Ni1/3Co1/3Mn1/3）O2.

关 键 词：锂离子电池 正极材料 LI(NI1/3CO1/3MN1/3)O2 表面修饰 

分 类 号：TM912.9[电气工程—电力电子与电力传动]