2% LiMn_2O_4对LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2电化学性能的影响  

Effects of 2% LiMn_2O_4 mixing on electrochemical performance of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 cathode material

作　　者：何丽琼[1] 刘慧勇[1] 

机构地区：[1]福州大学化学化工学院,福建福州350108

出　　处：《电源技术》2015年第3期461-463,共3页Chinese Journal of Power Sources

基　　金：福建省自然科学基金计划项目(2012J01038)

摘　　要：将层状的LiNi1/3Co1/3Mn1/3O2锂离子电池正极材料与尖晶石型的LiMn2O4按质量比为2∶98混合烧结,采用X射线衍射（XRD）、循环伏安法（CV）、交流阻抗（EIS）以及充放电测试研究LiMn2O4对LiNi1/3Co1/3Mn1/3O2电化学性能的影响。研究表明混合LiMn2O4有利于提高LiNi1/3Co1/3Mn1/3O2正极材料的首次库仑效率、循环性能和倍率性能,在3.0~4.3 V以1 C循环,首次放电比容量和库仑效率分别为150.3 m Ah/g和85.5%,循环50次后容量保持率为88.9%;在5 C下充放电仍保持136.2 m Ah/g。循环伏安与交流阻抗测试表明混合2%（质量分数）LiMn2O4可以提升材料的可逆性和放电容量,降低电荷转移电阻。The product was mixed with 98% of layered LiNi1/3Co1/3Mn1/3O2 and 2% of spinel LiMn2O4. Effects of LiMn2O4 mixing on the electrochemical performance of LiNi1/3Co1/3Mn1/3O2 were studied by XRD, electrochemical impedance spectroscopy（EIS）, cyclic vohammetry（CV） and charge-discharge tests. The mixture of LiNi1/3Co1/3Mn1/3O2 and LiMn2O4 cathode material showed a better initial coulombic efficiency, rate capability, and cycling performance than that of pure LiNi1/3Co1/3Mn1/3O2. Within the potential area of 3.0-4.3 V, at the rate of 1 C, the initial specific discharge capacity and coulombic efficiency were 150.3 m Ah/g and 85.5%, respectively, the capacity retention rate was 88.9%after 50 cycles. The initial specific discharge capacity maintained 136.2 m Ah/g at the rate of 5.0 C. The electrochemical impedance spectroscopy（EIS） and cyclic vohammetry（CV） results indicate that the reversibility,discharge capacity were improved and the charge-transfer resistance was decreased by the mixed-LiMn2O4.

关 键 词：LINI1/3CO1/3MN1/3O2 LIMN2O4 锂离子电池 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]