高容量正极材料0.08LiCo_(0.75)Al_(0.25)O_2-0.92LiNiO_2的合成与电化学性能研究  

Synthesis and Electrochemical Properties of High-Capacity Cathode Material 0.08LiCo_(0.75)Al_(0.25)O_2-0.92LiNiO_2

作　　者：王茹英[1] 邱天[1] 毛冲[1] 杨文胜[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《电化学》2012年第4期332-336,共5页Journal of Electrochemistry

基　　金：国家自然科学基金项目(No.20971011);新世纪优秀人才计划项目(No.NCET-08-0713);中央高校基本科研业务费项目(No.ZD1004);北京市共建项目专项资助

摘　　要：在恒定pH值下将层状钴铝双羟基复合金属氧化物(CoAl-LDH)均匀包覆在球状Ni(OH)2表面,与LiOH.H2O混合均匀后,经高温煅烧制得钴铝酸锂包覆镍酸锂0.08LiCo0.75Al0.25O2-0.92LiNiO2正极材料.电化学测试表明,0.08LiCo0.75Al0.25O2-0.92LiNiO2正极比容量高,具有良好的倍率性能和循环寿命,其0.1C放电比容量为211 mAh·g-1,0.5C放电比容量为195.6 mAh·g-1,3C放电比容量为161 mAh·g-1,0.5C 30周期循环后容量保持率为93.2%,明显优于LiNiO2和钴酸锂包覆镍酸锂0.08LiCoO2-0.92LiNiO2正极.CoA1-LDH or Co （OH）2 coated spherical Ni （OH）： precursors were obtained via a coprecipitation method at a constant pH. The mixtures of the precursors and LiOH-H： O were annealed at high temperature in O2 atmosphere, and then the cathode materials of 0. 08LiCo0. 75 Al0.25 Oa-0. 92LiNiO2, 0. 08LiCoO2-0.92 LiNiO2 and LiNiO： were synthesized. Effects of the coating layer were also studied. The results showed that the 0.08LiCoo 75Alo 25 024）. 92LiNiO： material possessed the best rate and cycle life performance. The dischar-ging capacities at 0.1 C, 0.5 C and 3 C were 211 mAh·g^-1, 195.6 mAh·g^-1 and 161 mAh·g^-1 respectively, and the capacity retention ratio after 30 cycles at 0.5C was 93.2%. These performances were much better than those of both pure LiNiO： and 0.08LiCoO2-0.92LiNiO2.

关 键 词：锂离子电池 正极材料 LINIO2 LiCo0.75Al0.25O2 包覆 

分 类 号：TM912.9[电气工程—电力电子与电力传动]