锂离子电池正极材料LiNi_(0.5)Co_(0.5)O_2的制备及性能  

Synthesis and properties of LiNi_0.5Co_0.5O_2 cathode materials for lithium ion batteries

作　　者：蔡振平[1] 刘人敏[1] 吴国良[1] 金维华[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《电池》2002年第z1期58-60,共3页Battery Bimonthly

基　　金：国家863基金资助项目

摘　　要：LiNixCo1-xO2（0≤x≤1）系是一种很有希望的新型的锂离子电池电极材料。以Li2CO3,NiO,Co3O4为原料,经过造粒的预处理,固相反应合成了锂离子电池正极材料LiNi0.5Co0.5O2。研究了不同的合成条件对产物结构、性能的影响。结果表明,反应温度、时间、Li/（Ni+Co）摩尔比等因素对产物的结构、电性能有一定的为响。XRD分析表明合成的产物LiNi0.5Co0.5O2结晶良好,具有规整的α-NaFeO2层状结构的。充放电测试表明在优化条件下合成的LiNi0.5Co0.5O2首次充电容量为170.1mAh/g,放电容量为157.4mAh/g,20次循环后保持初始容量的92％,循环稳定性良好。以MCMB为阳极材料,合成产物为阴极材料,组装成18650型锂离子电池,性能与LiCoO2相当。LiNixCo1-xO2 was a very promising cathode materials for lithium ion battery.The cathode materials LiNi0.5Co0.5 O2 for lithium ion battery were synthesized by using Li2CO3, Co3O4 and NiO as precausors in appropriate ratio in air by solid phase. Different synthesis conditions were investigated and the structure of the product were tested. The results showed that the synthesis temperature, reaction time, Li/(Ni + Co)mole ratio exerted important effects on the structure and electrochemical performance. The XRD results showed that the synthesized products were highly crystallized LiNi0.5Co0.5O2 with order α-NaFeO2 layered structure. Electrochemical tests proved that LiNi0.5 Co0.5O2 cathode powder synthesized under the optium conditions had an initial charge capacity of 170. 1mAh/g and discharge capacity of 157.4mAh/g, and retention of more than 92% after 20 cycles, indicating a good cycle stability. The performance of 18650 type lithium-ion batteries using LiNi0.5 Co0.5 O2 as cathode materials and MCMB as the anode materials was comparable to those with LiCoC2 cathode.

关 键 词：锂离子电池 正极材料 LiNi0.5Co0.5O2 

分 类 号：TM910[电气工程—电力电子与电力传动]