控制结晶法制备高容量LiNi_(0.8)Co_(0.2)O_2正极材料  

Synthesis of the cathode materials LiNi_(0.8)Co_(0.2)O_2 for Li-ion batteries based on the controlled crystallization method

作　　者：李改变[1] 陈白珍[1] 李若愚[1] 郭炳琨[1] 李义兵[1] 

机构地区：[1]中南大学冶金学院冶金物理化学研究所,湖南长沙410083

出　　处：《电源技术》2006年第7期546-548,共3页Chinese Journal of Power Sources

摘　　要：采用控制结晶法制备高活性和高堆积密度锂离子蓄电池正极材料LiNi0.8Co0.2O2,并研究了控制结晶工艺对前驱体Ni0.8Co0.2(OH)2物理性能和LiNi0.8Co0.2O2电化学性能的影响。实验表明,当pH值为10.5,搅拌速度为600r/min,采用浆上进料时合成LiNi0.8Co0.2O2的首次放电容量达到187mAh/g,循环50次后能保持初始容量的94.1%。Cathode material LiNi0.8Co0.2O2 for lithiumion batteries with higher capacity and higher bulk density was prepared through the controlled crystallization method. The main factors which affected the performance of LiNi0.8Co0.2O2 were further studied. By the experiment, it was showed that the pH value of the reaction was the key factor and stirring speed and the feed-in mode were the important factors. LiNi0.8Co0.2O2prepared had high initial discharge capacity of 187 mAh/g, and after 50 cycles the capacity retention rate was 94.1%.

关 键 词：控制结晶法 锂离子蓄电池 放电容量 堆积密度 

分 类 号：TM912.9[电气工程—电力电子与电力传动]