Li_aNi_(0.75)Co_(0.25)O_2的共沉淀法合成及其电化学性质研究  

Cyclic performance of Li_aNi_(0.75)Co_(0.25)O_2 cathode materials prepared by the co-precipitation synthesis method

作　　者：黄元乔[1] 郭文勇[1] 李道聪[1] 甘雄 彭正合[1] 周运鸿[1] 

机构地区：[1]武汉大学化学与分子科学学院

出　　处：《功能材料》2005年第4期586-588,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(29771025);国家九五重点攻关资助项目(29833090)

摘　　要：用两种方法合成了锂镍钴复合氧化物电极材料LiaNi0.75 Co0.25 O2,由XRD、SEM 表征及电化学实验方法研究了合成方法对材料的电化学性能的影响。结果表明采用共沉淀法预处理后合成的电极材料具有较好的电化学性能,首次充放电容量可达到198.8和168.7mAh/g,并且具有良好的循环稳定性,循环30次后容量损失9.3%。Nickel-based complex oxide LiaNi0.75Co0.25O2 was prepared with two different methods. It was studied that effect of preparation methods of LiaNi0.75Co0.25O2 cathode materials on their chemical structure and performance. XRD, SEM and electrochemical testing investigated its physical and electrochemical properties. The results demonstrated that prepared cathode materials by the improved solid-state reaction synthesis method using coprecipitated Co-Ni hydroxides had an inferior cyclic performance and a higher discharge capacity. Its discharge capacity was as high as 168.7 mAh/g at the fist cycle. Loss was only 9.3% at the 30th cycle.

关 键 词：锂离子电池 电极材料 锂镍钴氧化物 共沉淀 

分 类 号：TM911[电气工程—电力电子与电力传动]