包覆型锂离子正极材料LiNi_(0.9)Mn_(0.03)Co_(0.07)O_2的合成与性能  

Synthesis and Properties of LiNi_(0.9)Mn_(0.03)Co_(0.07)O_2 as Coating Cathode Materials

作　　者：邓新荣[1] 胡国荣[1] 彭忠东[1] 肖政伟[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《稀有金属》2007年第4期491-496,共6页Chinese Journal of Rare Metals

基　　金：湖南省自然科学基金(04JJ3088)资助项目

摘　　要：采用复合包覆法合成了锂离子正极材料LiNi0.9Mn0.03Co0.07O2,前驱体的合成过程条件与最终包覆的材料性能有关。讨论了包覆沉淀反应过程中沉淀剂、pH值、搅拌速度和氨水浓度对电化学性能的影响。同时还考察了煅烧制度对材料电化学性能的影响。结果表明:在优化条件下Co,Mn均匀包覆在β-Ni(OH)2表面上;合成的正极材料LiNi0.9Mn0.03Co0.07O2在电压范围3～4.3V,电流密度30mA.g-1下,第二次放电容量为194mAh.g-1,50次循环后容量仍保持为189mAh.g-1,材料循环性能稳定。LiNi0.9Mn0.03Co0.07O2 powders were synthesized by co-coating method.The properties of LiNi0.9Mn0.03Co0.07O2 were significantly dependent on synthetic conditions,such as precipitation agent,pH,stirring speed,ect.The calcination condition was studied.The results showed that under optimum condition the sample was coated by homogeneously;the second discharge capacity of the materials was 194 mAh·g^-1,and the discharge capacity remained 189 mAh·g^-1 after 50 cycles at 3～4.3 V and current density of 30 mA·g^-1.The cycle performance of the sample was very stable.

关 键 词：锂离子电池 包覆 正极材料 循环稳定性 

分 类 号：TM912.9[电气工程—电力电子与电力传动] O614.111[理学—无机化学]