LiNi_(0.9)Co_(0.1)O_2正极材料的EDTA络合法合成及其性能研究  

Synthesis by an EDTA-based Complexation Process and Characterization of LiNi_0.9Co-0.1O_2 Cathode Materials

作　　者：刘景[1] 温兆银[1] 顾中华[1] 张向峰[1] 

机构地区：[1]中国科学院上海硅酸盐研究所功能陶瓷工程与研究中心,上海200050

出　　处：《无机材料学报》2003年第4期813-817,共5页Journal of Inorganic Materials

摘　　要：采用络合法制备了锂离子电池的活性正极材料LiNi_(0.9)Co_(0.1)O_2粉体,实验表明合成的LiNi_(0.9)Co_(0.1)O_2粉体结晶良好,层状结构发育完善。电池充放电测试结果表明,其容量及循环性能与LiNi_(0.9)Co_(0.1)O_2粉体的合成温度有关,其中900℃合成得到的LiNi_(0.9)Co_(0.1)O_2材料具有最好的电化学性能,首次放电比容量高达120.5mAh/g,循环30次后可逆放电比容量仍高达118.8mAh/g,容量损失仅为1.4％。文中对容量退化的原因进行了分析。The layered LiNixCo1-xO2 compound was prepared by calcining a complex precursor at different temperatures. The physical properties of the synthesized cathode materials were discussed on the basis of structural analysis. The charge and discharge cycling of the cells containing the synthesized oxide as the positive electrode in conjunction with lithium metal and employing a non-aqueous electrolyte shows that LiNi0.9Co0.1O2 treated at 900degreesC exhibits the best electro-chemical performance. The first discharge capacity of LiNi0.9Co0.1O2 is 120.5 mAh/g with 30 cycle capacity loss of only 1.4%. The mechanisms of capacity degradation were investigated based on phase and microstructure analyses.

关 键 词：LiNi0.9Co0.1O2 正极材料 络合法 锂离子电池 

分 类 号：TM911[电气工程—电力电子与电力传动]