LiCoO_2正极材料的溶胶-凝胶法合成及其电化学性能研究  

SYNTHESIS BY A SOL - GEL ROUTE AND CHARACTERIZATION OF LiCoO_2 CATHODE MATERIALS

作　　者：刘景[1] 温兆银[1] 顾中华[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：《硅酸盐学报》2002年第z1期4-7,共4页Journal of The Chinese Ceramic Society

摘　　要：采用溶胶-凝胶法制备了锂离子电池的活性正极材料LiCoO2超细粉体。实验表明:合成的LiCoO2粉体结晶良好,层状结构发育完善,平均粒径为300 nm,而且粒径分布窄,比表面积大。电池充放电测试表明:正极的电化学性能与LiCoO2粉体的合成温度有关,其中700℃合成得到的LiCoO2正极材料具有最优的电化学性能,其首次放电比容量高达141 mA·h/g,30次循环后其可逆比容量仍高达120 mAh/g,容量损失为14.89％。The ultrafine LiCoO2 powder for lithium ion batteries was prepared at low temperatures by calcining a dry gel at different temperatures. The experiments show that the synthesized product is good in crystallinity and layer structure. The average particle size of the powder calcined at 700 C is 300 nm, and it is in a sharp range. The charge and discharge cycling of the cells containing the synthesized oxide as the cathode materials in conjunction with lithium metals and a non-aqueous electrolyte indicate that LiCoO2 treated at 700 XI exhibits excellent performances in terms of its high first discharge capacity (141 mA-h/g)and cycling stability in 30 cycles (capacity loss of 14.89% ).

关 键 词：锂钴氧化物正极材料 溶胶-凝胶 锂离子电池 

分 类 号：TB34[一般工业技术—材料科学与工程]