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3～4.3 V,电流密度30 mA·g-1下,第二次放电容量为194 mAh·g-1,50次循环后容量仍保持为189 mAh·g-1,材料循环性能稳定.
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