镍钴锰三元前驱体的制备及性能研究

Preparation and Properties of Nickel Cobalt Manganese Ternary Precursor

研究了采用共沉淀法制备镍钴锰三元前驱体,考察了氨水浓度、体系pH、反应时间、反应温度对所制备前驱体性能指标的影响。结果表明:在氨水浓度1 mol/L,体系pH=12、反应温度55℃、反应温度28 h最佳试验条件下,所制备前驱体产品粒度分布良好,呈均匀的类球形,结晶致密;混锂煅烧后的正极材料在2.8~4.4 V、0.2 C充放电制度下首次放电容量为169.14 mAh/g,首次效率为88.32%。

The preparation of nickel,cobalt and manganese ternary precursors by coprecipitation method was studied.The effects of ammonia concentration,system pH,reaction time and reaction temperature on the properties of the precursors prepared by coprecipitation method were investigated.The results show that under the optimal conditions of ammonia concentration of 1 mol/L,pH=12,reaction temperature of 55℃and reaction temperature of 28 h,the prepared precursor products have good particle size distribution,uniform spheroid shape and dense crystallization.The first discharge capacity of the cathode material after calcination is 169.14 mAh/g and the first efficiency is 88.32%under the charge and discharge system of 2.8~4.4 V and 0.2 C.