晶种模板法共沉淀工艺制备Ni-Co-Mn三元材料前驱体

Preparation of Ni-Co-Mn ternary material precursors by eutectic template co-precipitation process

三元材料前驱体的物理性质受到氢氧化物沉淀反应过程中各工艺参数的影响,包括氨水浓度、反应温度、反应过程pH值、反应时间、搅拌速度等。本文在传统氢氧化物共沉淀法制备三元正极材料前驱体的工艺基础上创新性地采用了晶种模板法,并对共沉淀反应的较佳工艺参数进行了分析,得到如下结论:采用一次沉淀法获得的共沉淀反应最佳工艺参数为反应温度50℃、反应时间7 h、体系pH值11.0、搅拌速度1 100 r/min、碱浓度170 g/L;以晶种模板法制备的三元材料前驱体振实密度可以超过2.1 g/cm^(4),D50范围为3~6μm,比目前市售产品的颗粒更加均匀,更趋于球型,比表面积更小,更适于制备单晶三元正极材料。

The physical properties of the ternary material precursor are affected by various process parameters during the hydroxide precipitation reaction, including ammonia concentration, reaction temperature, pH value of the reaction process, reaction time, stirring rate, etc. Based on the traditional hydroxide co-precipitation process for preparing precursors for ternary cathode materials, this article innovatively used the seed template method, and conducted an analysis on the preferable process parameters of the co-precipitation reaction to reach the following conclusions: The optimal process parameters of the co-precipitation reaction obtained by one-step precipitation process include the reaction temperature of 50 ℃, the reaction time of 7 h, the system pH value of 11.0, the stirring rate of 1 100 r/min, and the caustic concentration of 170 g/L;The ternary material precursor prepared by the seed template process may has a tap density in excess of 2.1 g/cm^(3), and a D50 range of 3~6 μm, which, when compared with the other products currently sold on the market, is more uniform and more spherical in terms of particle size, and has smaller specific surface area, and is more suitable for use in the preparation of monocrystal ternary cathode materials.