China Nonferrous Metallurgy

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 7h, the system pH value of 11.0, the stirring rate of 1100r/min, and the caustic concentration of 170g/L; The ternary material precursor prepared by the seed template process may has a tap density in excess of 2.1g/cm³, and a D50 range of 3~6μm, 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.