Multilayer coated structure lithium ion battery positive electrode material preparation method
A lithium-ion battery, multi-layer coating technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of continuous preparation of spherical materials with multi-layer coating structure, and achieve good morphology and coating effect. , The effect of dense product and smooth process flow
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Embodiment 1
[0027] Dissolve nickel sulfate and cobalt sulfate according to the metal molar ratio of 0.80:0.20 to obtain a 2mol / L mixed salt solution (1), mix the mixed salt solution (1), 10.5mol / L ammonia solution, and 10mol / L hydrogen Sodium oxide solution is added into the stirred nucleation reactor at the same time, the reaction time is controlled to be 30h, the pH value of the reaction system solution is 12.3, and the temperature is controlled by water bath heating to 60°C, so that the reacted slurry naturally overflows to the primary reactor In, nickel chloride, cobalt chloride, manganese chloride, magnesium chloride are dissolved according to the ratio of metal molar ratio 0.33:0.33:0.33:0.01 to obtain 2mol / L mixed salt solution (2), the mixed salt solution (2), 10.5mol / L of ammonia water and 10mol / L of sodium hydroxide solution are simultaneously and co-flowed into the stirred primary reactor, and the reaction is carried out under N 2 Under the protection of the atmosphere, the rea...
Embodiment 2
[0029] Add 1.5 mol / L nickel nitrate solution, 8 mol / L sodium hydroxide solution, and 5 mol / L ammonia water into the stirred nucleation reactor at the same time, control the reaction time to 30 hours, and control the pH value of the reaction system solution to 12.6, and control the temperature The temperature is 55°C, and the precipitate naturally overflows into the primary reactor.
[0030] Dissolve nickel nitrate and manganese nitrate according to the metal molar ratio of 0.5:0.5 to obtain a 1.8mol / L mixed salt solution (2), and mix the mixed salt solution (2), 2mol / L ammonium sulfate, and 5mol / L hydroxide Potassium solution is simultaneously and co-flowed into the stirred first-stage reaction kettle, and the reaction is carried out under N 2 Under the protection of atmosphere, the reaction time is controlled to be 20h, the pH value of the reaction system solution is 11.0, the water bath heating temperature is controlled to be 55°C, and a layer of slurry after the reaction na...
Embodiment 3
[0033] Dissolve nickel acetate, cobalt acetate, and manganese acetate according to the metal molar ratio of 0.60:0.20:0.20 to obtain a 2.0mol / L mixed salt solution, 2mol / L sodium carbonate solution, and 2mol / L ammonium carbonate. In the nucleation reactor, the reaction time is controlled to be 5 hours, the pH value of the solution in the reaction system is 8.5, the temperature is controlled to be 45°C, and the reacted slurry is naturally overflowed and discharged into the primary reactor.
[0034]Mix nickel chloride, cobalt chloride and manganese chloride according to the metal molar ratio of 0.50:0.20:0.30 to obtain a 1.5mol / L mixed solution, a 3mol / L ammonium chloride solution, and an 8mol / L sodium hydroxide solution Simultaneously and co-flow into the stirred first-stage reactor, react in N 2 Under the protection of the atmosphere, the reaction time is controlled to be 3 hours, the pH value of the reaction system solution is 11.2, the heating temperature of the water bath i...
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