Ternary positive electrode material precursor and preparation method thereof
A cathode material and precursor technology, which is applied in the field of precursors of ternary cathode materials and their preparation, can solve the problems of little change in the porosity of the precursor shape, poor controllability of the anaerobic environment, and difficulty in commercial application. Achieve the effect of high sphericity, low cost and loose structure
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Embodiment 1
[0045] The precursor synthesis steps are as follows:
[0046] (1) Prepare a mixed salt solution containing nickel sulfate, cobalt sulfate and manganese sulfate according to the molar ratio of nickel, cobalt and manganese metal ions at a ratio of 6:2:2. The three metal ions of nickel, cobalt and manganese in the mixed salt solution The total molar concentration of the solution is 2mol / L; prepare a 4mol / L sodium hydroxide solution; prepare a 6mol / L ammonia solution as a complexing agent.
[0047] (2) Add pure water, sodium hydroxide solution and ammonia solution to the 300L reactor as the bottom liquid, adjust the temperature of the reactor to 55°C, adjust the pH value to 11.32 with sodium hydroxide, and adjust the ammonium ion concentration with ammonia water Be 2g / L, feed nitrogen 3h in the reactor simultaneously, nitrogen flow rate is 10 L / h.
[0048] (3) In the first stage of the synthesis reaction, a peristaltic pump was used to inject mixed salt solution, alkali solution ...
Embodiment 2
[0053] To prepare the ternary precursor, the steps are as follows:
[0054] (1) Prepare a mixed salt solution containing nickel sulfate, cobalt sulfate and manganese sulfate according to the molar ratio of nickel, cobalt and manganese metal ions at a ratio of 6:2:2. The three metal ions of nickel, cobalt and manganese in the mixed salt solution The total molar concentration of the solution is 2mol / L; prepare a 4mol / L sodium hydroxide solution; prepare a 6mol / L ammonia solution as a complexing agent.
[0055] (2) Add pure water, sodium hydroxide solution and ammonia solution to the 300L reactor as the bottom liquid, and at the same time control the temperature of the reactor to 55°C, adjust the pH value to 11.51 with sodium hydroxide, and adjust the ammonium ion with ammonia water Concentration is 6g / L, feeds nitrogen into reactor simultaneously 3h, and nitrogen flow rate is 10 L / h.
[0056] (3) In the first stage of the synthesis reaction, a peristaltic pump was used to injec...
Embodiment 3
[0059] Prepare nickel-cobalt-manganese ternary precursor, the steps include:
[0060] (1) Prepare a mixed salt solution containing nickel sulfate, cobalt sulfate and manganese sulfate according to the molar ratio of nickel, cobalt and manganese metal ions at a ratio of 6:2:2. The three metal ions of nickel, cobalt and manganese in the mixed salt solution The total molar concentration of the solution is 2mol / L; prepare a 4mol / L sodium hydroxide solution; prepare a 6mol / L ammonia solution as a complexing agent.
[0061] (2) Add pure water, sodium hydroxide solution and ammonia solution to the 300L reactor as the bottom liquid, and at the same time control the temperature of the reactor to 55°C, adjust the pH value to 11.51 with sodium hydroxide, and adjust the ammonium ion with ammonia water Concentration is 3g / L, feeds nitrogen into reaction kettle simultaneously 3h, and nitrogen flow rate is 10 L / h.
[0062] (3) In the first stage of the synthesis reaction, a peristaltic pump...
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