Preparation method of concentration gradient distributed lithium, nickel, cobalt, manganese and oxygen ternary lithium battery cathode material
A lithium-nickel-cobalt-manganese-oxygen ternary lithium, concentration gradient technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems affecting the improvement of material cyclability, poor surface lattice stability of materials, and difficulty in battery capacity and cyclability. Taking into account and other issues, to achieve the effect of improving cycle performance and increasing battery capacity
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[0015] The method of the embodiment of the present invention comprises the following steps:
[0016] 1) Nickel sulfate, cobalt sulfate, and manganese sulfate are prepared in 2.1 mol / L solutions in molar ratios of 5:2:3, 8:1:1, and 2:2:6, respectively, numbered 1, 2, and 3, and used respectively. Ammonia complexed to pH 6.6, 6.8, 7.0;
[0017] 2) Prepare 1.8mol / L NaOH+0.4mol / L NH respectively 3 ·H 2 O, 1.8mol / L NaOH+1.8mol / L NH 3 ·H 2 O, 1.8mol / L NaOH+2.2mol / L NH 3 ·H 2 O three solutions, respectively numbered I, II, III;
[0018] 3) Take m liter of solution No. 1, slowly add solution No. 1 dropwise until pH is 11 and continue to mechanically stir, the reaction time is 4 hours, the reaction is carried out in a constant temperature water bath at 50 °C, and N is fed into the process. 2 Protect;
[0019] 4) Add 3 mL of No. 2 solution to the solution after the reaction in the previous step, and slowly add No. 2 solution dropwise until the pH is 11, set the temperature of th...
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