Preparation method of nickel-cobalt-manganese ternary material, nickel-cobalt-manganese ternary material, lithium-ion battery cathode material, and lithium-ion battery
A technology for lithium-ion batteries and ternary materials, which is applied in the preparation of nickel-cobalt-manganese ternary materials and the field of lithium-ion battery cathode materials, and can solve problems such as the decline in the cycle performance of nickel-cobalt-manganese ternary materials
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[0042] In the first aspect, in at least one embodiment, a method for preparing a nickel-cobalt-manganese ternary material is provided, comprising the steps of: ball milling, drying and secondary sintering of the ternary material precursor and lithium source blend in sequence Sintering to obtain a nickel-cobalt-manganese ternary material.
[0043] Preferably, the drying includes but is not limited to spray drying; it can be understood that a drying method capable of achieving the same effect can also be used.
[0044] The preparation method of the nickel-cobalt lithium manganese oxide ternary material with controllable particle size, through the mixed sintering of the ternary material precursor and the lithium source, ball milling, drying and secondary sintering, reduces the need for production of the ternary material precursor. The condition requirements of various factors, especially the ball milling and drying granulation process, can adjust the particle size distribution of n...
Embodiment 1
[0100] A preparation method of nickel-cobalt-manganese ternary material, comprising the following steps:
[0101] 1) NiCl 2 ·6H 2 O, CoCl 2 ·6H 2 O and MnCl 2 4H 2 O is prepared into a mixed salt solution, wherein the concentrations of the three are 150g / L, 150g / L and 125g / L respectively;
[0102] 2) Take 2mol / L sodium hydroxide solution as the alkali solution; take 2mol / L ammonia water as the complexing agent, mix and stir the mixed salt solution, alkali solution and ammonia water for reaction, control the reaction temperature to be about 45°C, and the pH to be 11.5, the stirring speed is 300r / min, after the reaction is completed, filter the reaction product, wash with deionization for 3 times, and wash with absolute ethanol for 2 times to obtain a ternary material precursor;
[0103] 3) Sintering: Put the mixture of the ternary material precursor and Li in the lithium source at a molar ratio of 1:1.04 in a high-temperature roller kiln, and raise the temperature to 500°...
Embodiment 2
[0126] A preparation method of nickel-cobalt-manganese ternary material, comprising the following steps:
[0127] 1) NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O is prepared into a mixed salt solution, wherein the concentrations of the three are 180g / L, 160g / L and 140g / L respectively;
[0128] 2) Take 4mol / L sodium hydroxide solution as the alkali solution; take 4mol / L ammonia water as the complexing agent, mix and stir the mixed salt solution, alkali solution and ammonia water to react, control the reaction temperature to be about 40°C, and the pH to be 12. The stirring speed is 500r / min. After the reaction, the reaction product is filtered, deionized and washed 3 times, and washed with absolute ethanol 2 times to obtain a ternary material precursor;
[0129] 3) Sintering: Put the mixture of the ternary material precursor and Li in the lithium source at a molar ratio of 1:1.07 in a high-temperature roller kiln, and raise the temperature to 600°C at a rate of 4°C / min...
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