Method for preparing high-nickel long-cycle single-crystal lithium ion battery positive-pole material

A technology for lithium ion batteries and cathode materials, which is applied in the field of lithium ion power batteries for new energy vehicles, can solve the problems of poor normal temperature and high temperature cycle performance, low compaction density, poor storage capacity, etc., and achieves improved normal temperature and high temperature cycle performance. , uniform coating, good consistency
CN110451585AInactive Publication Date: 2019-11-15ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
Publication Date
2019-11-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preparing a high-nickel long-cycle single-crystal nickel-cobalt-manganese (NCM) lithium ion battery positive-pole material. The preparation method comprises the following steps: (1) mixing a soluble nickel salt, a cobalt salt, a manganese salt, an alkali metal hydroxide and ammonia water, and enabling the mixture to flow into a reaction kettle for constant-temperature coprecipitation to obtain a high-nickel NCM ternary precursor material; (2) uniformly mixing the high-nickel NCM ternary precursor, lithium hydroxide and an additive A in a wet high-speed mixing mode, carrying out drying, then carrying out primary sintering in an oxygen-enriched atmosphere to obtain a spherical high-nickel NCM ternary positive-pole material; (3) carrying out crushing, smashing and sieving to obtain a high-nickel NCM ternary positive-pole material; and (4) carrying out wet mixing and drying on the high-nickel NCM ternary positive-pole material with a coating agent B, carrying out secondary sintering in an oxygen-enriched atmosphere, and carrying out crushing, smashing and sieving to obtain the high-nickel single-crystal NCM lithium ion battery positive-pole material. The positive-pole material prepared by the method has the advantages of high capacity, good cycle performance, high compaction density and the like.
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Description

technical field

[0001] The invention relates to the technical field of lithium-ion power batteries for new energy vehicles, in particular to a method for preparing a high-nickel single-crystal lithium-ion battery cathode material. Background technique

[0002] Lithium-ion power batteries are the core technical link in the development of new energy vehicles, and the quality of positive electrode materials is the most important thing restricting the development of power batteries. With the increase in the mileage of electric vehicles and the gradual reduction of state subsidies, the energy density requirements for power batteries are also getting higher and higher.

[0003] Today, high-capacity, high-voltage, long-cycle, and low-cost cathode materials are the needs of the power battery market. The cathode material has also developed from the initial NCM111 to NCM523, NCM622, and NCM811, NCA. Increasing the nickel content in the positive electrode material while reducing the ...

Claims

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