Method for preparing positive electrode material of core-shell structure lithium battery by secondary molten salt method

A technology of positive electrode material and core-shell structure, which is applied in the field of secondary molten salt preparation of core-shell structure lithium battery positive electrode material, can solve the problems of poor surface stability, high nickel ternary material capacity and voltage attenuation, etc., to reduce corrosion, Effect of improving long-life cycle performance and alleviating interfacial lattice mismatch
CN109879333BActive Publication Date: 2021-07-27CHANGSHU INSTITUTE OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGSHU INSTITUTE OF TECHNOLOGY
Publication Date
2021-07-27

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Abstract

The invention discloses a high-nickel ternary single crystal, and the chemical formula of the high-nickel ternary single crystal is LiNi x co y mn z o 2 , the invention also discloses a core-shell structure lithium battery cathode material and a preparation method thereof. In the material disclosed by the invention, the core part increases the nickel content (high-nickel ternary material) to increase the battery capacity, and the shell part (low-nickel ternary material) increases the manganese content to improve the structural stability of the material. The core and shell have a similar lattice structure, which can also alleviate the lattice mismatch phenomenon at the interface between the two. The surface coating layer can improve the interface stability of the high-nickel ternary single crystal, reduce the erosion of the electrolyte, and finally effectively reduce the parasitic reaction on the surface of the high-nickel ternary single crystal, and improve the long-life cycle performance of the material.
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Description

technical field

[0001] The invention belongs to the technical field of lithium battery preparation, and in particular relates to a method for preparing a core-shell structure lithium battery cathode material by a secondary molten salt method. Background technique

[0002] At present, LiCoO has been successfully commercialized 2 、LiFePO 4 , LiMn 2 o 4 Lithium battery cathode materials still cannot meet the needs of the market. Layered transition metal oxides with higher specific capacity have attracted attention, among which high-nickel ternary materials (no strict definition, LiNi x co y mn z o 2 , x+y+z=1, usually x≥0.5) The specific capacity can reach 200mAh / g, and the energy density of a single battery can reach 300Wh / kg. The urgent need for batteries. However, high-nickel ternary materials face serious capacity and voltage attenuation problems, which are the key problems that limit their commercialization. Numerous studies have found that the surface stability ...

Claims

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