A method for simultaneous regulation of surface structure and chemical composition of layered lithium-rich cathode materials

A lithium-rich cathode material and surface structure technology, applied in structural parts, electrochemical generators, battery electrodes, etc., can solve the problems of excellent comprehensive electrochemical performance, inability to obtain, etc., achieve excellent electrochemical performance, good application prospects, Effect of stabilizing cycle life
CN108767254BActive Publication Date: 2020-12-15XIANGTAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIANGTAN UNIV
Publication Date
2020-12-15

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Abstract

The invention discloses a synchronous control method for a surface structure and a chemical composition of a layered lithium-rich cathode material, wherein the cathode material has the general formulaof xLi2MnO3.(1-x)LiMO2 or Li1+x[M]1-xO2, and M is one or a plurality of Mn, Co, and Ni. The method comprises the steps of: 1) placing a carbonate precursor in a treating agent solution for surface treatment; and 2) burning the treated carbonate precursor into an oxide for uniform mixing with the lithium source compound, and obtaining a surface-modified layered lithium-rich cathode material by high temperature calcination. The main body of the material is of a layered structure with a spinel phase on the surface, a transitional mixed phase is provided between the layered structure and the spinel phase, and the chemical composition of the surface is different from that of the host. The invention has simple and easy operation, and is capable of imparting excellent electrochemical performances such as rapid lithium ion diffusion channel, stable cycle life and weak voltage decay of the positive electrode material.
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Description

technical field

[0001] The invention relates to a method for synchronous regulation and control of the surface structure and chemical composition of a layered lithium-rich positive electrode material, which belongs to the field of energy materials and electrochemistry. Background technique

[0002] Lithium-ion battery has become the most widely developed and applied power system due to its advantages of large specific energy, high working voltage, low self-discharge rate and light weight. However, the current energy density, power characteristics, safety performance and cost issues of lithium-ion batteries still restrict its further development, especially it is difficult to meet the application requirements of high-energy-density power supplies for strategic emerging industries such as electric vehicles. The energy density of lithium-ion batteries mainly depends on the positive electrode material, and improving the specific capacity or working voltage of the positive electr...

Claims

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