Lithium ion battery cathode material and preparation method thereof and lithium battery

A technology for lithium ion batteries and cathode materials, applied in the field of materials, can solve the problems of low doping amount, inability to suppress side reactions on the surface of materials, and influence on the electrochemical performance of materials, so as to achieve a simple and easy method of reducing dosage and impact. Effect
CN110767896AInactive Publication Date: 2020-02-07INST OF PHYSICS - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF PHYSICS - CHINESE ACAD OF SCI
Publication Date
2020-02-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a lithium ion battery cathode material and a preparation method thereof and a lithium battery. The lithium ion battery cathode material comprises cathode material particles and an inorganic solid electrolyte membrane covering the outer surface of the cathode material particles; doping elements are distributed on the surface of the cathode material particles from outside toinside to form a gradient solid solution layer, and the concentration of the doping elements in the gradient solid solution layer gradually decreases from the surface to the inside; the doping elements are 4d and 5d metals; the outer surface of the cathode material particles is covered with the inorganic solid electrolyte membrane, the inorganic solid electrolyte membrane is a continuous membranehaving a thickness of 1 to 200 nm, the inorganic solid electrolyte membrane comprises an amorphous phase and a crystalline phase that coexist, and the crystalline grain size is in a range of 1 to 40nm. The lithium ion battery cathode material has the advantages of high electrochemical stability, high voltage resistance, good cycle performance, strong structural stability, high safety, and the like.
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Description

technical field

[0001] The invention relates to the technical field of materials, and more particularly, to a lithium ion battery cathode material, a preparation method thereof, and a lithium battery. Background technique

[0002] Clean and efficient energy storage and conversion technology is an important cornerstone of the development of modern society. As one of the energy storage systems with the highest energy conversion efficiency, secondary batteries have received more and more attention. Among many secondary battery systems, lithium-ion batteries have become the best among secondary batteries because of their advantages such as high energy density, low self-discharge rate, wide operating temperature, long cycle life, environmental friendliness, and no memory effect.

[0003] With the rapid development of consumer electronics, electric vehicles, smart grids and other fields, people have higher expectations and requirements for the energy density of lithium-ion batteri...

Claims

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