High-voltage lithium oil battery positive electrode material with spinel structure and preparation method of high-voltage lithium oil battery positive electrode material

Abstract

The invention relates to a high-voltage lithium oil battery positive electrode material with a spinel structure and a preparation method of the high-voltage lithium oil battery positive electrode material. The chemical general formula of the lithium oil battery positive electrode material is Li[M1aNibM2cMn1.5]O4, wherein a is larger than or equal to 0.025 and smaller than or equal to 0.05, b is larger than or equal to 0.4 and smaller than or equal to 0.45, c is larger than or equal to 0.025 and smaller than or equal to 0.05, and M1 and M2 are one or more of Mg, Zn, Fe, Li, Al, Cr and Co. During preparation, a soluble lithium source, a nickel source, a manganese source, M1 salt and M2 salt are weighed according to mole ratios firstly to prepare gel, the gel is then heated and dried, and the lithium oil battery positive electrode material is obtained after burning is conducted twice and the gel is cooled to the room temperature. The preparation method is simple, steps are easy to operate, the positive electrode material prepared from a lithium-enriched LiNi0.5Mn1.5O4 positive electrode material formed by doping Li and other metal elements is uniform in particle, is of the spinel structure and is high in crystallinity, the material stability is improved, circulation and rate capability of the material can be effectively increased through the introduced doping elements, the nickel content is decreased, the production cost is reduced, and meanwhile pollution to the environment is reduced.

Description

technical field [0001] The invention relates to a high-voltage lithium-ion battery cathode material with a spinel structure and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in various mobile electronic devices and high-energy devices, such as smartphones, notebooks, and electric vehicles, due to their advantages such as large specific energy, low self-discharge, long cycle life, and good safety performance. [0003] Among many cathode materials, LiCoO 2 Successfully commercialized and widely used, cobalt is a relatively scarce and expensive resource and pollutes the environment. Compared to LiCoO 2 , spinel LiMn 2 o 4 The cathode material has the advantages of abundant resources, low cost, no environmental pollution, and good safety performance, and is considered to be the most promising alternative to LiCoO. 2 positive electrode material. However, stud...

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Problems solved by technology

[0005] The purpose of the invention is to solve the problem of existing high voltage spinel LiNi 0.5 mn 1.5 o 4 For the first time, the positive electrode material has the problems of low Coulombic efficiency, poor cycle performance and rate performance, and provides a high-voltage spinel lithium-ion battery positive electrode material with high performance and low cost and its preparation method, and uses Li doping to form lithium-rich Type LiNi 0.5 mn 1.5 o 4 Cathode material with improved chemical performance

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