Preparation method of fluoride-coated lithium-rich nickel manganese binary material

Abstract

Disclosed is a preparation method of a fluoride-coated lithium-rich nickel manganese binary material. The preparation method comprises the following steps of dissolving soluble nickel salt and soluble manganese salt in deionized water to form a first mixture; dissolving soluble carbonate in the deionized water, and adding ammonium hydroxide to form a second mixture; placing the first mixture and the second mixture into a container, performing mixing at a first preset temperature, performing a reaction for the first time for a first preset time, and then performing washing and drying in sequence to obtain a precursor; uniformly mixing the lithium salt and the precursor to form a third mixture, and performing high-temperature sintering on the third mixture; dissolving soluble aluminum salt and soluble fluorine-containing salt in the deionized water separately to obtain a first solution and a second solution; and uniformly dispersing a lithium-rich nickel manganese binary material in the first solution to obtain a dispersion liquid, adding the second solution to the dispersion liquid under stirring, performing a reaction for the second time for a second preset time at a second preset temperature, performing washing and drying, and performing high-temperature calcination in nitrogen.

Description

【Technical field】 [0001] The invention relates to the technical field of battery cathode materials, in particular to a preparation method of a fluoride-coated lithium-rich nickel-manganese binary material. 【Background technique】 [0002] Lithium-ion batteries have been widely used in various fields of human production and life due to their outstanding advantages such as high energy density, long cycle life, and environmental protection, especially in recent years. development space. In order to meet the requirements of high-performance lithium-ion batteries such as electric vehicles, the cathode materials of lithium-ion batteries must have higher energy density and longer cycle life. Layered lithium-rich cathode materials have become a research hotspot as cathode materials for lithium-ion batteries due to their high voltage platform, high gram capacity, and high energy density. The layered lithium-rich cathode material is one of the currently researched lithium-ion battery...

AI Technical Summary

Problems solved by technology

However, lithium-ion batteries prepared using layered lithium-rich cathode materials as cathode materials also have corresponding deficiencies in charging and discharging at high voltages. For example, the electrolyte of lithium-ion batteries prepared using layered lithium-rich cathode materials as cathode materials has It is easy to be oxidized and decomposed to produce hydrofluoric acid, which will corrode the layered lithium-rich cathode material and seriously affect the electrochemical performance of the lithium-ion battery prepared using the layered lithium-rich cathode material as the cathode material, such as discharge capacity and cycle life.

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