Method for eliminating residual lithium and preparing lithium ion conductor-coated high-nickel ternary positive electrode material

Abstract

The invention belongs to the technical field of a lithium ion battery material, specifically a method for eliminating residual lithium and preparing a lithium ion conductor-coated high-nickel ternarypositive electrode material. According to the method, a high-nickel ternary positive electrode material and a lithium ion conductor precursor are subjected to ball milling in a ball mill based on a certain proportion; and the mixture obtained by above-mentioned processing is calcined in the air to obtain a lithium ion battery high-nickel ternary positive electrode modified material. The method issimple in process, convenient to operate, and capable of avoiding adverse influence from water content introduction to the high-nickel ternary material by adopting the dry ball milling mode; and meanwhile, a lithium ion conductor coating layer is formed by adopting surface residual lithium in-situ processing, so that the diffusion rate of lithium ions is accelerated, interface stability is improved, and excellent electrochemical performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a method for preparing a high-nickel ternary cathode material coated with a lithium-ion conductor. Background technique [0002] In today's world where resources are increasingly depleted, it is particularly important to develop green and clean energy. Lithium-ion batteries have attracted the attention of scientific research and commercial development due to their outstanding advantages such as high energy density, high working voltage, good cycle performance, small self-discharge, small size, and no memory effect. Its application field has rapidly expanded from the initial mobile communication to various aspects of entertainment, military, aerospace, medical treatment, etc., including various portable electronic products, and is developing into large and medium-sized energy storage equipment and power supply. This is of great significance to re...

AI Technical Summary

Problems solved by technology

However, the residual lithium on the surface of the high-nickel ternary material is relatively high, which affects the processing performance of the pole piece

In addition, the residual lithium on the surface accelerates the decomposition of the electrolyte, reduces the stability of the interface, and leads to poor electrochemical performance.

Under the condition of high temperature and high pressure, the battery is prone to unsafe problems such as flatulence and explosion, which greatly limits the practical application of high-nickel ternary cathode materials

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