Coating and modifying method for electrode material of lithium ion battery

Abstract

The invention relates to a coating and modifying method for an electrode material of a lithium ion battery. The coating and modifying method comprises the following steps of (1) dissolving alkylene borofluoride into a solvent to form a solution; (b) adding the electrode material into the solution, heating and evaporating to remove the solvent, and enabling the alkylene borofluoride to be deposited on the surface of the electrode material; and (c) carrying out thermal processing on the product obtained in the step (b) under a vacuum condition or under inert gas protection, wherein the thermal processing is carried out at a temperature of 100-300 DEG C. Therefore, inorganic components are connected and fixed through an organic framework; due to high flexibility of a polymer chain section, a certain degree of expansion and shrinkage of the electrode in the lithium intercalation / deintercalation process can be bearable; the high elasticity and flexibility of the SIE film can be ensured; the lithium consumption in the cyclic process of the electrode can be lowered; and the service life of the battery can be greatly prolonged.

Description

technical field [0001] The invention belongs to the field of lithium battery electrode materials, and relates to a coating modification method of electrode materials, in particular to a coating modification method of lithium ion battery electrode materials. Background technique [0002] Electrode materials are the most critical and core materials of lithium-ion batteries. Modification of electrode materials is an important means to improve the surface and structural stability of electrode materials and develop high-performance and long-life lithium-ion batteries. [0003] Lithium-ion battery electrode materials (especially graphite negative electrode materials, silicon negative electrode materials, high-voltage positive electrode materials, etc.) will undergo a series of reduction decomposition or oxidation decomposition reactions on the electrode and electrolyte phase interface during the electrochemical intercalation and delithiation process, thereby A layer of solid elec...

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Problems solved by technology

[0005] However, the previous research work was mainly to artificially manufacture nano-scale films on the surface of electrode materials to provide materials with certain functions. These methods usually have the problems of high production cost, low output, and difficulty in industrial mass production. There are few reports on functional coating materials that assist growth and stabilize SEI film structure

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