A kind of coating method of electrode material and its coating and application

Abstract

The present invention discloses a coating method of an electrode material and a coating thereof, and application of an electrode material. The method comprises the following steps of: (1) putting an electrode material into a solution containing at least three alkynyl compounds for reaction, or, drying slurry comprising the electrode material and then putting the slurry comprising the electrode material to the solution containing the at least three alkynyl compounds for reaction; and (2) performing heat treatment of a reaction product obtained in the step (1) to obtain a carbon-coated electrodematerial. The method provided by the invention achieves carbon coating of various types of electrode materials difficult for carbon coating in the true sense to greatly improve the surface electricalconductivity of the electrode material, improve the low-temperature performance of the electrode, reduce the electrode structure damaging of the electrode material in the cycle process and obviouslyimprove the cycle performance and the safety performance of the electrode. The method is simple in process and easy to achieve the industrial production.

Description

technical field [0001] The invention belongs to the field of electrode materials, and in particular relates to a coating method of electrode materials, coating materials and applications thereof. Background technique [0002] In recent years, the application range of lithium-ion batteries has been expanding, from small consumer electronics products to large new energy vehicles and energy storage power stations. At the same time, consumers have higher and higher requirements for lithium-ion batteries, including energy density, fast charge and fast discharge performance, safety performance, and long cycle life of lithium-ion batteries. These requirements pose serious challenges to the system design and electrode material design of lithium-ion batteries. [0003] At present, lithium-ion battery electrode materials, especially negative electrode materials (C, Si, Ge, Sn, etc.) have problems such as large volume change, poor conductivity, and poor cycle stability of materials du...

AI Technical Summary

Problems solved by technology

[0003] At present, lithium-ion battery electrode materials, especially negative electrode materials (C, Si, Ge, Sn, etc.) have problems such as large volume change, poor conductivity, and poor cycle stability of materials during cycling, which are also largely limited. The further improvement of the volume energy density of lithium-ion batteries, the further improvement of safety performance, the further optimization of cycle performance, etc., have seriously restricted the in-depth promotion of lithium-ion batteries and the development of industrial scale, especially limiting the development of high-energy-density lithium-ion batteries. further use

In the prior art, the methods for improving the performance of this type of lithium-ion battery electrode materials include polymer coating, oxide coating, fluoride coating, metal ion doping, electrolyte additives, etc., but the above solutions to battery problems The effect achieved by the method is still not ideal, and the above problems can only be alleviated by means of the optimization of the battery system and battery management system, which increases the cost of lithium-ion batteries to a certain extent, which is not conducive to the promotion of lithium-ion batteries

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