A kind of all-solid-state lithium-ion battery composite electrode material and its preparation method and all-solid-state lithium-ion battery

Abstract

Embodiment of the present invention provides a solid-state lithium ion battery electrode composite material comprising an electrode active material and a coating layer provided on the surface of the electrode active material, wherein the material of the coating layer comprising by weight: polymer formed of 0.1-20 parts of polymer monomer and 0.1-50 parts of ethylene glycol derivative, 0.1 to 10 parts of lithium salt, 0.1 to 10 parts of a polymerization initiator, 50 to 99.9 parts of a plasticizer, wherein the polymer monomer is selected from one or several monomers of fluorine-containing polymer monomer, ether polymer monomer, acrylic polymer monomer and acrylonitrile polymer monomer. The coating layer can effectively suppress the formation of space charge layer; reduce interface resistance of the solid-state lithium ion battery, thereby improving solid-state battery cycle stability and durability. Embodiments of the present invention also provide a preparation method of the solid-state lithium ion battery electrode material composite, and solid-state lithium-ion batteries comprising the composite electrode material.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to an all-solid-state lithium-ion battery composite electrode material, a preparation method thereof, and an all-solid-state lithium-ion battery. Background technique [0002] Since the 1990s, among many alternative energy products, lithium-ion batteries have attracted people's close attention due to their high energy density, good cycle performance, and no memory effect. [0003] In recent years, with the increasing demand for battery applications for electric vehicles and large stationary equipment, all-solid-state lithium-ion batteries with safety and long life have begun to attract attention. They use non-combustible solid inorganic substances as electrolytes, not only have high Energy density, and at the same time has the advantages of good safety and stability, simple installation device, and low manufacturing cost. [0004] At present, most of the inorganic solid-state e...

AI Technical Summary

Problems solved by technology

However, there is a common problem in the application of sulfide solid electrolytes, that is, at the electrode / solid electrolyte interface, sulfide solid electrolytes with chalcogen elements represented by cross-linked sulfur are easy to react with electrode active materials and decompose, thus forming space The charge layer, which forms a high resistance to the movement of lithium ions at the interface between the electrode / solid electrolyte, resulting in a battery with lower output power, lower durability and cycle performance

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