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

Abstract

Provided in the present invention is a composite positive electrode material for a full solid state lithium ion battery; the composite positive electrode material for a full solid state lithium ion battery comprises: a positive electrode active material and a coating layer disposed on the surface of the positive electrode active material; the positive electrode active material is one or more of lithium cobalt oxide, lithium nickelate, lithium manganese, lithium iron phosphate, lithium nickel cobalt manganese oxide, vanadium pentoxide, molybdenum trioxide and titanium disulfide; the material of the coating layer is one or more of transition metal oxides containing lithium; the coating layer can effectively control the formation of a space charge layer, improve the interface of the electrode / inorganic solid state electrolyte, facilitate reducing the interface resistance of the full solid state lithium ion battery, and thus increase the cycle stability and durability of the full solid state lithium ion battery. Also provided in the present invention are a preparation process for the composite positive electrode material for a full solid state lithium ion battery, and a full solid state lithium ion battery comprising the composite positive electrode material for a full solid state lithium ion battery.

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 positive 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 soli...

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Problems solved by technology

[0005] In view of this, the first aspect of the embodiment of the present invention provides an all-solid-state lithium-ion battery composite positive electrode material to solve the problem that the sulfide solid electrolyte is easily decomposed by reacting with the positive electrode active material, thereby forming a space charge layer, and making the electrode / solid electrolyte A high resistance to the movement of lithium ions is formed at the interface between them, causing the battery to have lower output power, lower durability and cycle performance problems

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