All-solid state lithium ion battery composite positive electrode material and preparation method thereof, and all-solid state lithium ion battery

Abstract

Embodiments of the present invention provide an all-solid state lithium ion battery composite positive electrode material, which comprises a positive electrode active material and a cladding layer arranged on the surface of the positive electrode active material, the positive electrode active material is one or a plurality of materials selected from a lithium cobalt oxide, lithium nickelate, lithium manganate, lithium iron phosphate, lithium nickel cobalt manganese, vanadium pentoxide, molybdenum trioxide and titanium disulfide, and the cladding layer material is one or a plurality of lithium-containing transition metal oxides. According to the present invention, with the cladding layer, formation of the space charge layer can be effectively inhibited, the electrode / inorganic solid state electrolyte interface can be improved, and the interface resistance of the all-solid state lithium ion battery can be easily reduced so as to improve cycle stability and durability of the all-solid state lithium ion battery. Embodiments of the present invention further provide a preparation method for the all-solid state lithium ion battery composite positive electrode material, and an all-solid state lithium ion battery containing the all-solid state lithium ion battery composite positive 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 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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