A kind of all-solid-state battery composite structure, its preparation method and use

Abstract

The invention discloses an all-solid-state battery composite structure, its preparation method and application. The all-solid-state battery composite structure includes a positive electrode material layer, an aluminum fluoride transition layer and a solid electrolyte layer sequentially arranged on the surface of the positive electrode active material layer. Aiming at the problems in the prior art that the oxide electrolyte is difficult to form, the density is difficult to increase, the conductivity is low, and the interface between the positive electrode material and the oxide solid electrolyte reacts chemically during the high temperature forming process. The all-solid-state battery structure of the present invention improves the ionic conductivity and the stability of the material, and can effectively promote the sintering of the interface, improve the interface bonding force, reduce the porosity of the material, and increase the density of the positive electrode sheet and the solid electrolyte, which can be very good Solve the problem of adverse reactions between the positive electrode sheet and the electrolyte layer.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and in particular relates to an all-solid-state battery composite structure, its preparation method and application. Background technique [0002] Compared with traditional liquid lithium-ion batteries, solid-state lithium secondary batteries have many advantages such as high energy density, high safety and reliability, wide operating temperature and long cycle life. Solid electrolyte materials are the core of the development of solid-state lithium metal secondary batteries, fundamentally determine the configuration of the battery system, and are the key to achieving high energy density, high safety and high cycle stability of solid-state lithium batteries. [0003] In solid-state lithium batteries, the interface has a crucial impact on battery performance. The interface between the electrode and the electrolyte in a solid-state lithium battery changes from a solid / liquid interface...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems in the existing technology that the oxide electrolyte is difficult to form, the density is difficult to increase, the conductivity is low, and the positive electrode material and the oxide solid electrolyte interface chemically react during the high temperature forming process

The all-solid-state battery composite structure has the advantages of improving ionic conductivity, improving the density of the positive electrode sheet and solid electrolyte, and reducing the porosity to increase the density of the electrode sheet; and can avoid the reaction between the positive electrode oxide material and the electrolyte during the battery preparation process, Improve material stability and interfacial bonding, solving the problem of adverse reactions between the positive electrode sheet and the electrolyte layer