All-solid-state battery and method for manufacturing the same, and battery module

Abstract

The application discloses a full solid battery and a preparation method thereof, and a battery module. The full solid battery comprises a positive electrode sheet, a negative electrode sheet and a sulfide solid electrolyte layer between the positive electrode sheet and the negative electrode sheet which are arranged in a stack; the positive electrode sheet comprises a positive electrode current collector and a composite positive electrode layer on at least one side of the positive electrode current collector; wherein the composite positive electrode layer comprises a high-voltage oxide positive electrode main material, an oxide solid electrolyte, a conductive oxide and a sintering aid; the particles of the high-voltage oxide positive electrode main material, the oxide solid electrolyte and the conductive oxide are combined through sintering necks based on the sintering aid; the sintering aid comprises at least one of a metal element, an inorganic oxide, a metal fluoride, a metal nitride and a lithium-containing compound; the problems of poor physical contact and unstable chemical interface between the oxide positive electrode and the sulfide solid electrolyte are solved, and the safety performance of the battery is greatly increased.

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