All-solid-state secondary battery

Abstract

This all-solid-state secondary battery comprises a positive electrode active substance layer, a negative electrode active substance layer, and a solid-state electrolyte layer disposed therebetween. Atleast one of the positive electrode active substance layer and the negative electrode active substance layer has lithium vanadium phosphate. The solid-state electrolyte layer has lithium zirconium phosphate. The all-solid-state secondary battery further comprises, between the solid electrolyte layer and the positive electrode active substance layer or the negative electrode active substance layerhaving lithium vanadium phosphate, the following: a first middle layer that has zirconium-containing lithium vanadium phosphate and is disposed on the positive electrode active substance layer side or the negative electrode active substance layer side; and a second middle layer that has vanadium-containing lithium zirconium phosphate and is disposed on the solid-state electrolyte layer side.

Description

technical field [0001] The invention relates to an all solid secondary battery. [0002] This application claims the priority of Japanese Patent Application Japanese Patent Application No. 2018-063522 filed in Japan on March 29, 2018, and the content is incorporated herein by reference. Background technique [0003] Lithium-ion secondary batteries are widely used as power sources for portable small devices such as mobile phones, notebook computers, and PDAs. Lithium-ion secondary batteries used in such portable compact devices need to be smaller, thinner and more reliable. [0004] As the lithium ion secondary battery, a battery using an organic electrolytic solution as an electrolyte and a battery using a solid electrolyte are known. Compared with lithium-ion secondary batteries using organic electrolytes, lithium-ion secondary batteries using solid electrolytes as electrolytes (all-solid secondary batteries) have a higher degree of freedom in battery shape design and are...

AI Technical Summary

Problems solved by technology

However, since dissimilar materials are fired at the same time, it is difficult to join the positive electrode layer, negative electrode layer and solid electrolyte layer that constitute the all-solid secondary battery.

In addition, there is also a problem that peeling occurs at the interface between the positive electrode layer and the negative electrode layer when the positive electrode layer and the negative electrode layer expand and contract with charge and discharge of the all-solid secondary battery, resulting in deterioration of cycle characteristics.

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