Patent ID: 11881561
Assignee: TDK CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. An all-solid-state secondary battery, comprising:
a positive electrode active material layer;
a negative electrode active material layer; and
a solid electrolyte layer located between the positive electrode active material layer and the negative electrode active material layer,
wherein at least one of the positive electrode active material layer and the negative electrode active material layer contains lithium vanadium phosphate,
wherein the solid electrolyte layer contains lithium zirconium phosphate, and
wherein both of a first intermediate layer and a second intermediate layer which are in direct physical contact with each other are provided between the positive electrode active material layer containing lithium vanadium phosphate or the negative electrode active material layer containing lithium vanadium phosphate and the solid electrolyte layer,
the first intermediate layer contains lithium vanadium phosphate containing zirconium and is located on a side of the positive electrode active material layer or the negative electrode active material layer, and the second intermediate layer contains lithium zirconium phosphate containing vanadium and is located on a side of the solid electrolyte layer,
wherein the first intermediate layer and the second intermediate layer have a zirconium concentration gradient and a vanadium concentration gradient inside,
wherein a zirconium concentration and a vanadium concentration between the first intermediate layer and the positive electrode active material layer or the negative electrode active material layer change continuously, and
wherein a zirconium concentration and a vanadium concentration between the second intermediate layer and the solid electrolyte layer change continuously.