Patent ID: 11404726

Abstract:
Provided is an all-solid-state sodium ion secondary battery in which a current collector is difficult to peel from an electrode layer and which can suppress the decreases in discharge capacity and discharge voltage. An all-solid-state sodium ion secondary battery 1 according to the present invention includes: a solid electrolyte layer 2 made of a sodium ion-conductive oxide; a positive electrode layer 3 formed on a first principal surface 2a of the solid electrolyte layer 2; a negative electrode layer 4 formed on a second principal surface 2b of the solid electrolyte layer 2; and a current collector layer 5, 6 formed on a principal surface of at least one of the positive electrode layer 3 and the negative electrode layer 4, wherein the current collector layer 5, 6 is made of at least one metallic material selected from the group consisting of aluminum, titanium, silver, copper, stainless steel, and alloys thereof, and the current collector layer 5, 6 has a thickness of not less than 10 nm and not more than 10 μm.