A battery includes a positive electrode current collector, a positive electrode, a first electrolyte layer, a second electrolyte layer, a negative electrode, and a negative electrode current collector in this order. The first electrolyte layer contains a first solid electrolyte material, and the second electrolyte layer contains a second solid electrolyte material, the second solid electrolyte material being different from the first solid electrolyte material. An oxidation potential of the first solid electrolyte material is more noble than an oxidation potential of the second solid electrolyte material. The first electrolyte layer covers the positive electrode and is in contact with the positive electrode current collector, and/or the first electrolyte layer covers the second electrolyte layer and is in contact with the negative electrode current collector.
1. A battery comprising:
a positive electrode current collector;
a positive electrode;
a first electrolyte layer;
a second electrolyte layer;
a negative electrode; and
a negative electrode current collector, wherein
the positive electrode current collector, the positive electrode, the first electrolyte layer, the second electrolyte layer, the negative electrode, and the negative electrode current collector are disposed in this order and are stacked in a stacking direction,
the first electrolyte layer contains a first solid electrolyte material,
the second electrolyte layer contains a second solid electrolyte material, the second solid electrolyte material being different from the first solid electrolyte material,
an oxidation potential of the first solid electrolyte material is more noble than an oxidation potential of the second solid electrolyte material,
the first electrolyte layer is a single-layer structure,
the first electrolyte layer directly covers the positive electrode in the stacking direction and is in contact with the positive electrode current collector,
at least part of the first electrolyte layer is disposed between the positive electrode and the second electrolyte layer in the stacking direction, and
the first electrolyte layer covers the second electrolyte layer and is in direct contact with the negative electrode current collector.
2. The battery according to claim 1 , wherein the first electrolyte layer is in contact with the positive electrode.
3. The battery according to claim 1 , wherein the second electrolyte layer is in contact with the negative electrode and covers the negative electrode.
4. The battery according to claim 1 , wherein the first electrolyte layer is in contact with the second electrolyte layer and covers the second electrolyte layer.
5. The battery according to claim 1 , wherein the second electrolyte layer is in contact with the first electrolyte layer and covers the first electrolyte layer.
6. The battery according to claim 1 , wherein the first solid electrolyte material contains Li, M, and X,
where M is at least one selected from the group consisting of metalloid elements and metal elements other than Li, and X is at least one selected from the group consisting of F, Cl, Br, and I.
7. The battery according to claim 6 , wherein the first solid electrolyte material is represented by a composition formula of Li α M β X γ ,
where α, β, and γ are each a value greater than zero.
8. The battery according to claim 6 , wherein M includes yttrium.
9. The battery according to claim 1 , wherein the second solid electrolyte material is a sulfide solid electrolyte.
10. The battery according to claim 1 , wherein the first electrolyte layer partially includes a solid electrolyte material that is the same as one in the second electrolyte layer.
11. The battery according to claim 10 , wherein the solid electrolyte material that is included in the second electrolyte layer and also included in the first electrolyte layer is present in an amount of less than or equal to 30% relative to an amount of the second electrolyte layer in terms of a volume fraction.
12. The battery according to claim 1 , wherein the first electrolyte layer completely covers the positive electrode seen from the stacking direction.
13. The battery according to claim 1 , wherein the first electrolyte layer as a whole is an integrated one piece.
14. The battery according to claim 1 , wherein the first electrolyte layer consists of a single solid electrolyte material.