Sheet and electric storage device

Abstract

To provide a sheet and an electric storage device that can make full use of a solid electrolyte.SOLUTION: A sheet comprises an oxide-based solid electrolyte and a binder section that binds the solid electrolyte. The ratio of the volume of the binder section to the volume of the solid electrolyte is 1 / 8 or less. The solid electrolyte includes one in which at least one bulk particle is exposed on both front surface and back surface of the sheet. An electric storage device comprises a positive electrode layer, a negative electrode layer, a separator that separates the positive electrode layer and the negative electrode layer, and the sheet.SELECTED DRAWING: Figure 1

Claims

1. A sheet including an oxide-based solid electrolyte and a bonding portion that bonds the solid electrolyte, a ratio of the volume of the binding portion to the volume of the solid electrolyte is 1 / 8 or less; The solid electrolyte sheet includes one bulk particle exposed on both the front and back surfaces of the sheet.

2. The sheet according to claim 1 , wherein the solid electrolyte has one bulk particle exposed at a plurality of locations on at least one of the front surface and the back surface.

3. 3. The sheet according to claim 1, wherein the bonding portion is made of an insulating material.

4. 3. The sheet according to claim 1, wherein the adhesive portion has ion conductivity.

5. 3. The sheet according to claim 1, wherein the binding portion has a Young's modulus of 0.3 GPa or more.

6. 3. The sheet according to claim 1, wherein the crystal structure of the solid electrolyte is at least one of a NASICON type and a garnet type containing Li, La and Zr.

7. The crystal structure of the solid electrolyte is a garnet type containing Li, La, and Zr, 3. The sheet according to claim 1, wherein the concentration of carbonate ions in the portions of the solid electrolyte exposed on the front surface and the back surface is 10 atm % or less.

8. An electricity storage device including a positive electrode layer, a negative electrode layer, and a separator separating the positive electrode layer and the negative electrode layer, An electricity storage device comprising the sheet according to claim 1 or 2.

9. The electricity storage device according to claim 8 , wherein the separator includes the sheet.

10. At least one of the positive electrode layer and the negative electrode layer includes a current collecting layer; a protective layer in contact with at least one of the separator and the current collecting layer; The electricity storage device according to claim 8 , wherein the protective layer includes the sheet.

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