Solid electrolyte sheets and all-solid-state batteries

Abstract

To provide a solid electrolyte sheet capable of preventing the occurrence of a short circuit even when a metal foreign substance is mixed into an all-solid-state battery while suppressing the battery resistance of the all-solid-state battery.SOLUTION: The solid electrolyte sheet of the present disclosure includes a nonwoven fabric and a solid electrolyte disposed inside the nonwoven fabric. The solid electrolyte includes a sulfide solid electrolyte. The pore diameter of the nonwoven fabric is 15 μm or less. The ratio of the pore diameter to the particle diameter of the solid electrolyte (pore diameter / particle diameter) is 5.0 or more and 10.0 or less. The pore size indicates a maximum pore size of the nonwoven fabric measured by a bubble point method in accordance with JIS K 3832. The particle size refers to a particle size corresponding to 50% of a value of a volume-based cumulative particle size distribution of the solid electrolyte measured using a laser diffraction particle size distribution analyzer.SELECTED DRAWING: None

Claims

1. Nonwoven fabric and A solid electrolyte placed inside the nonwoven fabric, Equipped with, The solid electrolyte includes a sulfide solid electrolyte, The pore size of the nonwoven fabric is 15 μm or less. The ratio of the pore diameter to the particle size of the solid electrolyte (pore diameter / particle size) is 5.0 or more and 10.0 or less. The aforementioned pore diameter represents the maximum pore diameter of the nonwoven fabric measured by the bubble point method in accordance with JIS K 3832. A solid electrolyte sheet for an all-solid-state battery, wherein the particle size corresponds to a particle size that represents 50% of the volume-based cumulative particle size distribution value of the solid electrolyte measured using a laser diffraction particle size distribution analyzer.

2. The solid electrolyte sheet according to claim 1, wherein the thickness of the nonwoven fabric is 10 μm or more and 30 μm or less.

3. The solid electrolyte sheet according to claim 1 or claim 2, wherein the particle size is 3.0 μm or less.

4. It comprises a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer, The solid electrolyte layer comprises the solid electrolyte sheet described in claim 1 or claim 2, in an all-solid-state battery.

5. The solid electrolyte sheet according to claim 1, wherein the nonwoven fabric is made of a polyester resin or a polyamide resin.

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