All-solid-state rechargeable battery, stacked all-solid-state rechargeable battery

Abstract

To provide an all-solid-state secondary battery that can place a positive electrode current collector in the desired position as reliably as possible, and can early detect a problem with the placement of the positive electrode current collector in the manufacturing stage and prevent a short circuit from occurring.SOLUTION: An all-solid-state secondary battery includes a positive electrode layer, a negative electrode layer, a solid electrolyte layer arranged between these layers, and an insulating layer that prevents the positive electrode layer and the negative electrode layer from coming into contact with each other and short-circuiting. The solid electrolyte layer is laminated on both sides of the positive electrode layer; the negative electrode layer is laminated on a surface of each solid electrolyte layer opposite to the positive electrode layer; the insulating layer is disposed on a side end surface of the positive electrode layer so as to cover the positive electrode layer; and the insulating layer is configured such that the position of the outer edge of the positive electrode layer covered by the insulating layer can be optically identified through the insulating layer.SELECTED DRAWING: Figure 1

Claims

1. The positive electrode layer, The negative electrode layer, A solid electrolyte layer is placed between these, The system includes an insulating layer that prevents the positive electrode layer and the negative electrode layer from coming into contact and short-circuiting. The solid electrolyte layer is laminated on both sides of the positive electrode layer, The negative electrode layer is laminated on the side of each solid electrolyte layer opposite to the positive electrode layer, The insulating layer is arranged so as to cover the positive electrode layer on the side end surface of the positive electrode layer. The positive electrode layer comprises a foil-shaped positive electrode current collector and positive electrode active material layers laminated on both sides of the positive electrode current collector, The insulating layer is such that the position of the outer edge of the positive electrode current collector covered by the insulating layer can be optically identified through the insulating layer. An all-solid-state secondary battery characterized in that at least a portion of the side end of the positive electrode current collector protrudes outward from the side end surface of the positive electrode active material layer.

2. The all-solid-state secondary battery according to claim 1, wherein the total light transmittance of the insulating layer is 25% or more and less than 100%.

3. The all-solid-state secondary battery according to claim 1 or 2, wherein the linear light transmittance of the insulating layer at at least one wavelength within the wavelength range of 400 nm to 800 nm is 20% or more and less than 100% when calculated with an insulating layer thickness of 100 μm.

4. The insulating layer contains a resin and has a volume resistivity of 10 １２ An all-solid-state secondary battery according to any one of claims 1 to 3, characterized in that it has a resistance of Ω / cm or more.

5. The all-solid-state secondary battery according to claim 4, characterized in that the insulating layer further contains an insulating filler.

6. The all-solid-state secondary battery according to claim 5, characterized in that the insulating filler consists of one or more substances selected from the group consisting of fibrous resin, resin nonwoven fabric, alumina, magnesium oxide, silica, boehmite, barium titanate, barium carbonate, yttria, and manganese oxide.

7. The positive electrode current collector comprises a positive electrode current collector section for electrically connecting to external wiring, The positive electrode current collector is provided so as to protrude laterally along the surface of the positive electrode current collector, The all-solid-state secondary battery according to claim 1, characterized in that a part or all of the outer edge of the insulating layer in the direction in which the positive electrode current collector protrudes is located outside the outer edge of the negative electrode layer.

8. The all-solid-state secondary battery according to claim 7, characterized in that a part or all of the outer edge of the negative electrode layer is disposed on the insulating layer.

9. The all-solid-state secondary battery according to any one of claims 1 to 8, characterized in that the solid electrolyte layer contains a sulfide-based solid electrolyte containing at least lithium, phosphorus, and sulfur.

10. The all-solid-state secondary battery according to any one of claims 1 to 9, characterized in that the negative electrode layer includes a negative electrode active material that forms an alloy with lithium and / or a negative electrode active material that forms a compound with lithium, metallic lithium can be deposited inside the negative electrode layer during charging, and 80% or more of the charging capacity of the negative electrode layer is provided by metallic lithium.

11. The all-solid-state secondary battery according to any one of claims 1 to 10, characterized in that the negative electrode layer contains one or more selected from the group consisting of amorphous carbon, gold, platinum, palladium, silicon, silver, aluminum, bismuth, tin, and zinc.

12. A stacked all-solid-state secondary battery characterized by having two or more all-solid-state secondary batteries according to claims 1 to 11 stacked together.

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