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JP-2026075476-A - Batteries and battery systems

JP2026075476AJP 2026075476 AJP2026075476 AJP 2026075476AJP-2026075476-A

Abstract

[Problem] To provide a battery that can detect early on when the inside of the housing is exposed to the outside air. [Solution] The battery according to the present disclosure has a positive electrode layer, an electrolyte layer, and a negative electrode layer, and at least one of the positive electrode layer, the electrolyte layer, and the negative electrode layer comprises an electrode body containing a sulfide solid electrolyte, a housing, and an insulating member provided between the electrode body and the housing, wherein the insulating member contains a sulfide solid electrolyte. [Selection Diagram] Figure 2

Inventors

  • 山本 邦光

Assignees

  • トヨタ自動車株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (5)

  1. An electrode body having a positive electrode layer, an electrolyte layer, and a negative electrode layer, wherein at least one of the positive electrode layer, the electrolyte layer, and the negative electrode layer contains a sulfide solid electrolyte, The casing and The electrode body and the housing are provided with an insulating member, A battery in which the insulating member contains a sulfide solid electrolyte.
  2. The battery according to claim 1, wherein the sulfide solid electrolyte contained in the insulating member is an argyrodite-type sulfide solid electrolyte.
  3. The battery according to claim 1, which is a solid-state battery.
  4. The battery according to claim 1, wherein the housing is a laminated type housing.
  5. The battery according to claim 1, Hydrogen sulfide detection unit, A battery system comprising: a determination unit that determines the generation of hydrogen sulfide based on the detection results of the hydrogen sulfide detection unit.

Description

This disclosure relates to batteries and battery systems. For example, Patent Document 1 discloses an all-solid-state battery in which an electrode laminate having a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive and negative electrodes is sealed inside an outer casing, characterized in that a composition containing a desiccant and a resin is disposed in the void portion inside the outer casing. Japanese Patent Publication No. 2023-037971 This is a schematic cross-sectional view of a conventional battery.This is a schematic cross-sectional view of an example of a battery related to this disclosure.This is a schematic cross-sectional view of another example of the battery related to this disclosure.This is a schematic cross-sectional view of yet another example of the battery related to this disclosure.This is a schematic cross-sectional view of yet another example of the battery related to this disclosure. The battery described herein will be explained in detail below with reference to the drawings. The following figures are schematic representations, and the size and shape of each part have been exaggerated for ease of understanding. (battery) The battery according to this disclosure has a positive electrode layer, an electrolyte layer, and a negative electrode layer, and at least one of the positive electrode layer, the electrolyte layer, and the negative electrode layer comprises an electrode body containing a sulfide solid electrolyte, a housing, and an insulating member provided between the electrode body and the housing, wherein the insulating member contains a sulfide solid electrolyte. Furthermore, the battery according to this disclosure is preferably a solid-state battery. The structure of the solid-state battery has a multilayer structure of positive electrode/solid electrolyte layer/negative electrode. Solid-state batteries include so-called all-solid-state batteries that use a solid electrolyte as the electrolyte, and the solid electrolyte may contain less than 10% by mass of electrolyte relative to the total amount of electrolyte. The solid electrolyte may also be a composite solid electrolyte containing an inorganic solid electrolyte and a polymer electrolyte. The battery according to this disclosure includes a sulfide solid electrolyte in the insulating material. The sulfide solid electrolyte reacts with moisture in the air to quickly release a small amount of hydrogen sulfide, making it possible for a hydrogen sulfide sensor to detect when the inside of the housing is exposed to the outside air (seal-out). Furthermore, because the seal-out can be detected early, it is possible to detect it before the electrode body comes into contact with the outside air, thereby suppressing the deterioration of battery performance. <Insulating material> The battery according to this disclosure has an insulating member provided between the electrode body and the housing, wherein the insulating member contains a sulfide solid electrolyte. The sulfide solid electrolyte can be any known type, such as glass ceramics or argyrodite-type solid electrolytes. Sulfide solid electrolytes include, for example, LiI-LiBr-Li 3 PS 4 , Li 2 S-SiS 2 , LiI-Li 2 S-SiS 2 , LiI-Li 2 S-P 2 S 5 , LiI-Li 2 O-Li 2 SP 2 S 5 , LiI-Li 2 S-P 2 O 5 , LiI-Li 3 PO 4 -P 2 S 5 , Li 2 S-GeS 2 -P 2 S 5 , Li 2 S-P 2 S 5 , Li 10 GeP 2 S 12 , Li 4 P 2 S 6 , Li 7 P 3 S 11 , Li 3 PS 4 It may contain at least one selected from the group consisting of Li 7 PS 6 and Li 6 PS 5 X (X = Cl, Br, I). In particular, from the viewpoint of early detection of seal-out, it is preferable that the sulfide solid electrolyte is an argyrodite-type sulfide solid electrolyte. Algyrodite-type solid electrolytes contain elements Li, P, S, and X (where X is a halogen). Examples of element X include F, Cl, Br, and I. There may be one or more types of element X. The compositional formula can be expressed, for example, by distinguishing the types of element X as X1 (halogen 1) and X2 (halogen 2), as follows: Li 7-y-z PS 6-y-z X1 y X2 z (y≧0, Z≧0, 1≦y+z≦1.8). Specifically, examples include Li 6 PS 5 Cl, Li 6 PS 5 Br, Li 6 PS 5 I, Li 6 PS 5 Cl 0.75 Br 0.25 , Li 6 PS 5 Cl 0.5 Br 0.5 , Li 5.75 PS 4.75 Cl 1.25 , Li 5.5 PS 4.5 Cl 1.5, etc., but are not limited to these. The shape and size of the insulating material should be appropriately selected according to the shape and size of the battery, electrode body, housing, etc. Preferably, the insulating material may be an insulating material made of a sulfide solid electrolyte, an insulating material made of a resin containing a sulfide solid electrolyte, or an insulating material having a laminated structure of resin and sulfide solid electrolyte. Furthermore, in insulating members having a laminated structure, it is preferable that the resin layer is on the electrode side and the sulfide solid electrolyte layer is on the housing side. There are no particular restrictions on the