Solid-state battery

Patent metadata

Field	Value
Publication number	US-2022013873-A1
Application number	US-202117484282-A
Country	US
Kind code	A1
Filing date	Sep 24, 2021
Priority date	Mar 26, 2019
Publication date	Jan 13, 2022
Grant date	—

Abstract

A solid-state battery that includes a solid-state battery laminate having at least one battery constituent unit in a lamination direction, the battery constituent unit including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer; a positive electrode terminal on a surface of the solid-state battery laminate; and a negative electrode terminal on the surface of the solid-state battery laminate. In addition, the negative electrode layer includes a negative electrode active material configured to be charged and discharged at a potential of −2 V or less with respect to a standard electrode potential, and the negative electrode terminal includes a terminal material that does not react with lithium ions at a potential of −3 V to −2 V with respect to the standard electrode potential.

First claim

1 . A lithium ion solid-state battery comprising:
a solid-state battery laminate having at least one battery constituent unit in a lamination direction, the battery constituent unit including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer; a positive electrode terminal on a surface of the solid-state battery laminate and electrically connected to the positive electrode layer; and a negative electrode terminal on the surface of the solid-state battery laminate and electrically connected to the negative electrode layer, wherein the negative electrode layer comprises a negative electrode active material configured to be charged and discharged at a potential of −2 V or less with respect to a standard electrode potential, and the negative electrode terminal comprises a terminal material that does not react with the lithium ions at a potential of −3 V to −2 V with respect to the standard electrode potential.

2 . The lithium ion solid-state battery according to claim 1 , wherein a ratio of an average of first differential values at −3 V to −2 V to an average of second differential values at −2 V to −1 V is 8.0 or less, the first and second differential values being a differential of a current value obtained by linear sweep voltammetry measurement using the negative electrode terminal and lithium as a working electrode and a reference electrode, respectively, and using a potential with respect to the standard electrode potential as a parameter.

3 . The lithium ion solid-state battery according to claim 2 , wherein the ratio of the average of the first differential values at −3 V to −2 V to the average of the second differential values at −2 V to −1 V is 6.0 or less.

4 . The lithium ion solid-state battery according to claim 2 , wherein the ratio of the average of the first differential values at −3 V to −2 V to the average of the second differential values at −2 V to −1 V is 4.0 or less.

5 . The lithium ion solid-state battery according to claim 2 , wherein the ratio of the average of the first differential values at −3 V to −2 V to the average of the second differential values at −2 V to −1 V is 2.0 or less.

6 . The lithium ion solid-state battery according to claim 1 , wherein the negative electrode terminal further comprises a metallic material having a conductivity higher than that of the terminal material, and the terminal material is positioned on a side of the negative electrode terminal that is in contact with the solid-state battery laminate.

7 . The lithium ion solid-state battery according to claim 1 , wherein the negative electrode terminal further comprises metallic material particles having a conductivity higher than that of the terminal material, and the terminal material is on surfaces of the metallic material particles.

8 . The lithium ion solid-state battery according to claim 1 , wherein the terminal material is at least one material selected from nickel, copper, manganese, cobalt, iron, titanium, and chromium.

9 . The lithium ion solid-state battery according to claim 8 , wherein the negative electrode active material is graphite and/or a lithium alloy.

10 . The lithium ion solid-state battery according to claim 1 , wherein the negative electrode active material is graphite and/or a lithium alloy.

11 . The lithium ion solid-state battery according to claim 8 , wherein the solid electrolyte layer comprises at least two materials selected from lithium, boron, silicon, phosphorus, and oxygen.

12 . The lithium ion solid-state battery according to claim 1 , wherein the solid electrolyte layer comprises at least two materials selected from lithium, boron, silicon, phosphorus, and oxygen.

Assignees

• Murata Manufacturing Co

Inventors

• Kumagae Kiyoshi
• Matsuyama Takuya
• Shimizu Keisuke

Classifications

• H01M50/562 Primary

  characterised by the material · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title