SOLID-STATE BATTERY AND METHOD FOR MANUFACTURING ELECTRODE ACTIVE MATERIAL

• US 20160204466A1
• Filed: 08/27/2014
• Published: 07/14/2016
• Est. Priority Date: 09/02/2013
• Status: Active Grant

• Current Assignee: Mitsubishi Gas Chemical Company Incorporated (Mitsubishi Electric Corporation), Tohoku Techno Arch Co., Ltd.
• Original Assignee: Mitsubishi Gas Chemical Company Incorporated (Mitsubishi Electric Corporation), Tohoku Techno Arch Co., Ltd.
• Inventors: TAZAWA, Masaru, NOGAMI, Genki, TANIGUCHI, Mitsugu, UNEMOTO, Atsushi, MATSUO, Motoaki, ORIMO, Shinichi
• Granted Patent: US 10,147,937 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/0471 involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
• CPC Class Codes: H01M 4/136 Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
• CPC Class Codes: H01M 4/137 Electrodes based on electro-active polymers
• CPC Class Codes: H01M 4/1397 of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
• CPC Class Codes: H01M 4/1399 of electrodes based on electro-active polymers
• CPC Class Codes: H01M 4/364 as mixtures
• CPC Class Codes: H01M 4/38 of elements or alloys
• CPC Class Codes: H01M 4/5815 Sulfides
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 4/604 containing aliphatic main chain polymers
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

One embodiment provides a solid-state battery that has a positive-electrode layer; a negative-electrode layer; and a lithium-ion-conducting solid electrolyte layer disposed between the positive-electrode layer and the negative-electrode layer. The positive-electrode layer contains a positive-electrode active material and a solid electrolyte comprising a hydride of a complex. Said positive-electrode active material is sulfur-based, and the solid electrolyte layer contains a solid electrolyte comprising a hydride of a complex.

Claims

1. A solid-state battery comprising:

a positive-electrode layer;

a negative-electrode layer; and

a lithium-ion-conducting solid electrolyte layer disposed between the positive-electrode layer and the negative-electrode layer, wherein

the positive-electrode layer contains a positive-electrode active material and a complex hydride solid electrolyte,

the positive-electrode active material is a sulfur-based electrode active material, and

the solid electrolyte layer contains a complex hydride solid electrolyte.

2. The solid-state battery according to claim 1, wherein the sulfur-based electrode active material is an inorganic sulfur compound or a sulfur-polyacrylonitrile.

3. The solid-state battery according to claim 2, wherein the inorganic sulfur compound is selected from the group consisting of S, S-carbon composite, TiS2, TiS3, TiS4, NiS, FeS2, and MoS2.

4. The solid-state battery according to claim 1, wherein the complex hydride solid electrolyte is LiBH4 or a combination of LiBH4 and an alkali metal compound represented by Formula (1) below:

MX 

 

(1),

wherein M represents an alkali metal atom selected from the group consisting of a lithium atom, a rubidium atom, and a cesium atom, and X represents a halogen atom or an NH2 group.

5. The solid-state battery according to claim 4, wherein the alkali metal compound is selected from the group consisting of a rubidium halide, a lithium halide, a cesium halide, and a lithium amide.

6. The solid-state battery according to claim 1, wherein the positive-electrode layer is formed by pressing.

7. A method for manufacturing a sulfur-based electrode active material doped with lithium, comprising:

doping a sulfur-based electrode active material with lithium by mixing the sulfur-based electrode active material with a material containing a lithium-containing complex hydride.

8. The method for manufacturing a sulfur-based electrode active material doped with lithium according to claim 7, wherein the step of doping the sulfur-based electrode active material with lithium is performed by mixing the sulfur-based electrode active material with the material containing a lithium-containing complex hydride, followed by heating at 60°

C. to 200°

C.

9. The method for manufacturing a sulfur-based electrode active material doped with lithium according to claim 7, wherein the sulfur-based electrode active material is selected from the group consisting of a sulfur-polyacrylonitrile, a disulfide compound, TiS2, TiS3, TiS4, NiS, NiS2, CuS, FeS2, and MoS3.

10. The method for manufacturing a sulfur-based electrode active material doped with lithium according to claim 7, wherein the material containing a lithium-containing complex hydride is LiBH4 or a combination of LiBH4 and an alkali metal compound represented by Formula (1) below:

MX 

 

(1),

wherein M represents an alkali metal atom selected from the group consisting of a lithium atom, a rubidium atom, and a cesium atom, and X represents a halogen atom or an NH2 group.

11. The method for manufacturing a sulfur-based electrode active material doped with lithium according to claim 10, wherein the alkali metal compound is selected from the group consisting of a rubidium halide, a lithium halide, a cesium halide, and a lithium amide.

12. An electrode comprising a sulfur-based electrode active material doped with lithium manufactured by the method according to claim 7.

16. A solid-state battery comprising the electrode according to claim 12.

13. A method for manufacturing an electrode, comprising:

preparing a mixture of a sulfur-based electrode active material and a material containing a lithium-containing complex hydride;

applying the mixture to a current collector; and

doping the sulfur-based electrode active material with lithium by heating the mixture-applied current collector.

14. An electrode manufactured by the method according to claim 13.

15. A solid-state battery comprising the electrode according to claim 14.