Solid-state battery and method for manufacturing electrode active material

Patent metadata

Field	Value
Publication number	US-2016204466-A1
Application number	US-201414913166-A
Country	US
Kind code	A1
Filing date	Aug 27, 2014
Priority date	Sep 2, 2013
Publication date	Jul 14, 2016
Grant date	—

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.

First claim

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 .

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 .

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

Assignees

• Mitsubishi Gas Chemical Co
• Tohoku Techno Arch Co Ltd

Inventors

• Nogami Genki
• Taniguchi Mitsugu
• Tazawa Masaru
• UNEMOTO Atsushi
• Matsuo Motoaki
• Orimo Shinichi

Classifications

• H01M4/5815

  Sulfides · CPC title

• H01M4/604

  containing aliphatic main chain polymers · CPC title

• H01M2220/20

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

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M4/1397

  of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title