Solid-state battery

• US 10,038,192 B2
• Filed: 08/27/2014
• Issued: 07/31/2018
• 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: Nogami, Genki, Taniguchi, Mitsugu, Unemoto, Atsushi, Matsuo, Motoaki, Orimo, Shinichi
• Primary Examiner(s): Rhee, Jane
• Application Number:
  US14/913,172
• Publication Number:
  US 20160204467A1
• Time in Patent Office: 1,434 Days
• CPC Class Codes: H01B 1/122 Ionic conductors
• 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 2004/027 Negative electrodes
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 2220/10 Batteries in stationary systems, e.g. emergency power source in plant
• 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 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• 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 and/or the solid electrolyte layer contains a sulfide solid electrolyte, the negative-electrode layer and/or the solid electrolyte layer contains a solid electrolyte comprising a hydride of a complex, and at least part of the sulfide solid electrolyte is in contact with at least part of the 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 sulfide solid electrolyte,

either or both of the negative-electrode layer and the solid electrolyte layer contain a complex hydride solid electrolyte,

at least part of the sulfide solid electrolyte is in contact with at least part of the complex hydride solid electrolyte; and

the positive-electrode layer does not contain the complex hydride solid electrolyte.

2. The solid-state battery according to claim 1, wherein the solid electrolyte layer comprises:

a first solid electrolyte layer on the positive electrode side, the first solid electrolyte layer containing a sulfide solid electrolyte; and

a second solid electrolyte layer on the negative electrode side, the second solid electrolyte layer containing a complex hydride solid electrolyte.

3. The solid-state battery according to claim 1, wherein the sulfide solid electrolyte contains at least one material selected from the group consisting of Li₂S—

P₂S₅-based materials, Li₂S—

SiS₂-based materials, and Li₂S—

GeS₂-based materials.

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 lithium halide, a rubidium halide, a cesium halide, and a lithium amide.

6. The solid-state battery according to claim 1, wherein the negative-electrode layer contains a complex hydride solid electrolyte.