Solid electrolyte material of conducting lithium ion, battery device using the solid electrolyte material and all-solid lithium secondary battery provided with the battery device

• US 20090087751A1
• Filed: 09/04/2008
• Published: 04/02/2009
• Est. Priority Date: 09/05/2007
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Shinohara, Yuji, Kawase, Takeo, Kondo, Shigeo, Takeuchi, Yasumasa
• Granted Patent: US 8,895,194 B2
• Time in Patent Office: Days
• US Class Current: 429/309
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 6/18 with solid electrolyte
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A solid electrolyte material of conducting a lithium ion comprises a sulfide-based lithium-ion conductor and α-alumina. Such a solid electrolyte material exhibits superior lithium-ion conductivity. Further, a battery device provided with such a solid electrolyte material is also provided. Furthermore, an all-solid lithium-ion secondary battery provided with such a battery device is also provided.

Claims

1. A solid electrolyte material of conducting a lithium ion, comprising a sulfide-based lithium-ion conductor and α

-alumina.

2. The solid electrolyte material as claimed in claim 1, wherein an amount of α

-alumina contained in the electrolyte material is in the range of 1 to 20 wt % at a ratio by weight to the sulfide-based lithium-ion conductor.

3. The solid electrolyte material as claimed in claim 1, wherein the sulfide-based lithium-ion conductor is constituted of a crystalline material, an amorphous material or a mixture material of the crystalline material and the amorphous material.

4. The solid electrolyte material as claimed in claim 1, wherein the sulfide-based lithium-ion conductor contains a semiconductor as a component thereof.

5. The solid electrolyte material as claimed in claim 1, wherein the sulfide-based lithium-ion conductor contains lithium sulfide (Li₂S), silicone sulfide (Si₂S), and lithium phosphate (Li₃PO₄).

6. The solid electrolyte material as claimed in claim 1 further comprising an organic binder constituted of a resin material as a main constituent material thereof.

7. The solid electrolyte material as claimed in claim 6, wherein the resin material comprises at least one of a styrene block copolymer, polyolefin, polyamide, polyimide and a hot-melt resin as a main component thereof.

8. A battery device, comprising:

a pair of electrodes; and

an electrolyte layer provided between the pair of electrodes;

wherein the solid electrolyte material of conducting a lithium ion defined in claim 1 is contained in the electrolyte layer.

9. An all-solid lithium secondary battery provided with the battery device defined in claim 8.