SULFIDE SOLID ELECTROLYTE MATERIAL, BATTERY, AND METHOD FOR PRODUCING SULFIDE SOLID ELECTROLYTE MATERIAL

• US 20160028106A1
• Filed: 07/13/2015
• Published: 01/28/2016
• Est. Priority Date: 07/22/2014
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: KATO, Yuki
• Application Number:
  US14/797,723
• Publication Number:
  US 20160028106A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C01B 17/22 Alkali metal sulfides or polysulfides
• CPC Class Codes: C01G 17/006 Compounds containing, besides germanium, two or more other elements, with the exception of oxygen or hydrogen
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2006/40 Electric properties
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An object of the present invention is to provide a sulfide solid electrolyte material having satisfactory ion conductivity. The present invention attains the object by providing a sulfide solid electrolyte material comprising a Li element, a Ge element, a P element, a S element, and an X element (X is at least one of F, Cl, Br and I), wherein the sulfide solid electrolyte material comprises a crystal phase A having a peak at the position of 2θ=29.58°±1.00° measured by X-ray diffractometry using CuKα ray, has a composition of y(LiX)·(100−y) (Li_3.35Ge_0.35P_0.65S₄) (y satisfies the relationship: 0<y<20), and the sulfide solid electrolyte material does not comprise a crystal phase B having a peak at the position of 2θ=25.20°±1.00° measured by X-ray diffractometry using CuKα ray.

Claims

1. A sulfide solid electrolyte material comprising a Li element, a Ge element, a P element, a S element, and an X element (X is at least one of F, Cl, Br, and I),

wherein the sulfide solid electrolyte material comprising a crystal phase A having a peak at a position of 2θ

=29.58°

±

1.00°

measured by X-ray diffractometry using CuKα

ray,

having a composition of y(LiX)·

(100−

y) (Li_3.35Ge_0.35P_0.65S₄) (y satisfies the relationship;

0<

y<

20), and

the sulfide solid electrolyte material does not comprise a crystal phase B having a peak at a position of 2θ

=25.20°

±

1.00°

measured by X-ray diffractometry using CuKα

ray.

2. The sulfide solid electrolyte material according to claim 1, wherein X is Br.

3. A battery comprising:

a cathode active material layer containing a cathode active material;

an anode active material layer containing an anode active material; and

an electrolyte layer formed between the cathode active material layer and the anode active material layer,

wherein at least one of the cathode active material layer, the anode active material layer and the electrolyte layer contains the sulfide solid electrolyte material according to claim 1.

4. A method for producing a sulfide solid electrolyte material, the sulfide solid electrolyte material being the sulfide solid electrolyte material according to claim 1, the method comprising steps of:

an ion conductive material synthesis step of synthesizing an amorphized ion conductive material by mechanical milling using a raw material composition containing a constituent component of the sulfide solid electrolyte material; and

a heating step of heating the amorphized ion conductive material, and thereby obtaining the sulfide solid electrolyte material.