Sulfide solid electrolyte material, battery, and producing method for sulfide solid electrolyte material

Patent metadata

Field	Value
Publication number	US-9748603-B2
Application number	US-201415024989-A
Country	US
Kind code	B2
Filing date	Sep 17, 2014
Priority date	Oct 2, 2013
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A sulfide solid electrolyte material includes Li, K, Si, P and S elements; a peak at 2θ=29.58°±0.50° and not having a peak at a position of 2θ=27.33°±0.50° in X-ray diffraction measurement using a CuKα ray, or when a diffraction intensity at the peak of 2θ=29.58°±0.50° is regarded as I A and a diffraction intensity at the peak of 2θ=27.33°±0.50° is regarded as I B having a peak at the position of 2θ=27.33°±0.50°, a value of I B /I A is less than 1; a P element molar fraction (P/(Si+P)) to a Si element total and the P element satisfies 0.5≦P/(Si+P)≦0.7, and a K element molar fraction (K/(Li+K)) to a Li element total and the K element satisfies 0<K/(Li+K)≦0.1.

First claim

What is claimed is:

1. A sulfide solid electrolyte material comprising: a Li element, a K element, a Si element, a P element and a S element;
having a peak at a position of 2θ=29.58°±0.50° in X-ray diffraction measurement using a CuKα ray;
not having a peak at a position of 2θ=27.33°±0.50° in X-ray diffraction measurement using a CuKα ray, or
when a diffraction intensity at the peak of 2θ=29.58°±0.50° is regarded as I A and a diffraction intensity at the peak of 2θ=27.33°±0.50° is regarded as I B in a case of having the peak at the position of 2θ=27.33°±0.50°, a value of I B /I A being less than 1;
a molar fraction (P/(Si+P)) of the P element to a total of the Si element and the P element satisfying 0.5≦P/(Si+P)≦0.7; and
a molar fraction (K/(Li+K)) of the K element to a total of the Li element and the K element satisfying 0.05≦K/(Li+K)≦0.1.

2. A sulfide solid electrolyte material comprising: an octahedron O comprising a Li element and a S element, a tetrahedron T 1 comprising an M a element and a S element, and a tetrahedron T 2 comprising an M b element and a S element, the tetrahedron T 1 and the octahedron O sharing an edge, and the tetrahedron T 2 and the octahedron O containing a crystal structure sharing a corner as a main body,
at least one of the M a element and the M b element containing a Si element;
at least one of the M a element and the M b element containing a P element;
at least one of the octahedrons O is such that part of the Li element bonding to the S element being substituted with a K element;
a molar fraction (P/(Si+P)) of the P element to a total of the Si element and the P element satisfying 0.5≦P/(Si+P)≦0.7; and
a molar fraction (K/(Li+K)) of the K element to a total of the Li element and the K element satisfying 0.05<K/(Li+K)≦0.1.

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 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 2 .

5. A producing method for a sulfide solid electrolyte material, the sulfide solid electrolyte material being the sulfide solid electrolyte material according to claim 1 , comprising steps of:
an ion conductive material synthesizing step of synthesizing an amorphized ion conductive material using a raw material composition containing a constituent of the sulfide solid electrolyte material by mechanical milling; and
a heating step of obtaining the sulfide solid electrolyte material by heating the amorphized ion conductive material.

6. A producing method for a sulfide solid electrolyte material, the sulfide solid electrolyte material being the sulfide solid electrolyte material according to claim 2 , comprising steps of:
an ion conductive material synthesizing step of synthesizing an amorphized ion conductive material using a raw material composition containing a constituent of the sulfide solid electrolyte material by mechanical milling; and
a heating step of obtaining the sulfide solid electrolyte material by heating the amorphized ion conductive material.

Assignees

• Toyota Motor Co Ltd

Inventors

• Yamasaki Hisatsugu
• Kato Yuki
• Ohtomo Takamasa
• Kawakami Masatsugu

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01B1/10

  sulfides · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title