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

Patent metadata

Field	Value
Publication number	US-10355308-B2
Application number	US-201414896281-A
Country	US
Kind code	B2
Filing date	May 29, 2014
Priority date	Jun 7, 2013
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

The present invention aims to provide a sulfide solid electrolyte material with favorable ion conductivity, in which charge and discharge efficiency may be inhibited from decreasing. The object is attained by providing a sulfide solid electrolyte material, including: a Li element; a P element; and a S element, characterized in that the material has a peak at a position of 2θ=30.21°±0.50° in X-ray diffraction measurement using a CuKα ray, and the sulfide solid electrolyte material does not substantially include a metallic element belonging to the third group to the sixteenth group.

First claim

What is claimed is:

1. A sulfide solid electrolyte material, comprising: a Li element; a P element; and a S element, wherein
the sulfide solid electrolyte material has a crystal phase A containing peaks at positions of 2θ=17.69°±0.50°, 20.60°±0.50°, 24.60°±0.50°, 27.62°±0.50° and 30.21°±0.50° in X-ray diffraction measurement using a CuKαray,
the sulfide solid electrolyte material optionally has a crystal phase B containing peaks at least at positions of 2θ=18.12° ±0.50° , 27.33° ±0.50° and 29.16° ±0.50 in X-ray diffraction measurement using a CuKαray,
the sulfide solid electrolyte material does not substantially comprise a metallic element belonging to a third group to a sixteenth group of the periodic table of elements, the sulfide solid electrolyte material comprises a composition of Li 5x+2y+3 P 1−x S 4 (0≤x≤0.2, 0<y≤0.3), and
either the sulfide solid electrolyte material does not have the crystal phase B, or
in the case where the sulfide solid electrolyte material has the crystal phase B, and diffraction intensity at the peak of 2θ=30.21° ±0.50° is regarded as I A and diffraction intensity at the peak of 2θ=27.33° ±0.50° is regarded as I B , a value of I B /I A is greater than 0 and less than 0.50.

2. 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 .

3. 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 by melt extraction while using a raw material composition containing a constituent of the sulfide solid electrolyte material; and
a heating step of obtaining the sulfide solid electrolyte material by heating the amorphized ion conductive material.

4. The sulfide solid electrolyte material according to claim 1 , wherein I B /I A is 0 or more and 0.25 or less.

5. The sulfide solid electrolyte material according to claim 1 , wherein I B /I A is 0 or more and 0.15 or less.

6. The sulfide solid electrolyte material according to claim 1 , wherein the molar ratio of the metallic element to the P element, is 0 or more and 0.08 or less.

7. The sulfide solid electrolyte material according to claim 1 , wherein the molar ratio of the metallic element to the P element, is 0 or more and 0.05 or less.

8. The sulfide solid electrolyte material according to claim 1 , wherein I B /I A is 0 or more and 0.07 or less.

9. The sulfide solid electrolyte material according to claim 1 , which does not have the crystal phase B.

10. A sulfide solid electrolyte material comprising a crystal structure containing an octahedron O composed of a Li element and a S element; a tetrahedron T 1 composed of a P element and a S element; and a tetrahedron T 2 composed of a P element and a S element,
wherein the tetrahedron T 1 and the octahedron O share an edge, and the tetrahedron T 2 and the octahedron O share a corner,
the sulfide solid electrolyte material does not substantially comprise a metallic element belonging to a third group to a sixteenth group of the periodic table of elements, the sulfide solid electrolyte material comprises a composition of Li 5x+2y+3 P 1−x S 4 (0≤x≤0.2, 0 <y≤0.3),
the sulfide solid electrolyte material has a crystal phase A containing a peak at a position of 30.21° ±0.50° in X-ray diffraction measurement using a CuKαray,
the sulfide solid electrolyte material optionally has a crystal phase B containing peaks at least at positions of 2θ=18.12° ±0.50° , 27.33° ±0.50° and 29.16° ±0.50 in X-ray diffraction measurement using a CuKαray,
either the sulfide solid electrolyte material does not have the crystal phase B, or
in the case where the sulfide solid electrolyte material has the crystal phase B, and diffraction intensity at the peak of 2θ=30.21° ±0.50° is regarded as I A and diffraction intensity at the peak of 2θ=27.33° ±0.50° is regarded as I B , a value of I B /I A is greater than 0 and less than 0.50.

11. 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 10 .

12. A producing method for a sulfide solid electrolyte material, the sulfide solid electrolyte material being the sulfide solid electrolyte material according to claim 10 , comprising steps of:
an ion conductive material synthesizing step of synthesizing an amorphized ion conductive material by melt extraction while using a raw material composition containing a constituent of the sulfide solid electrolyte material; and
a heating step of obtaining the sulfide solid electrolyte material by heating the amorphized ion conductive material.

13. The sulfide solid electrolyte material according to claim 10 , wherein I B /I A is 0 or more and 0.25 or less.

14. The sulfide solid electrolyte material according to claim 10 , wherein I B /I A is 0 or more and 0.15 or less.

15. The sulfide solid electrolyte material according to claim 10 , wherein the molar ratio of the metallic element to the P element, is 0 or more and 0.08 or less.

16. The sulfide solid electrolyte material according to claim 10 , wherein the molar ratio of the metallic element to the P element, is 0 or more and 0.05 or less.

17. The sulfide solid electrolyte material according to claim 10 , wherein I B /I A is 0 or more and 0.07 or less.

18. The sulfide solid electrolyte material according to claim 10 , which does not have the crystal phase B.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kanno Ryoji
• Hirayama Masaaki
• Kato Yuki
• Ohtomo Takamasa
• Yamasaki Hisatsugu

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M2220/30

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

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title