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

• US 10,461,363 B2
• Filed: 06/08/2015
• Issued: 10/29/2019
• Est. Priority Date: 06/25/2014
• Status: Active Grant

• Current Assignee: Tokyo Institute of Technology (National University Corporation Tokyo Institute of Technology), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Tokyo Institute of Technology (National University Corporation Tokyo Institute of Technology)
• Inventors: Kanno, Ryoji, Hirayama, Masaaki, Suzuki, Kota, Hori, Satoshi, Kato, Yuki
• Primary Examiner(s): Vo, Jimmy
• Application Number:
  US15/319,317
• Publication Number:
  US 20170155168A1
• Time in Patent Office: 1,604 Days
• CPC Class Codes: C01B 17/22 Alkali metal sulfides or polysulfides
• CPC Class Codes: C01B 25/14 Sulfur, selenium, or tellurium compounds of phosphorus
• 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 10/0525 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 2300/0068 inorganic
• 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

A sulfide solid electrolyte material has favorable ion conductivity and resistance to reduction. The sulfide solid electrolyte material includes a peak at a position of 2θ=29.86°±1.00° in X-ray diffraction measurement using a CuKα ray, and a composition of Li_2y+3PS₄ (0.1≤y≤0.175).

Claims

1. A sulfide solid electrolyte material comprising:

a peak at a position of 2θ

=29.86°

±

1.00°

in X-ray diffraction measurement using a CuKα

ray, and

a composition of Li_2y+3PS₄(0.1≤

y≤

0.175).

2. The sulfide solid electrolyte material according to claim 1, further comprising a peak at a position of 2θ

=24.01°

±

1.00°

.

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 1.

6. 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:

an ion conductive material synthesizing step of synthesizing an ion conductive material not having Li₂S 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 ion conductive material.

7. The producing method for a sulfide solid electrolyte material according to claim 6, wherein a heating temperature in the heating step is in a range of 230°

C. to 300°

C.

3. A sulfide solid electrolyte material comprising:

an octahedron O comprising a Li element and a S element, a tetrahedron T₁ comprising a P element and a S element, and a tetrahedron T₂ comprising a P element and a S element;

the tetrahedron T₁ and the octahedron O sharing an edge, and the tetrahedron T₂ and the octahedron O containing a crystal structure sharing a corner, and

a composition of Li_2y+3PS₄(0.1≤

y≤

0.175).

5. 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 3.

8. A producing method for a sulfide solid electrolyte material, the sulfide solid electrolyte material being the sulfide solid electrolyte material according to claim 3, comprising:

an ion conductive material synthesizing step of synthesizing an ion conductive material not having Li₂S 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 ion conductive material.

9. The producing method for a sulfide solid electrolyte material according to claim 8, wherein a heating temperature in the heating step is in a range of 230°

C. to 300°

C.