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

• US 9,748,603 B2
• Filed: 09/17/2014
• Issued: 08/29/2017
• Est. Priority Date: 10/02/2013
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Yamasaki, Hisatsugu, Kato, Yuki, Ohtomo, Takamasa, Kawakami, Masatsugu
• Primary Examiner(s): Marks, Jacob
• Application Number:
  US15/024,989
• Publication Number:
  US 20160240886A1
• Time in Patent Office: 1,077 Days
• CPC Class Codes: H01B 1/10 sulfides
• 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: Y02E 60/10 Energy storage using batteries

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.

Claims

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.

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.

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.

2. A sulfide solid electrolyte material comprising:

an octahedron O comprising a Li element and a S element, a tetrahedron T₁ comprising an M_a element and a S element, and a tetrahedron T₂ comprising an M_b 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 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.

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.

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.