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

• US 9,761,908 B2
• Filed: 09/10/2014
• Issued: 09/12/2017
• Est. Priority Date: 09/26/2013
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Kato, Yuki
• Primary Examiner(s): Ruddock, Ula C
• Assistant Examiner(s): Lewis, Ben
• Application Number:
  US14/911,662
• Publication Number:
  US 20160197374A1
• Time in Patent Office: 1,098 Days
• CPC Class Codes: C01B 17/22 Alkali metal sulfides or polysulfides
• CPC Class Codes: H01B 1/10 sulfides
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 2300/0065 Solid electrolytes
• CPC Class Codes: H01M 2300/0068 inorganic
• 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 with favorable reduction-resistance has a second structural part formed to cover a plurality of first structural parts, a first ion conductor composing the first structural part has a specific crystal phase with favorable ion conductivity, and a weight ratio γ of an Me element to a P element in the second structural part is less than 0.72.

Claims

1. A sulfide solid electrolyte material comprising a Li element, an Me element (Me is at least one kind selected from the group consisting of Sb, Si, Ge, Sn, B, Al, Ga, In, Ti, Zr, V and Nb), a P element and a S element, wherein the sulfide solid electrolyte material comprises:

a first structural part composed of a first ion conductor containing the Li element, the Me element, the P element and the S element; and

a second structural part composed of a second ion conductor containing the Li element, the Me element, the P element and the S element,

wherein the second structural part is formed to cover a plurality of the first structural parts;

the first ion conductor has a peak at a position of 2θ

=29.58°

±

0.50°

in X-ray diffraction measurement using a CuKα

ray;

does not have a peak at a position of 2θ

=27.33°

±

0.50°

in X-ray diffraction measurement using a CuKα

ray or when diffraction intensity at the peak of 2θ

=29.58°

±

0.50°

is regarded as I_A and 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 is less than 0.50; and

a weight ratio γ

of the Me element to the P element in the second structural part is less than 0.72.

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 mechanical milling while using a raw material composition containing a constituent of the sulfide solid electrolyte material; and

a heating and quenching step of heating and quenching the amorphized ion conductive material,

wherein a heating temperature in the heating and quenching step is within the range of 650°

C. to 800°

C.

4. A sulfide solid electrolyte material comprising a Li element, an Me element (Me is at least one kind selected from the group consisting of Sb, Si, Ge, Sn, B, Al, Ga, In, Ti, Zr, V and Nb), a P element and a S element, wherein the sulfide solid electrolyte material comprises:

a first structural part composed of a first ion conductor containing the Li element, the Me element, the P element and the S element; and

a second structural part composed of a second ion conductor containing the Li element, the Me element, the P element and the S element,

wherein the second structural part is formed to cover a plurality of the first structural parts;

the first ion conductor has a peak at a position of 2θ

=29.58°

±

0.50°

in X-ray diffraction measurement using a CuKα

ray;

does not have a peak at a position of 2θ

=27.33°

±

0.50°

in X-ray diffraction measurement using a CuKα

ray or when diffraction intensity at the peak of 2θ

=29.58°

±

0.50°

is regarded as I_A and 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 is less than 0.50; and

a content of the Me element in the second structural part is smaller than a content of the Me element in the first structural part.

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 4.

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

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

a heating and quenching step of heating and quenching the amorphized ion conductive material,

wherein a heating temperature in the heating and quenching step is within the range of 650°

C. to 800°

C.