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

Patent metadata

Field	Value
Publication number	US-2016197374-A1
Application number	US-201414911662-A
Country	US
Kind code	A1
Filing date	Sep 10, 2014
Priority date	Sep 26, 2013
Publication date	Jul 7, 2016
Grant date	—

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

First claim

1 - 4 . (canceled)

5 . 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 CuKa 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.

6 . 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.

7 . 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 5 .

8 . 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 6 .

9 . A producing method for a sulfide solid electrolyte material, the sulfide solid electrolyte material being the sulfide solid electrolyte material according to claim 5 , 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.

10 . A producing method for a sulfide solid electrolyte material, the sulfide solid electrolyte material being the sulfide solid electrolyte material according to claim 6 , 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.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kato Yuki

Classifications

• H01B1/10

  sulfides · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C01B17/22

  Alkali metal sulfides or polysulfides · CPC title