Cathode mixture, all-solid-state battery, and method of producing cathode mixture

Patent metadata

Field	Value
Publication number	US-2020313231-A1
Application number	US-202016819803-A
Country	US
Kind code	A1
Filing date	Mar 16, 2020
Priority date	Mar 25, 2019
Publication date	Oct 1, 2020
Grant date	—

Abstract

A cathode mixture having a low irreversible capacity is disclosed. The cathode mixture contains: a cathode active material having a S element; a sulfur-containing compound having a B element and a S element; and a conductive additive, wherein the cathode mixture does not substantially have a Li element, and a standard value that is defined by the following formula is at least 0.56 when the diffracted intensity at 11.5° in 2θ is defined as I 11.5 , the diffracted intensity at 23.1° in 2θ is defined as I 23.1 , and the diffracted intensity at 40° in 2θ is defined as I 40 in the X-ray diffraction measurement using CuKα radiation:
standard value=( I 11.5 −I 40 )/( I 23.1 −I 40 ).

First claim

What is claimed is:

1 . A cathode mixture comprising:
a cathode active material having a S element; a sulfur-containing compound having a B element and a S element; and a conductive additive, wherein the cathode mixture does not substantially have a Li element, and a standard value that is defined by the following formula is at least 0.56 when a diffracted intensity at 11.5° in 2θ is defined as I 11.5 , a diffracted intensity at 23.1° in 2θ is defined as I 23.1 , and a diffracted intensity at 40° in 2θ is defined as I 40 in X-ray diffraction measurement using CuKα radiation:
standard value=( I 11.5 −I 40 )/( I 23.1 −I 40 ).

2 . The cathode mixture according to claim 1 , wherein a molar ratio B/S of the B element to the S element is 0.44 to 1.60.

3 . The cathode mixture according to claim 1 , wherein the standard value is at most 1.08.

4 . The cathode mixture according to claim 1 , wherein the cathode mixture does not substantially have a P element.

5 . The cathode mixture according to claim 1 , wherein the conductive additive is a carbon material.

6 . An all-solid-state battery comprising:
a cathode mixture layer constituted of the cathode mixture according to claim 1 ; an anode active material layer; and a solid electrolyte layer arranged between the cathode mixture layer and the anode active material layer.

7 . A method of producing a cathode mixture, the method comprising:
a preparing step of preparing a raw material containing a cathode active material having a S element, a sulfide having a B element and a S element, and a conductive additive, and not substantially having a Li element; and a mixing step of mixing the raw material to obtain the cathode mixture, wherein the cathode mixture containing the cathode active material having the S element, a sulfur-containing compound having the B element and the S element, and the conductive additive, and not substantially having the Li element is obtained by adjusting mixing conditions for the raw material in the mixing step, a standard value of the cathode mixture being at least 0.56, the standard value being defined by the following formula when a diffracted intensity at 11.5° in 2θ is defined as I 11.5 , a diffracted intensity at 23.1° in 2θ is defined as I 23.1 , and a diffracted intensity at 40° in 2θ is defined as I 40 in X-ray diffraction measurement using CuKα radiation:
standard value=( I 11.5 −I 40 )/( I 23.1 −I 40 ).

8 . The method according to claim 7 , wherein in the mixing step, the raw material is mixed by mechanical milling.

Assignees

• Toyota Motor Co Ltd

Inventors

• Takeuchi Kazuya
• Nose Masafumi

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/364 Primary

  as mixtures · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M10/052

  Li-accumulators · CPC title