Solid electrolyte material and battery

Patent metadata

Field	Value
Publication number	US-2019088995-A1
Application number	US-201816198762-A
Country	US
Kind code	A1
Filing date	Nov 22, 2018
Priority date	Aug 4, 2016
Publication date	Mar 21, 2019
Grant date	—

Abstract

A solid electrolyte material according to an aspect of the present disclosure is represented by the following Compositional Formula (1):
Li 6-3z Y z X 6
where, 0<z<2 is satisfied; and X represents Cl or Br.

First claim

What is claimed is:

1 . A solid electrolyte material represented by the following Compositional Formula (1):
Li 6-3z Y z X 6 where 0<z<2 is satisfied; and X represents Cl or Br.

2 . The solid electrolyte material according to claim 1 , wherein
0.75≤z≤1.5 is satisfied.

3 . The solid electrolyte material according to claim 2 , wherein
1≤z≤1.25 is satisfied.

4 . The solid electrolyte material according to claim 1 , wherein
the solid electrolyte material includes at least one first crystal phase; and in the first crystal phase, the arrangement of halogen X is the same as that of Br in Li 3 ErBr 6 having a crystal structure belonging to space group C2/m.

5 . The solid electrolyte material according to claim 4 , wherein
I LEB(200) denoting an X-ray diffraction intensity of a plane of the first crystal phase corresponding to a (200) plane of the Li 3 ErBr 6 crystal structure, and I LEB(110) denoting an X-ray diffraction intensity of a plane of the first crystal phase corresponding to a (100) plane of the Li 3 ErBr 6 crystal structure satisfy:
I LEB(110) /I LEB(200) <0.01.

6 . The solid electrolyte material according to claim 4 , wherein
FWHM 1 denoting a full width at half maximum of an X-ray diffraction peak of a plane of the first crystal phase corresponding to a (200) plane of the Li 3 ErBr 6 crystal structure, and 2 θc 1 denoting a diffraction angle at the center of the X-ray diffraction peak satisfy:
FWHM 1 /2 θc 1 ≥0.015.

7 . The solid electrolyte material according to claim 4 , wherein
the solid electrolyte material includes a heterogeneous crystal phase having a crystal structure different from that of the first crystal phase; and the heterogeneous crystal phase lies between the first crystal phases.

8 . The solid electrolyte material according to claim 4 , wherein
the solid electrolyte material includes an amorphous phase; and the amorphous phase lies between the first crystal phases.

9 . The solid electrolyte material according to claim 1 , wherein
the solid electrolyte material includes at least one second crystal phase; and in the second crystal phase, the arrangement of halogen X is the same as that of Cl in Li 3 ErCl 6 having a crystal structure belonging to space group P-3m1.

10 . The solid electrolyte material according to claim 9 , wherein
I LEC(303) denoting an X-ray diffraction intensity of a plane of the second crystal phase corresponding to a (303) plane of the Li 3 ErCl 6 crystal structure, and I LEC(110) denoting an X-ray diffraction intensity of a plane of the second crystal phase corresponding to a (110) plane of the Li 3 ErCl 6 crystal structure satisfy:
I LEC(110) /I LEC(303) <0.3.

11 . The solid electrolyte material according to claim 9 , wherein
FWHM 2 denoting a full width at half maximum of an X-ray diffraction peak of a plane of the second crystal phase corresponding to a (303) plane of the Li 3 ErCl 6 crystal structure, and 2 θc 2 denoting a diffraction angle at the center of the X-ray diffraction peak satisfy:
FWHM 2 /2 θ c 2 ≥0.015.

12 . The solid electrolyte material according to claim 9 , wherein
the solid electrolyte material includes a heterogeneous crystal phase having a crystal structure different from that of the second crystal phase; and the heterogeneous crystal phase lies between the second crystal phases.

13 . The solid electrolyte material according to claim 9 , wherein
the solid electrolyte material includes an amorphous phase; and the amorphous phase lies between the second crystal phases.

14 . The solid electrolyte material according to claim 1 , wherein
the solid electrolyte material includes at least one third crystal phase; and in the third crystal phase, the arrangement of halogen X is the same as that of Cl in Li 3 YbCl 6 having a crystal structure belonging to space group Pnma.

15 . The solid electrolyte material according to claim 14 , wherein
FWHM 3 denoting a full width at half maximum of an X-ray diffraction peak of a plane of the third crystal phase corresponding to a (231) plane of the Li 3 YbCl 6 crystal structure, and 2 θc 3 denoting a diffraction angle at the center of the X-ray diffraction peak satisfy:
FWHM 3 /2 θc 3 ≥0.015.

16 . The solid electrolyte material according to claim 14 , wherein
the solid electrolyte material includes a heterogeneous crystal phase having a crystal structure different from that of the third crystal phase; and the heterogeneous crystal phase lies between the third crystal phases.

17 . The solid electrolyte material according to claim 14 , wherein
the solid electrolyte material includes an amorphous phase; and the amorphous phase lies between the third crystal phases.

18 . The solid electrolyte material according to claim 1 , wherein
X represents Br; the solid electrolyte material includes at least one fourth crystal phase; and the fourth crystal phase shows, in structural analysis of the fourth crystal phase through X-ray diffractometry by a θ-2θ method using Cu—Kα rays having wavelengths of 1.5405 angstrom and 1.5444 angstrom as the X-ray, peaks within ranges of diffraction angle 2θ values of 13.1° to 14.5°, 26.6° to 28.3°, 30.8° to 32.7°, 44.2° to 47.1°, 52.3° to 55.8°, and 54.8° to 58.5°.

19 . The solid electrolyte material according to claim 18 , wherein
FWHM 4 denoting a full width at half maximum of the X-ray diffraction peak observed within the range of 26.6° to 28.3° in the X-ray diffractometry using Cu—Kα rays, and 2 θc 4 denoting a diffraction angle at the center of the X-ray diffraction peak satisfy:
FWHM 4 /2 θc 4 ≥0.015.

20 . The solid electrolyte material according to claim 18 , wherein
in the X-ray diffractometry using Cu—Kα rays, I 1 denoting an intensity of the diffraction peak appearing within the range of 26.6° to 28.3° and I 2 denoting an intensity of the diffraction peak appearing within a range of 15.0° to 16.0° satisfy:
I 2 /I 1 <0.01.

21 . The solid electrolyte material according to claim 18 , wherein
the solid electrolyte material includes a heterogeneous crystal phase having a crystal structure different from that of the fourth crystal phase; and the heterogeneous crystal phase lies between the fourth crystal phases.

22 . The solid electrolyte material according to claim 18 , wherein
the solid electrolyte material includes an amorphous phase; and the amorphous phase lies between the fourth crystal phases.

23 . The solid electrolyte material according to claim 1 , wherein
X represents Cl; the solid electrolyte material includes at least one fifth crystal phase; and the fifth crystal phase shows, in structural analysis of the fifth crystal phase through X-ray diffractometry by a θ-2θ method using Cu—Kα rays having wavelengths of 1.5405 angstrom and 1.5444 angstrom as the X-ray, peaks within ranges of diffraction angle 2θ values of 15.3° to 16.3°, 29.8° to 32°, 38.5° to 41.7°, 46.3° to 50.4°, and 50.8° to 55.4°.

24 . The solid electrolyte material according to claim 23 , wherein
FWHM 5 denoting a full width at half maximum of the X-ray diffraction peak observed within the range of 29.8° to 32° in the X-ray diffractometry using Cu—Kα rays, and 2 θc 5 denoting a diffraction angle at the center of the X-ray diffraction peak satisfy:
FWHM 5 /2 θc 5 ≥0.015.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Asano Tetsuya
• Sakai Akihiro
• Ohuchi Satoru
• SAKAIDA Masashi
• Miyazaki Akinobu
• Hasegawa Shinya

Classifications

• H01M10/052

  Li-accumulators · CPC title

• C01F17/36

  halogen being the only anion, e.g. NaYF4 · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• H01M2300/008

  Halides · CPC title