Solid electrolyte and all solid state battery

Patent metadata

Field	Value
Publication number	US-12438187-B2
Application number	US-202418592805-A
Country	US
Kind code	B2
Filing date	Mar 1, 2024
Priority date	Aug 30, 2017
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A solid electrolyte that includes a lithium ion conductive material having a garnet-type structure, a lithium ion conductive material having a LISICON-type structure, and a compound containing Li and B.

First claim

The invention claimed is:

1. A solid electrolyte comprising:
a first lithium ion conductive material having a garnet-type structure;
a second lithium ion conductive material having a LISICON-type structure, wherein the second lithium ion conductive material having the LISICON-type structure excludes Li 4 SiO 4 ; and
an oxide containing Li and B,
wherein, when a volume ratio of the lithium ion conductive material having the garnet-type structure is X, a volume ratio of the lithium ion conductive material having the LISICON-type structure is Y, and a volume ratio of the compound containing Li and B is Z, 10%≤X≤89.5%, 10%≤Y≤89.5%, 0.5%≤Z≤30%, and X+Y+Z≤100%.

2. The solid electrolyte according to claim 1 , wherein 37%≤X≤70%, 20%≤Y≤60%, 3.0%≤Z≤20%, and 80%≤X+Y+Z≤100%.

3. The solid electrolyte according to claim 2 , wherein the lithium ion conductive material having the LISICON-type structure is represented by (Li [3−ax+(5−b)] A x )MO 4 , wherein A is at least one element selected from the group consisting of Mg, Al, Ga and Zn, Mis at least one element selected from the group consisting of Zn, Al, Ga, Si, Ge, Ti, P and V, 0≤x≤1.0, a is an average valence of A, and b is an average valence of M.

4. The solid electrolyte according to claim 3 , wherein the lithium ion conductive material having the garnet-type structure is represented by (Li [7−ax−(b-4)y] A x )La 3 Zr (2−y) β y O 12 , wherein A is at least one element selected from the group consisting of Ga, Al, Mg, Zn and Sc, β is at least one element selected from the group consisting of Nb, Ta, W, Te, Mo and Bi, 0≤x≤0.5, 0≤y≤2.0, a is an average valence of A, and b is an average valence of β.

5. The solid electrolyte according to claim 1 , wherein the lithium ion conductive material having the LISICON-type structure is represented by (Li [3−ax+(5−b)] A x )MO 4 , wherein A is at least one element selected from the group consisting of Mg, Al, Ga and Zn, M is at least one element selected from the group consisting of Zn, Al, Ga, Si, Ge, Ti, P and V, 0≤x≤1.0, a is an average valence of A, and b is an average valence of M.

6. The solid electrolyte according to claim 5 , wherein the lithium ion conductive material having the garnet-type structure is represented by (Li [7−ax−(b-4)y] A x )La 3 Zr (2−y) β y O 12 , wherein A is at least one element selected from the group consisting of Ga, Al, Mg, Zn and Sc, β is at least one element selected from the group consisting of Nb, Ta, W, Te, Mo and Bi, 0≤x≤0.5, 0≤y≤2.0, a is an average valence of A, and b is an average valence of β.

7. The solid electrolyte according to claim 1 , wherein the lithium ion conductive material having the garnet-type structure is represented by (Li [7−ax−(b-4)y] A x )La 3 Zr (2−y) β y O 12 , wherein A is at least one element selected from the group consisting of Ga, Al, Mg, Zn and Sc, β is at least one element selected from the group consisting of Nb, Ta, W, Te, Mo and Bi, 0≤x≤0.5, 0≤y≤2.0, a is an average valence of A, and b is an average valence of β.

8. The solid electrolyte according to claim 1 , wherein a molar ratio of Li to B is 2.0 to 6.5.

9. An all solid state battery comprising:
a positive electrode;
a negative electrode; and
a solid electrolyte layer between the positive electrode and the negative electrode, the solid electrolyte layer including the solid electrolyte according to claim 1 .

Assignees

• Murata Manufacturing Co

Inventors

• TAKANO Ryohei
• Yoshioka Makoto
• Ito Akisuke
• Ishikura Takeo

Classifications

• H01M50/431

  Inorganic material · CPC title

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M2300/0071

  Oxides · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M50/434

  Ceramics · CPC title