Solid electrolyte having magnesium ion conductivity, and magnesium secondary battery containing the same

Patent metadata

Field	Value
Publication number	US-11081725-B2
Application number	US-201916366412-A
Country	US
Kind code	B2
Filing date	Mar 27, 2019
Priority date	May 9, 2018
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A solid electrolyte comprises a compound represented by a formula MgxAl2-yMyOz, where M is at least one selected from the group consisting of Si, Ge, Sn, Pb, Ti, and Zr; 0<x<1; 0.125≤y≤0.5; and 3.8≤z≤4.1.

First claim

What is claimed is:

1. A magnesium secondary battery comprising:
a positive electrode;
a negative electrode; and
a solid electrolyte having magnesium ion conductivity,
wherein the solid electrolyte comprises: a compound represented by a formula Mg x Al 2-y M y O z , where M is at least one selected from the group consisting of Si, Ge, Sn, Pb, Ti, and Zr; 0<x<1; 0.125≤y≤0.5; and 3.8≤z≤4.1.

2. The magnesium secondary battery according to claim 1 ,
wherein M is Si.

3. The magnesium secondary battery according to claim 1 ,
wherein M is Ti.

4. The magnesium secondary battery according to claim 1 ,
wherein the compound has magnesium vacancies.

5. The magnesium secondary battery according to claim 1 ,
wherein the compound has a single-phase structure.

6. The magnesium secondary battery according to claim 1 ,
wherein the compound is amorphous.

7. The magnesium secondary battery according to claim 1 ,
wherein the positive electrode, the solid electrolyte, and the negative electrode are stacked in that order.

8. The magnesium secondary battery according to claim 1 , further comprising:
an electrolyte solution having magnesium ion conductivity,
wherein the solid electrolyte covers the positive electrode, and
the electrolyte solution fills a space between the negative electrode and the solid electrolyte.

9. The magnesium secondary battery according to claim 8 ,
wherein the positive electrode includes a positive electrode active material layer containing positive electrode active material particles, and
the solid electrolyte is in a form of a layer which is placed on the positive electrode active material layer and which collectively covers the positive electrode active material particles.

10. The magnesium secondary battery according to claim 9 ,
wherein the positive electrode active material layer has an irregular surface defined by the positive electrode active material particles and,
the solid electrolyte is disposed along the irregular surface.

11. The magnesium secondary battery according to claim 8 ,
wherein the positive electrode includes a positive electrode active material layer containing positive electrode active material particles, and
the solid electrolyte is in a form of coatings respectively covering the positive electrode active material particles.

12. The magnesium secondary battery according to claim 1 , further comprising:
an electrolyte solution having magnesium ion conductivity,
wherein the solid electrolyte covers the negative electrode, and
the electrolyte solution fills a space between the positive electrode and the solid electrolyte.

13. The magnesium secondary battery according to claim 12 ,
wherein the negative electrode includes a negative electrode active material layer containing negative electrode active material particles, and
the solid electrolyte is in a form of a layer which is placed on the negative electrode active material layer and which collectively covers the negative electrode active material particles.

14. The magnesium secondary battery according to claim 13 ,
wherein the negative electrode active material layer has an irregular surface defined by the negative electrode active material particles, and
the solid electrolyte is disposed along the irregular surface.

15. The magnesium secondary battery according to claim 12 ,
wherein the negative electrode includes a negative electrode active material layer containing negative electrode active material particles, and
the solid electrolyte is in a form of coatings respectively covering the negative electrode active material particles.

16. The magnesium secondary battery according to claim 1 ,
wherein 0.56≤x<1.

17. The magnesium secondary battery according to claim 1 ,
wherein M is at least one selected from the group consisting of Si, Ge, Pb, Ti, and Zr.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Ichikawa Kazuhide
• Nishitani Yu
• Adachi Hideaki
• Tsujita Takuji
• Matsunaka Daisuke

Classifications

• H01M10/0562

  Solid materials · CPC title

• H01M10/054 Primary

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/366

  as layered products · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title