Solid electrolyte having magnesium ion conductivity and magnesium secondary battery using the same

Patent metadata

Field	Value
Publication number	US-11133526-B2
Application number	US-201715658313-A
Country	US
Kind code	B2
Filing date	Jul 24, 2017
Priority date	Dec 7, 2016
Publication date	Sep 28, 2021
Grant date	Sep 28, 2021

Abstract

A solid electrolyte has a composition represented by the formula: MgxMySiOz, where M represents at least one selected from the group consisting of Ti, Zr, Hf, Ca, Sr, and Ba; x satisfies 0<x<2; y satisfies 0<y<2; and z satisfies 3<z<6.

First claim

What is claimed is:

1. A solid electrolyte having a composition represented by a formula:
Mg x M y SiO z , where M represents at least one selected from the group consisting of Zr, Hf, Ca, Sr, and Ba; x satisfies 0<x<2; y satisfies 0<y<2; x and y satisfy 0.5<y/(x+y)<1; z satisfies 3<z<6; being a film having a thickness of 100 nm or more and 20 pm or less.

2. A secondary battery comprising:
a positive electrode containing a positive electrode active material;
a negative electrode containing a negative electrode active material; and
a solid electrolyte having a composition represented by a formula:
Mg x M y SiO z , where M represents at least one selected from the group consisting of Zr, Hf, Ca, Sr, and Ba; x satisfies 0<x<2; y satisfies 0<y<2; x and y satisfy 0.5<y/(x+y)<1; z satisfies 3<z<6.

3. The secondary battery according to claim 2 , wherein M represents at least one selected from the group consisting of Ca, Sr, and Ba.

4. The secondary battery according to claim 2 , wherein M represents Ca.

5. The secondary battery according to claim 2 , being an amorphous material.

6. The secondary battery according to claim 2 , wherein the positive electrode, the solid electrolyte, and the negative electrode are stacked.

7. The secondary battery according to claim 2 , further comprising:
an electrolytic solution filling the space between the positive electrode and the negative electrode and containing a nonaqueous solvent and a magnesium salt dissolved in the nonaqueous solvent, wherein the solid electrolyte covers the positive electrode.

8. The secondary battery according to claim 7 , wherein the positive electrode includes a positive electrode active material layer containing a plurality of positive electrode active material particles; and
the solid electrolyte is disposed as a single layer collectively covering the plurality of the positive electrode active material particles.

9. The secondary battery according to claim 7 , wherein
the Positive electrode includes a positive electrode active material layer containing a plurality of positive electrode active material particles; and
the solid electrolyte is composed of a plurality of coats individually covering the plurality of the positive electrode active material particles.

10. A secondary battery comprising:
a positive electrode containing a positive electrode active material;
a negative electrode containing a negative electrode active material;
a solid electrolyte having a composition represented by a formula: Mg x Zr y SiO z , where; x satisfies 0<x<2; y satisfies 0<y<2; and z satisfies 3<z<6; and
an electrolytic solution filling the space between the positive electrode and the negative electrode and containing a nonaqueous solvent and a magnesium salt dissolved in the nonaqueous solvent,
wherein the solid electrolyte covers the positive electrode.

11. The secondary battery according to claim 10 , being an amorphous material.

12. The secondary battery according to claim 10 , being a film having a thickness of 100 nm or more and 20 pm or less.

13. The secondary battery according to claim 10 , wherein the positive electrode includes a positive electrode active material layer containing a plurality of positive electrode active material particles; and the solid electrolyte is composed of a plurality of coats individually covering the plurality of the positive electrode active material particles.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Fujinoki Norihito
• Tsujita Takuji
• Nishitani Yu
• Tomiyama Morio

Classifications

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/366

  as layered products · CPC title

• H01M10/054

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

• H01M10/056 Primary

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title