Fluoride ion conductor containing potassium, alkaline earth metal, and fluorine, and fluoride ion secondary battery including the same

Patent metadata

Field	Value
Publication number	US-10944099-B2
Application number	US-201816216173-A
Country	US
Kind code	B2
Filing date	Dec 11, 2018
Priority date	Dec 28, 2017
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

A fluoride ion conductor contains potassium, at least one alkaline earth metal selected from the group consisting of calcium, barium, and strontium, and fluorine. The fluoride ion conductor includes a phase of a compound containing potassium, at least one alkaline earth metal, and fluorine.

First claim

What is claimed is:

1. A fluoride ion conductor comprising:
a compound containing potassium, at least one alkaline earth metal, and fluorine, wherein:
the at least one alkaline earth metal is selected from the group consisting of calcium, barium, and strontium,
the at least one alkaline earth metal includes calcium, and
in an average composition of the fluoride ion conductor, a ratio of a mole number of the at least one alkaline earth metal to a total mole number of the potassium and the at least one alkaline earth metal is 0.2 or more and 0.3 or less.

2. The fluoride ion conductor according to claim 1 , further comprising:
a mixture containing potassium, the at least one alkaline earth metal, and fluorine.

3. The fluoride ion conductor according to claim 1 , wherein
the compound consists of: potassium, the at least one alkaline earth metal, and fluorine.

4. The fluoride ion conductor according to claim 3 , wherein
the at least one alkaline earth metal consists of calcium; and
in an average composition of the fluoride ion conductor, a ratio of a mole number of the calcium to a total mole number of the potassium and the calcium is 0.2 or more and 0.3 or less.

5. A fluoride ion secondary battery comprising:
a positive electrode;
a negative electrode; and
an electrolyte disposed between the positive electrode and the negative electrode and having a fluoride ion conductivity, wherein
at least one of the positive electrode, the negative electrode, and the electrolyte includes the fluoride ion conductor according to claim 1 .

6. The fluoride ion secondary battery according to claim 5 , wherein
the negative electrode includes the fluoride ion conductor.

7. The fluoride ion secondary battery according to claim 6 , wherein
the negative electrode includes a negative electrode active material and a coat coating the negative electrode active material; and
the coat contains the fluoride ion conductor.

8. The fluoride ion secondary battery according to claim 5 , wherein
the positive electrode includes the fluoride ion conductor.

9. The fluoride ion secondary battery according to claim 8 , wherein
the positive electrode includes a positive electrode active material and a coat coating the positive electrode active material; and
the coat contains the fluoride ion conductor.

10. The fluoride ion secondary battery according to claim 5 , wherein
the electrolyte is a liquid electrolyte.

11. The fluoride ion secondary battery according to claim 5 , wherein
the electrolyte includes the fluoride ion conductor.

12. The fluoride ion secondary battery according to claim 5 , wherein
the positive electrode includes a positive electrode active material containing at least one selected from the group consisting of Co, Cu, Bi, Sn, Pb, Fe, Zn, Ga, and C.

13. The fluoride ion secondary battery according to claim 5 , wherein
the negative electrode contains includes a negative electrode active material containing at least one selected from the group consisting of Ti, Zr, Al, Sc, Rb, Ge, Cs, Mg, K, Na, La, Ca, Ba, and Sr.

Assignees

• Panasonic Corp

Inventors

• Komori Tomoyuki

Classifications

• H01M10/36 Primary

  Accumulators not provided for in groups H01M10/05-H01M10/34 · CPC title

• H01M4/388

  Halogens · CPC title

• C01D3/02 Primary

  Fluorides · CPC title

• H01M2300/008

  Halides · CPC title

• H01M2300/0017

  Non-aqueous electrolytes · CPC title