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-2019207207-A1
Application number	US-201816216173-A
Country	US
Kind code	A1
Filing date	Dec 11, 2018
Priority date	Dec 28, 2017
Publication date	Jul 4, 2019
Grant date	—

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

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

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

4 . The fluoride ion conductor according to claim 1 , wherein
the at least one alkaline earth metal includes calcium; and in an average composition of the fluoride ion conductor, a ratio of the number of moles of the at least one alkaline earth metal to the total number of moles of the potassium and the at least one alkaline earth metal is 0.2 or more and 0.3 or less.

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

6 . The fluoride ion conductor according to claim 1 , wherein
the at least one alkaline earth metal includes strontium; and in an average composition of the fluoride ion conductor, a ratio of the number of moles of the at least one alkaline earth metal to the total number of moles of the potassium and the at least one alkaline earth metal is 0.1 or more and 0.6 or less.

7 . The fluoride ion conductor according to claim 3 , wherein
the at least one alkaline earth metal is strontium; and in an average composition of the fluoride ion conductor, a ratio of the number of moles of the strontium to the total number of moles of the potassium and the strontium is 0.1 or more and 0.6 or less.

8 . The fluoride ion conductor according to claim 1 , wherein
the at least one alkaline earth metal includes barium; and in an average composition of the fluoride ion conductor, a ratio of the number of moles of the at least one alkaline earth metal to the total number of moles of the potassium and the at least one alkaline earth metal is 0.1 or more and 0.8 or less.

9 . The fluoride ion conductor according to claim 3 , wherein
the at least one alkaline earth metal is barium; and in an average composition of the fluoride ion conductor, a ratio of the number of moles of barium to the total number of moles of the potassium and the barium is 0.1 or more and 0.8 or less.

10 . 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 .

11 . The fluoride ion secondary battery according to claim 10 , wherein
the negative electrode includes the fluoride ion conductor.

12 . The fluoride ion secondary battery according to claim 11 , 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.

13 . The fluoride ion secondary battery according to claim 10 , wherein
the positive electrode includes the fluoride ion conductor.

14 . The fluoride ion secondary battery according to claim 13 , 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.

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

16 . The fluoride ion secondary battery according to claim 10 , wherein
the electrolyte includes the fluoride ion conductor.

17 . The fluoride ion secondary battery according to claim 10 , 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.

18 . The fluoride ion secondary battery according to claim 10 , 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

• C01F11/22

  Fluorides · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M2300/008

  Halides · CPC title

• H01M4/136 Primary

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M4/388

  Halogens · CPC title