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Fluoride ion conductor containing rubidium, magnesium, and fluorine, and fluoride ion secondary battery including the same

專利號
US10868328B2
公開日期
2020-12-15
申請人
Panasonic Corporation（JP Osaka）
發(fā)明人
Tomoyuki Komori
IPC分類
H01M10/00; H01M10/054; H01M4/58; H01M10/0563; H01M10/0562; H01M10/05; C01F5/28; H01B1/00; H01M4/04; H01B1/12
技術(shù)領(lǐng)域
fluoride,electrode,ion,layer,rbf,battery,conductive,material,mgf2,negative
地域： Osaka

摘要

A fluoride ion conductor contains rubidium, magnesium, and fluorine. In an average composition of the fluoride ion conductor, the ratio of the number of moles of the magnesium to the total number of moles of the rubidium and the magnesium is less than 0.4.

說明書

BACKGROUND 1. Technical Field

The present disclosure relates to a fluoride ion conductor and a fluoride ion secondary battery.

2. Description of the Related Art

As one type of secondary batteries, shuttlecock batteries are known. In the shuttlecock batteries, ions migrate between a positive electrode and a negative electrode via an electrolyte to perform charge and discharge. Lithium ion secondary batteries using lithium ions as the migrating ions have been widely spread as shuttlecock batteries. In recent years, fluoride ion secondary batteries using fluoride ions instead of lithium ions have been reported.

Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2008-537312 discloses a solid electrolyte that can be used in fluoride solid-state secondary batteries. This solid electrolyte is a complex fluoride containing a fluoride of La or Ce as a base and one or more fluorides of alkaline earth metals (e.g., CaF2, SrF2, or BaF2) and/or an alkali metal fluoride (e.g., LiF, KF, or NaF) and/or an alkali metal chloride (e.g., LiCl, KCl, or NaCl).

Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2013-510409 discloses an electron insulation amorphous ion conductor composition further including a glass network modifier. This glass network modifier is LaF3, BiF3, PbF2, KF, CaF2, BaF2, SnF2, SrF2, or a rare earth metal fluoride.

SUMMARY

權(quán)利要求

1
What is claimed is:1. A fluoride ion secondary battery comprising:a positive electrode;a negative electrode; andan electrolyte disposed between the positive electrode and the negative electrode and having a fluoride ion conductivity,wherein the negative electrode includes a negative electrode active material and a coat coating the negative electrode active material, and the coat contains a fluoride ion conductor,wherein the fluoride ion conductor comprises:rubidium;magnesium; andfluorine, andwherein in an average composition of the fluoride ion conductor, a ratio of the number of moles of the magnesium to the total number of moles of the rubidium and the magnesium is less than 0.4.2. The fluoride ion secondary battery according to claim 1, wherein the fluoride ion conductor comprises:a compound containing rubidium, magnesium, and fluorine.3. The fluoride ion secondary battery according to claim 2, wherein the fluoride ion conductor further comprises:a mixture containing rubidium, magnesium, and fluorine.4. The fluoride ion secondary battery according to claim 1, wherein for the fluoride ion conductor,the ratio of the number of moles of the magnesium to the total number of moles of the rubidium and the magnesium is 0.1 or more and 0.3 or less.5. The fluoride ion secondary battery according to claim 1, wherein the fluoride ion conductor consists of:rubidium, magnesium, and fluorine.6. The fluoride ion secondary battery according to claim 1, whereinthe positive electrode includes the fluoride ion conductor.7. The fluoride ion secondary battery according to claim 6, whereinthe positive electrode includes a positive electrode active material and a coat coating the positive electrode active material; andthe coat coating the positive electrode active material contains the fluoride ion conductor.8. The fluoride ion secondary battery according to claim 1, whereinthe electrolyte is a liquid electrolyte.9. The fluoride ion secondary battery according to claim 1, whereinthe electrolyte includes the fluoride ion conductor.10. The fluoride ion secondary battery according to claim 1, whereinthe 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.11. The fluoride ion secondary battery according to claim 1, whereinthe negative electrode active material contains at least one selected from the group consisting of Ti, Zr, Al, Sc, Rb, Ge, Cs, Mg, K, Na, La, Ca, Ba, and Sr.12. A fluoride ion secondary battery comprising:a positive electrode including a positive electrode active material and a first coat coating the positive electrode active material;a negative electrode including a negative electrode active material and a second coat coating the negative electrode active material; andan electrolyte disposed between the positive electrode and the negative electrode and having a fluoride ion conductivity,wherein at least one of the first coat and the second coat contains a fluoride ion conductor,wherein the fluoride ion conductor comprises:rubidium;magnesium; andfluorine, andwherein in an average composition of the fluoride ion conductor, a ratio of the number of moles of the magnesium to the total number of moles of the rubidium and the magnesium is less than 0.4.
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