Active material for fluoride-ion secondary battery and fluoride-ion secondary battery using same

Patent metadata

Field	Value
Publication number	US-11271204-B2
Application number	US-202016984877-A
Country	US
Kind code	B2
Filing date	Aug 4, 2020
Priority date	May 30, 2019
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

Provided is an active material for a fluoride-ion secondary battery, the active material containing a composite fluoride. The composite fluoride has a layered structure and is represented by a composition formula AmMnFx, where A is an alkali metal, M is a transition metal, 0<m≤2, 1≤n≤2, and 3≤x≤4. The alkali metal may be at least one kind selected from the group consisting of Na, K, Rb, and Cs. The transition metal may be a 3d transition metal.

First claim

The invention claimed is:

1. An active material for a fluoride-ion secondary battery, the active material containing:
a composite fluoride which has a layered structure and is represented by a composition formula A m M n F x ,
where
A is an alkali metal;
M is a transition metal;
0<m≤2;
1<n≤2; and
3≤x≤4.

2. The active material for the fluoride-ion secondary battery according to claim 1 , wherein
the alkali metal is at least one kind selected from the group consisting of Na, K, Rb, and Cs.

3. The active material for the fluoride-ion secondary battery according to claim 1 , wherein the transition metal is a 3d transition metal.

4. The active material for the fluoride-ion secondary battery according to claim 3 , wherein the transition metal is at least one kind selected from the group consisting of Mn, Co, and Fe.

5. The active material for the fluoride-ion secondary battery according to claim 1 , wherein the alkali metal is at least one kind selected from the group consisting of K, Rb, and Cs.

6. The active material for the fluoride-ion secondary battery according to claim 1 , wherein the active material has a shape of a particle.

7. The active material for the fluoride-ion secondary battery according to claim 6 , wherein particles of the active material have a mean particle size of not less than 0.5 μm and not more than 50 μm.

8. The active material for the fluoride-ion secondary battery according to claim 1 , wherein x is 4.

9. The active material for the fluoride-ion secondary battery according to claim 1 , wherein the layered structure is a structure in which a layer including the alkali metal is interposed between layers each including the transition metal.

10. A fluoride-ion secondary battery, comprising:
a positive electrode including an active material;
a negative electrode; and
an electrolyte having fluoride-ion conductivity,
wherein the active material is the active material for the fluoride-ion secondary battery according to claim 1 .

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Zhang Jin
• Asano Kazuko
• Hibino Mitsuhiro
• Nakura Kensuke

Classifications

• H01M2300/0065

  Solid electrolytes · CPC title

• H01M10/05

  Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence) · CPC title

• H01M4/136

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

• C01P2002/22

  layered hydroxide-type, e.g. of the hydrotalcite-type · CPC title

• C01G51/08

  Halides; Oxyhalides · CPC title