# US 2021/0280858 A1 · Cathode active material and fluoride ion battery

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- Number: US 2021/0280858 A1
- Document ID: US20210280858A1
- Status: Published application
- Kind: A1
- Application number: 17/190,156
- Filed: 2021-03-02
- Published: 2021-09-09
- Earliest claimed: 2020-03-06
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Hideki IBA; Takeshi TOJIGAMORI
- Web page: https://patentgrep.com/patent/US20210280858A1

## CPC

- H01M 4/38: of elements or alloys
- H01M 10/05: Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence)
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A main object of the present disclosure is to provide a cathode active material with excellent capacity properties. In order to achieve the object, the present disclosure provides a cathode active material to be used in a fluoride ion battery wherein the cathode active material mainly contains a metal element M and a metal element M′; the metal element M is at least one kind of Cu, Fe and Mn; and the metal element M′ is at least one kind of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Yb.

## Claims

### Claim 1

A cathode active material to be used in a fluoride ion battery, wherein
the cathode active material is an alloy mainly containing a metal element M and a metal element M′;
the metal element M is at least one kind of Cu, Fe and Mn;
the metal element M′ is at least one kind of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Yb.

### Claim 2 (depends on 1)

The cathode active material according to claim 1, wherein the metal element M includes at least Cu.

### Claim 3 (depends on 2)

The cathode active material according to claim 2, wherein the metal element M′ includes at least one kind of Y, La, Pr, Nd, Sm, Tb and Dy.

### Claim 4 (depends on 2)

The cathode active material according to claim 2, wherein the metal element M′ includes at least La.

### Claim 5 (depends on 1)

The cathode active material according to claim 1, wherein the alloy has a composition represented by Cu1−xLax (0.09≤x≤0.5).

### Claim 6 (depends on 1)

The cathode active material according to claim 1, wherein the alloy has a composition represented by Cu1−xLax (0.24≤x≤0.5).

### Claim 7 (depends on 1)

The cathode active material according to claim 1, wherein the metal element M includes at least Fe.

### Claim 8 (depends on 7)

The cathode active material according to claim 7, wherein the metal element M′ includes at least one of La and Ce.

### Claim 9 (depends on 1)

The cathode active material according to claim 1, wherein the alloy has a composition represented by Fe1−xLax (0.1≤x≤0.5).

### Claim 10 (depends on 1)

Cathode active material according to claim 1, wherein the alloy has a composition represented by Fe1−xCex (0.1≤x≤0.5).

### Claim 11 (depends on 1)

The cathode active material according to claim 1, wherein the metal element M includes at least Mn.

### Claim 12 (depends on 11)

The cathode active material according to claim 11, wherein the metal element M′ includes at least La.

### Claim 13 (depends on 1)

The cathode active material according to claim 1, wherein the alloy has a composition represented by Mn1−xLax (0.1≤x≤0.5).

### Claim 14 (depends on 1)

A fluoride ion battery including a cathode active material layer, an anode active material layer, and an electrolyte layer formed between the cathode active material layer and the anode active material layer, wherein
the cathode active material layer contains the cathode active material according to claim 1.