# US 12,763,367 B2 · Electrolyte composition for an anode-free metal battery cell

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- Number: US 12,763,367 B2
- Document ID: US12763367B2
- Status: Granted
- Kind: B2
- Application number: 18/302,040
- Filed: 2023-04-18
- Published: 2023-08-10
- Granted: 2026-10-13
- Earliest claimed: 2022-05-10
- Assignees: Belenos Clean Power Holding AG
- Applicants: Belenos Clean Power Holding AG
- Inventors: Yoann Mettan
- Web page: https://patentgrep.com/patent/US12763367B2

## CPC

- H01M 10/0567: characterised by the additives
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- H01M 2004/027: {Negative electrodes}
- H01M 2300/0037: Mixture of solvents
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY

## Abstract

An electrolyte composition for an anode-free metal battery cell, wherein the metal is an alkali metal, an alkaline earth metal, or a metal of Group IIIa of the periodic table, including a first solvent, a salt of the alkali metal, the alkaline earth metal or the metal of Group IIIa of the periodic table, the salt being soluble in the first solvent, and an additive. The concentration of the salt in the electrolyte is between 2 M and 3 M, and the additive is a perfluorinated organic compound including at least one halogen atom. The halogen is chlorine, bromine or iodine. An anode-free metal battery cell can include the electrolyte composition.

## Claims

### Claim 1

An electrolyte composition for an anode-free metal battery cell, comprising:
a first solvent, selected from the group consisting of alkyl esters of carbonates, ethers, nitriles, sulfones, sulfoxides, esters and ionic liquids;
optionally, a second solvent selected from the group consisting of a hydrofluoroether, a partially fluorinated alkyl ether and a combination thereof:
a salt of an alkali metal, an alkaline earth metal or a metal of Group IIIa of the periodic table, wherein the salt is soluble in the first solvent, and
a perfluorinated organic compound of Formula I
wherein
X is Cl, Br or I,
Y is Cl, Br or I,
x is between 0 and 10, and
y is between 1 and 3,
wherein
the concentration of the salt in the electrolyte is between 2 M and 3 M,
the metal of the anode-free metal battery cell is an alkali metal, an alkaline earth metal or a metal of Group IIIa of the periodic table, and
when the second solvent is present, the % by weight of the second solvent is from 2% by weight to 30% by weight of the electrolyte composition.

### Claim 2 (depends on 1)

The electrolyte composition according to claim 1, wherein
the metal is lithium (Li) or magnesium (Mg),
the salt is a lithium salt or magnesium salt, respectively, and
the battery cell is a lithium-metal battery cell or a magnesium-metal battery cell, respectively.

### Claim 3 (depends on 1)

The electrolyte composition according to claim 1, wherein X and Y are each I.

### Claim 4 (depends on 3)

The electrolyte composition according to claim 3, wherein the perfluorinated organic compound is selected from the group consisting of 1,4-diiodoperfluorobutane, 1,6-diiodoperfluorohexane, and 1,8-diiodoperfluorooctane.

### Claim 5 (depends on 1)

The electrolyte composition according to claim 1, comprising between 0.01 and 20% by weight of the perfluorinated organic compound of Formula I, based on the total weight of the electrolyte.

### Claim 6 (depends on 1)

The electrolyte composition according to claim 1, wherein the first solvent is an ionic liquid and wherein the ionic liquid comprises a cation and an anion, wherein
the cation comprises pyrrolidinium, piperidinium, imidazolium, a cyclic saturated ammonium, or combinations thereof, and
the anion comprises bis(fluorosulfonyl)imide (FSI), bis(trifluoromethanesulfonyl)imide (TFSI), or combinations thereof.

### Claim 7 (depends on 1)

The electrolyte composition according to claim 1, comprising the second solvent.

### Claim 8 (depends on 1)

An anode-free metal battery cell, comprising the electrolyte according to claim 1, wherein the metal of the anode free metal battery is an alkali metal, an alkaline earth metal or a metal of Group Illa of the periodic table.

### Claim 9 (depends on 8)

The anode-free metal battery cell according to claim 8, wherein the battery cell is a lithium-metal battery cell or a magnesium-metal battery cell.

### Claim 10 (depends on 8)

The anode-free metal battery cell according to claim 8, wherein the battery cell is a secondary battery cell.

### Claim 11 (depends on 8)

The anode-free metal battery cell according to claim 8, wherein the anode comprises a bare current collector.