# US 12,119,451 B2 · Capacity compensating electrolyte with sulfite solvent for lithium ion batteries with silicon-based anodes

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- Number: US 12,119,451 B2
- Document ID: US12119451B2
- Status: Granted
- Kind: B2
- Application number: 17/318,067
- Filed: 2021-05-12
- Published: 2021-12-02
- Granted: 2024-10-15
- Earliest claimed: 2020-05-26
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Kai Yan; Wei Zhou; Peng Lu; Tsuyonobu Hatazawa
- Web page: https://patentgrep.com/patent/US12119451B2

## CPC

- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 10/0568: characterised by the solutes
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0569: characterised by the solvents
- H01M 2300/0028: characterised by the solvent
- H01M 2300/0045: Room temperature molten salts comprising at least one organic ion
- 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

An electrochemical cell for a lithium ion battery has an anode comprising a silicon-based active material, a cathode comprising a cathode active material, and a capacity compensating electrolyte comprising a linear sulfite-based solvent and a lithium imide salt. A molar ratio of the lithium imide salt to the linear sulfite-based solvent is between 1:5 and 1:1.

## Claims

### Claim 1

An electrochemical cell, comprising:
an anode comprising a silicon-based active material;
a cathode comprising a cathode active material; and
an electrolyte comprising only a linear sulfite-based solvent and a lithium imide salt.

### Claim 2 (depends on 1)

The electrochemical cell of claim 1, wherein a molar ratio of the lithium imide salt to the linear sulfite-based solvent is between 1:5 and 1:1.

### Claim 3 (depends on 1)

The electrochemical cell of claim 1, wherein the lithium imide salt is LiFSI.

### Claim 4 (depends on 1)

The electrochemical cell of claim 1, wherein the lithium imide salt is LiTFSI.

### Claim 5 (depends on 1)

The electrochemical cell of claim 1, wherein the lithium imide salt is LiFTFSI.

### Claim 6 (depends on 1)

The electrochemical cell of claim 1, wherein the lithium imide salt is LiBETI.

### Claim 7 (depends on 1)

The electrochemical cell of claim 1, wherein the linear sulfite-based solvent is dimethyl sulfite.

### Claim 8 (depends on 1)

The electrochemical cell of claim 1, wherein the linear sulfite-based solvent is diethyl sulfite.

### Claim 9

An electrochemical cell, comprising:
an anode comprising a silicon-based active material;
a cathode comprising a cathode active material; and
an electrolyte comprising only dimethyl sulfite as a solvent, at least one lithium imide salt, and optionally independently, an additive and a diluent.

### Claim 10 (depends on 9)

The electrochemical cell of claim 9, wherein the at least one lithium imide salt is selected from the group consisting of LiFSI, LiTFSI, LiBETI and LiFTFSI.

### Claim 11 (depends on 9)

The electrochemical cell of claim 9, wherein a molar ratio of the at least one lithium imide salt to the at least one linear sulfite-based solvent is between 1:5 and 1:1.

### Claim 12 (depends on 9)

The electrochemical cell of claim 9, wherein the additive is less than 10 wt % of the electrolyte.

### Claim 13

An electrochemical cell, comprising:
an anode comprising a silicon-based active material;
a cathode comprising a cathode active material; and
an electrolyte comprising only a linear sulfite-based solvent and a lithium imide salt, wherein a molar ratio of the lithium imide salt to the linear sulfite-based solvent is between 1:5 and 1:1.

### Claim 14 (depends on 13)

The electrochemical cell of claim 13, wherein the lithium imide salt is LiFSI, LiTFSI, LIFTFSI, LiBETI or a combination thereof.

### Claim 15 (depends on 13)

The electrochemical cell of claim 13, wherein the linear sulfite-based solvent is dimethyl sulfite, diethyl sulfite, or a combination thereof.