# US 12,183,918 B2 · Method and system for silicon dominant lithium-ion cells with controlled lithiation of silicon

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- Number: US 12,183,918 B2
- Document ID: US12183918B2
- Status: Granted
- Kind: B2
- Application number: 16/584,574
- Filed: 2019-09-26
- Published: 2021-04-01
- Granted: 2024-12-31
- Earliest claimed: 2017-12-07
- Assignees: Enevate Corporation
- Applicants: Enevate Corporation
- Inventors: Benjamin Park; Ian Browne; Sung Won Choi; Fred Bonhomme
- Web page: https://patentgrep.com/patent/US12183918B2

## CPC

- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/0445: {Forming after manufacture of the electrode, e.g. first charge, cycling}
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00)
- H01M 10/446: {Initial charging measures}
- H01M 2004/027: {Negative 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

Systems and methods for silicon dominant lithium-ion cells with controlled lithiation of silicon may include a cathode, an electrolyte, and an anode. The anode may include silicon lithiated at a level after discharge that is configured to be above a minimum threshold level, where the minimum threshold lithiation is 3% silicon lithiation. The lithiation level of the silicon after charging the battery may range between 30% and 95% silicon lithiation, between 30% and 75% silicon lithiation, between 30% and 65% silicon lithiation, or between 30% and 50% silicon lithiation. The lithiation level of the silicon after discharging the battery may range between 3% and 50% silicon lithiation, between 3% and 30% silicon lithiation, or between 3% and 10% silicon lithiation. The minimum threshold level may be a lithiation level below which a cycle life of the battery degrades. The electrolyte may include a liquid, solid, or gel.

## Claims

### Claim 1

A battery, the battery comprising:
a cathode, an electrolyte, and an anode, the anode comprising silicon lithiated at a level after discharge that is configured to be above a minimum threshold level that is equal to or lower than a prelithiation level of the silicon, wherein the minimum threshold lithiation is 3% silicon lithiation.

### Claim 2 (depends on 1)

The battery according to claim 1, wherein the lithiation level of the silicon after discharge is configured by a discharge voltage of the anode.

### Claim 3 (depends on 1)

The battery according to claim 1, wherein the lithiation level of the silicon after charging the battery ranges between 30% and 95% silicon lithiation.

### Claim 4 (depends on 1)

The battery according to claim 1, wherein the lithiation level of the silicon after charging the battery ranges between 30% and 75% silicon lithiation.

### Claim 5 (depends on 1)

The battery according to claim 1, wherein the lithiation level of the silicon after charging the battery ranges between 30% and 65% silicon lithiation.

### Claim 6 (depends on 1)

The battery according to claim 1, wherein the lithiation level of the silicon after charging the battery ranges between 30% and 50% silicon lithiation.

### Claim 7 (depends on 1)

The battery according to claim 1, wherein the lithiation level of the silicon after discharging the battery ranges between 3% and 50% silicon lithiation.

### Claim 8 (depends on 1)

The battery according to claim 1, wherein the lithiation level of the silicon after discharging the battery ranges between 3% and 30% silicon lithiation.

### Claim 9 (depends on 1)

The battery according to claim 1, wherein the lithiation level of the silicon after discharging the battery ranges between 3% and 10% silicon lithiation.

### Claim 10 (depends on 1)

The battery according to claim 1, wherein the minimum threshold level is a lithiation level below which a cycle life of the battery degrades.

### Claim 11 (depends on 1)

The battery according to claim 1, wherein the electrolyte comprises a liquid, solid, or gel.

### Claim 12

An anode for use in a cell of a battery, the anode comprising silicon that is lithiated above a minimum threshold level upon discharge of the cell when incorporated in a lithium ion battery, wherein a silicon lithiation level after discharge of the cell is set by a voltage of the anode at a discharge mode of the cell or a prelithiation level of the silicon.