# US 10,333,141 B2 · Silicon-silicon oxide-lithium composite material having nano silicon particles embedded in a silicon:silicon lithium silicate composite matrix, and a process for manufacture thereof

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,333,141 B2
- Document ID: US10333141B2
- Status: Granted
- Kind: B2
- Application number: 15/637,291
- Filed: 2017-06-29
- Published: 2017-10-19
- Granted: 2019-06-25
- Earliest claimed: 2015-03-02
- Assignees: Eocell Ltd
- Applicants: Eocell Ltd.
- Inventors: Yuriy Matus; Michael Pak
- Web page: https://patentgrep.com/patent/US10333141B2

## CPC

- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/0402: {Methods of deposition of the material}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/1395: of electrodes based on metals, Si or alloys
- H01M 4/364: {as mixtures}
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/625: {Carbon or graphite}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/027: {Negative electrodes}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- 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 process for producing a silicon:silicon oxide:lithium composite (SSLC) material useful as a negative electrode active material for non-aqueous battery cells includes: producing a partially lithiated SSLC material by way of mechanical mixing; subsequently producing a further prelithiated SSLC material by way of spontaneous lithiation procedure; and subsequently producing a delithiated SSLC material by way of reacting lithium silicide within the dispersed prelithiated SSLC material with organic solvent(s) to extract lithium from the prelithiated SSLC material, until reactivity of lithium silicide within the prelithiated SSLC material with the organic solvent(s) ceases. The delithiated SSLC material is a porous plastically deformable matrix having nano silicon embedded therein. The delithiated SSLC material can have a lithium silicide content of less than 0.5% by weight. A battery cell having as its negative electrode active material an SSLC material as set forth herein can exhibit an irreversible capacity loss of less than 10%.

## Claims

### Claim 1

A completely delithiated silicon:silicon oxide:lithium composite (SSLC) material for use as a lithium ion battery secondary cell negative electrode, the SSLC material having a silicon content of 30%-60% by weight, a lithium content of 10%-20% by weight, an oxygen content of 25%-40% by weight, and a lithium silicide content of less than 0.5% by weight uniformly distributed therein.

### Claim 2 (depends on 1)

The SSLC material of claim 1, wherein the lithium ion battery secondary cell exhibits an irreversible capacity loss of less than 15%.

### Claim 3 (depends on 2)

The SSLC material of claim 2, wherein the lithium ion secondary battery cell exhibits an irreversible capacity loss of less than 12%.

### Claim 4 (depends on 2)

The lithium ion battery secondary cell of claim 2, wherein an anode thereof exhibits a volume change of 10-35% in association with the lithium ion battery secondary cell charging and discharging.

### Claim 5 (depends on 4)

The lithium ion battery secondary cell of claim 4, wherein the anode exhibits an average volume change of 20% in association with the lithium ion battery secondary cell charging and discharging.

### Claim 6 (depends on 1)

The SSLC material of claim 1, wherein the delithiated SSLC material has a particle size of 1-10 μm.

### Claim 7 (depends on 1)

The SSLC material of claim 1, wherein the silicon content comprises nano silicon particles having a particle size of 5-150 nm.