# US 12,224,434 B2 · Silicon-oxygen compound, preparation method thereof, and related battery module, battery pack and device

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- Number: US 12,224,434 B2
- Document ID: US12224434B2
- Status: Granted
- Kind: B2
- Application number: 17/140,088
- Filed: 2021-01-03
- Published: 2021-06-10
- Granted: 2025-02-11
- Earliest claimed: 2019-07-29
- Assignees: Contemporary Amperex Technology (Hong Kong) Limited
- Applicants: Contemporary Amperex Technology (Hong Kong) Limited
- Inventors: Chengdu Liang; Yingjie Guan; Yuzhen Zhao; Yan Wen; Qisen Huang
- Web page: https://patentgrep.com/patent/US12224434B2

## CPC

- H01M 4/48: of inorganic oxides or hydroxides
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- C01B 33/113: Silicon oxides; Hydrates thereof {(preparing monoxide by reduction of siliceous material C01B33/182)}
- H01M 4/0428: {Chemical vapour deposition}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/139: Processes of manufacture
- H01M 4/364: {as mixtures}
- H01M 4/38: of elements or alloys
- H01M 4/622: {being polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 4/626: {Metals}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C01P 2002/52: containing elements as dopants
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2006/11: Powder tap density
- C01P 2006/12: Surface area
- C01P 2006/40: Electric properties
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present application provide a silicon-oxygen compound, a preparation method thereof and related secondary battery, battery module, battery pack, and device. The silicon-oxygen compound provided by the present application has a formula of SiOx, in which x satisfies 0<x<2. The silicon-oxygen compound contains both sulfur and manganese element, and the sulfur element is present in an amount of 20 ppm˜300 ppm. The mass ratio of sulfur element to manganese element is from 1.5 to 10.

## Claims

### Claim 1

A silicon-oxygen composite having a chemical formula of SiOx, in which 0<x<2;
sulfur element having a content of 20 ppm-600 ppm; and
manganese element having a content from 5 ppm to 300 ppm,
wherein a mass ratio of the sulfur element to the manganese element is from 1.5 to 10.0,
wherein an X-ray diffraction pattern of the silicon-oxygen composite has:
a first diffraction peak at a position where the diffraction angle 2θ is 26°-30°, wherein the full width at half maxima of the first diffraction peak is 0.8°-3.2°;
a second diffraction peak at a position where the diffraction angle 2θ is 46°-50°, wherein the full width at half maxima of the second diffraction peak is 1.0°-4.2°; and
a third diffraction peak at a position where the diffraction angle 2θ is 54°-58°, wherein the full width at half maxima of the third diffraction peak is 0.8°-4.5° wherein a content of the manganese element is from 5 ppm to 300 ppm.

### Claim 2 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein the content of the sulfur element is from 50 ppm to 200 ppm.

### Claim 3 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein the mass ratio of the sulfur element to the manganese element is from 2.0 to 7.0.

### Claim 4 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein the silicon-oxygen composite has a powder volume resistivity under a pressure of 20 MPa of 10 Ω·cm or less.

### Claim 5 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein the silicon-oxygen composite has an average particle diameter Dv50 of 2 μm-15 μm.

### Claim 6 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein the silicon-oxygen composite has a specific surface area from 1 m2/g to 7 m2/g.

### Claim 7 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein the silicon-oxygen composite has a compacted density measured under a pressure of 5 tons (equivalent to 49KN) of 1.2 g/cm3-1.7 g/cm3.

### Claim 8 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein a coating layer is coated on an outer surface of the silicon-oxygen composite, and the coating layer comprises one or more of a polymer, a carbon material, a metal material, and a metal compound.

### Claim 9 (depends on 1)

A secondary battery, including the silicon-oxygen composite to claim 1.

### Claim 10 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein a content of the manganese element is from 10 ppm to 90 ppm.

### Claim 11 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein the silicon-oxygen composite has a powder volume resistivity under a pressure of 20 MPa of 1 Ω·cm or less.

### Claim 12 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein the silicon-oxygen composite has an average particle diameter Dv50 of 3 μm-12 μm.

### Claim 13 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein the silicon-oxygen composite has a specific surface area from 2 m2/g to 6 m2/g.

### Claim 14 (depends on 1)

The silicon-oxygen composite according to claim 1, wherein the silicon-oxygen composite has a compacted density measured under a pressure of 5 tons (equivalent to 49KN) of 1.3 g/cm3-1.6 g/cm3.

### Claim 15 (depends on 1)

A method for preparing the silicon-oxygen composite according to claim 1, characterized in that, the method including includes the following steps:
providing raw materials comprising silicon dioxide powder, sulfur source, one or more of silicon oxide powder and metal silicon powder, and optionally manganese source; heating the raw material in an inert atmosphere under normal pressure or reduced pressure to generate gas; and
cooling the gas in an inert atmosphere under normal pressure or reduced pressure to deposit the gas to obtain the silicon-oxygen composite.

### Claim 16 (depends on 15)

The method according to claim 15, wherein the temperature of the deposition is from 800° C. to 1000° C.

### Claim 17 (depends on 15)

The method according to claim 15, further comprising: a step of crushing the obtained deposit after gas deposition; and a step of surface coating particulate matter after the obtained deposit is crushed.