Silicon-oxygen compound, secondary battery using it, and related battery module, battery pack and device

Patent metadata

Field	Value
Publication number	US-11522181-B2
Application number	US-202017059423-A
Country	US
Kind code	B2
Filing date	Jul 22, 2020
Priority date	Jul 29, 2019
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

The present application provide a silicon-oxygen compound, a secondary battery using it, and related battery modules, battery packs, and devices. The silicon-oxygen compound provided by the present application has a formula of SiO x , in which x satisfies 0<x<2. The silicon-oxygen compound contains both sulfur and aluminum element, and the sulfur element is present in an amount of 20 ppm˜300 ppm. The mass ratio of sulfur element to aluminum element is from 1.5 to 13.0. A secondary battery uses the silicon-oxygen compound provided in the present application, so that the secondary battery can have both long-cycle performance and high initial coulombic efficiency.

First claim

The invention claimed is:

1. A silicon-oxygen compound having a formula of SiO x , in which 0<x<2, characterized in that, the silicon-oxygen compound contains both sulfur and aluminum element, and a content of the sulfur element is 20 ppm˜300 ppm; and a mass ratio of the sulfur element to the aluminum element is from 1.5 to 13.0;
in X-ray diffraction pattern of the silicon-oxygen compound, there is a diffraction peak at a position where the diffraction angle 2θ is 26°-30°, and the full width at half maxima of the diffraction peak is 0.8°-3.2°;
there is a diffraction peak at a position where the diffraction angle 2θ is 46°-50°, and the full width at half maxima of the diffraction peak is 1.0°-4.2°;
there is a diffraction peak at a position where the diffraction angle 2θ is 54°-58°, and the full width at half maxima of the diffraction peak is 0.8°-4.5°.

2. The silicon-oxygen compound according to claim 1 , characterized in that, the content of the sulfur element is from 30 ppm to 250 ppm.

3. The silicon-oxygen compound according to claim 1 , characterized in that, the content of the aluminum element is from 5 ppm to 150 ppm.

4. The silicon-oxygen compound according to claim 1 , characterized in that, the mass ratio of the sulfur element to the aluminum element is from 2.0 to 10.0.

5. The silicon-oxygen compound according to claim 1 , characterized in that, the silicon-oxygen compound has a powder volume resistivity under a pressure of 20 MPa of 10 Ω·cm or less.

6. The silicon-oxygen compound according to claim 1 , characterized in that, the silicon-oxygen compound has an average particle diameter Dv50 of 2 μm˜15 μm.

7. The silicon-oxygen compound according to claim 1 , characterized in that, the silicon-oxygen compound has a specific surface area from 1 m 2 /g to 7 m 2 /g.

8. The silicon-oxygen compound according to claim 1 , characterized in that, the silicon-oxygen compound has a compacted density measured under a pressure of 5 tons (equivalent to 49 KN) of 1.2 g/cm 3 ˜1.7 g/cm 3 .

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

10. A secondary battery, characterized in that, the secondary battery comprises the silicon-oxygen compound according to claim 1 .

11. A device, characterized in that, the device comprises at least one of the secondary battery of claim 10 .

12. The silicon-oxygen compound according to claim 1 , wherein the content of the aluminum element is from 10 ppm to 100 ppm.

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

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

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

16. The silicon-oxygen compound according to claim 1 , wherein the silicon-oxygen compound has a compacted density measured under a pressure of 5 tons (equivalent to 49 KN) of 1.3 g/cm 3 ˜1.6 g/cm 3 .

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Liang Chengdu
• Guan Yingjie
• Zhao Yuzhen
• Wen Yan
• Huang Qisen

Classifications

• C01P2006/12

  Surface area · CPC title

• C01P2006/11

  Powder tap density · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C01B33/113 Primary

  Silicon oxides; Hydrates thereof {(preparing monoxide by reduction of siliceous material C01B33/182)} · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title