Silicon carbon composites comprising ultra low z

Patent metadata

Field	Value
Publication number	US-11498838-B2
Application number	US-202117505402-A
Country	US
Kind code	B2
Filing date	Oct 19, 2021
Priority date	Aug 18, 2020
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

Silicon-carbon composite materials and related processes are disclosed that overcome the challenges for providing amorphous nano-sized silicon entrained within porous carbon. Compared to other, inferior materials and processes described in the prior art, the materials and processes disclosed herein find superior utility in various applications, including energy storage devices such as lithium ion batteries.

First claim

The invention claimed is:

1. A silicon-carbon composite comprising:
a. a carbon scaffold comprising a pore volume, wherein the pore volume comprises greater than 80% microporosity;
b. a silicon content of 30% to 60% by weight;
c. a surface area less than 30 m2/g; and
d. a φ of greater than or equal to 0.12, wherein φ=(Max peak height dQ/dV in Regime I)/(Max peak height dQ/dV in Regime III), wherein dQ/dV is measured in a half-cell coin cell, and Regime I is 0.8V-0.4V and Regime III is 0.15V-0V.

2. The silicon-carbon composite of claim 1 , wherein the pore volume comprises greater than 90% microporosity.

3. The silicon-carbon composite of claim 2 , wherein the pore volume comprises greater than 95% microporosity.

4. The silicon-carbon composite of claim 3 , comprising a surface area less than 10 m2/g.

5. The silicon-carbon composite of claim 3 , comprising a surface area less than 5 m2/g.

6. The silicon-carbon composite of claim 5 , comprising a silicon content of 40% to 60% by weight.

7. The silicon-carbon composite of claim 2 , comprising a surface area less than 10 m2/g.

8. The silicon-carbon composite of claim 2 , comprising a surface area less than 5 m2/g.

9. The silicon-carbon composite of claim 2 , comprising a silicon content of 40% to 60% by weight.

10. The silicon-carbon composite of claim 1 , comprising a surface area less than 10 m2/g.

11. The silicon-carbon composite of claim 10 , comprising a silicon content of 40% to 60% by weight.

12. The silicon-carbon composite of claim 1 , comprising a surface area less than 5 m2/g.

13. The silicon-carbon composite of claim 1 , comprising a silicon content of 40% to 60% by weight.

14. The silicon carbon composite of claim 1 , wherein the y is greater than or equal to 0.13.

15. The silicon carbon composite of claim 1 , wherein the y is greater than or equal to 0.14.

16. The silicon carbon composite of claim 1 , wherein the silicon-carbon composite comprises a Dv50 ranging from 5 nm to 20 microns.

17. The silicon carbon composite of claim 1 , wherein the silicon-carbon composite comprises a capacity of greater than 900 mA/g.

18. The silicon-carbon composite of claim 1 , further comprising lithium.

19. An electrode comprising the silicon-carbon composite of claim 1 .

20. An energy storage device comprising the silicon-carbon composite of claim 1 .

21. The energy storage device of claim 20 , wherein the energy storage device is a Li ion battery.

Assignees

• Group14 Technologies Inc

Inventors

• Dhanabalan Abirami
• Sakshaug Avery J
• Costantino Henry R

Classifications

• C04B2111/00853

  in electrochemical cells or batteries, e.g. fuel cells · CPC title

• C01P2004/60

  Particles characterised by their size · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• C01P2006/12

  Surface area · CPC title

• H01M10/052

  Li-accumulators · CPC title