Systems and methods for potassium enhancing silicon-containing anodes for improved cyclability

1. A method for enhancing a silicon-containing anode for a battery cell, the method comprising:

providing a silicon-containing anode having reversible electrochemical capabilities comprising a silicon-containing material and an anode material compatible with a lithium-ion battery chemistry having porous and conductive mechanical properties;

forming a compression layer in the silicon-containing anode, wherein the compression layer is formed by potassium ions placing the silicon atoms of the silicon-containing material in a pre-compressive state to counteract internal stress exerted on the silicon-containing material.

2. The method for enhancing the silicon-containing anode for a battery cell of claim 1 , wherein forming the compression layer in the silicon-containing anode comprises enriching a surface layer of the silicon-containing anode.

3. The method for enhancing the silicon-containing anode for a battery cell of claim 2 , wherein enriching the surface layer of the silicon-containing anode comprises immersing the silicon-containing material in a sodium-containing solution to form a sodium-ion enriched surface layer.

4. The method for enhancing the silicon-containing anode for a battery cell of claim 3 , wherein enriching the surface layer of the silicon-containing anode further comprises maintaining the silicon-containing material in the sodium-containing solution at a temperature within a range from 300° C. to 600° C.

5. The method for enhancing the silicon-containing anode for a battery cell of claim 4 , wherein the temperature of the silicon-containing material in the sodium-containing solution is maintained for a time duration within a range from 5 minutes to 24 hours.

6. The method for enhancing the silicon-containing anode for a battery cell of claim 3 , wherein forming the compression layer in the silicon-containing anode further comprises immersing the sodium-ion enriched surface layer of the silicon-containing material in a potassium-containing solution.

7. The method for enhancing the silicon-containing anode for a battery cell of claim 6 , wherein the potassium-containing solution comprises a potassium nitrate solution.

8. The method for enhancing the silicon-containing anode for a battery cell of claim 2 , wherein the surface layer has a thickness within a range from 1 nm to 750 nm.

9. The method for enhancing the silicon-containing anode for a battery cell of claim 1 , wherein the silicon-containing anode comprises 3 to 30 percent by weight silicon.

10. The method for enhancing the silicon-containing anode for a battery cell of 1 , wherein the silicon-containing material comprises at least one of a silicene, a silicon oxide, or a silicon carbide.

11. A method for enhancing a silicon-containing anode for a battery cell, the method comprising:

providing a silicon-containing anode having reversible electrochemical capabilities comprising a silicon-containing material and an anode material compatible with a lithium-ion battery chemistry having porous and conductive mechanical properties;

enriching a surface layer of the silicon-containing anode with a plurality of first ions to intersperse the plurality of first ions between silicon atoms of the silicon-containing material; and

displacing the plurality of first ions with a plurality of second ions to form a compression layer in the silicon-containing anode, wherein the plurality of second ions:

have a size that is larger than the size of the plurality of first ions; and

places the silicon atoms of the silicon-containing material in a pre-compressive state to counteract internal stress exerted on the silicon-containing material.

12. The method for enhancing the silicon-containing anode for a battery cell of 11 , wherein the plurality of first ions comprises sodium ions.

13. The method for enhancing the silicon-containing anode for a battery cell of 11 , wherein the plurality of second ions comprises potassium ions.

14. The method for enhancing the silicon-containing anode for a battery cell of 11 , wherein enriching the surface layer of the silicon-containing anode with the plurality of first ions comprises immersing the silicon-containing material in a sodium-containing solution to form an enriched surface layer.

15. The method for enhancing the silicon-containing anode for a battery cell of 11 , wherein displacing the plurality of first ions with the plurality of second ions to form the compression layer in the silicon-containing anode comprises immersing the surface layer of silicon-containing anode enriched with the plurality of first ions in a potassium-containing solution.

16. An enhanced silicon-containing anode for a battery cell, the anode comprising:

an anode material having reversible electrochemical capabilities;

a silicon-containing material comprising silicon particles; and

a compression layer comprising a plurality of ions interspersed between the silicon particles in a surface layer of the silicon-containing material, wherein:

the plurality of ions in the compression layer have a size that exerts compressive forces on the silicon particles and places the silicon-containing material in a pre-compressive state; and

the surface layer has a thickness within a range from 1 nm to 750 nm.

17. The enhanced silicon-containing anode of claim 16 , wherein the enhanced silicon-containing anode is part of a battery cell.

18. The enhanced silicon-containing anode of claim 16 , wherein the silicon-containing material comprises a silicon oxide.

19. The enhanced silicon-containing anode of claim 16 , wherein the silicon-containing material comprises at least one of silicene, SiC, SiO, SiO 2 , SiO 3 , or SiO 4 .

20. The enhanced silicon-containing anode of claim 16 , wherein the anode material comprises lithium.