Preparation of polymeric resins and carbon materials
The present application is directed to methods for preparation of carbon materials. The carbon materials comprise enhanced electrochemical properties and find utility in any number of electrical devices, for example, as electrode material in ultracapacitors or batteries.
1. A method of fabricating a battery anode electrode composition comprising a plurality of composite particles, the method comprising:
pyrolyzing a polymer to form a carbon particle;
activating the carbon particle to form an activated carbon particle;
performing a particle size reduction of the activated carbon particle to form porous carbon particles;
introducing an electrochemical modifier into pores of the porous carbon particles through vapor phase to form the plurality of composite particles; and
decomposing, from a gas phase carbon, a carbon layer on the surface of the composite particle.
2. The method of claim 1 , wherein the pyrolyzing of the polymer comprises heating polymer gel particles in an inert atmosphere at temperatures ranging from 500° C. to 2400° C.
3. The method of claim 1 , wherein the activating of the carbon particle comprises introducing the carbon particle to an atmosphere comprising carbon dioxide, carbon monoxide, steam, oxygen, or combinations thereof at a temperature ranging from 800° C. to 1300° C.
4. The method of claim 1 , wherein the particle size reduction comprises milling, grinding, jet milling, Fritsch milling, or a combination thereof, of the activated carbon.
5. The method of claim 1 , wherein:
each particle in the plurality of composite particles comprises micropores and mesopores, and
the plurality of composite particles have a Dv50 of less than 1 mm and a span of 3 or less, wherein the span is defined as (Dv,90−Dv,10)/Dv,50 where Dv,10, Dv,50, and Dv,90 refer to pore sizes at 10%, 50%, and 90% respectively within a pore size distribution by volume of the plurality of composite particles.
6. The method of claim 5 , wherein the electrochemical modifier is introduced into the pores of the porous carbon particles through the vapor phase by contacting the carbon particles with a gas comprising a second precursor for a time sufficient to achieve conversion of the second precursor to the electrochemical modifier, and wherein the second precursor comprises the electrochemical modifier.
7. The method of claim 6 , wherein the electrochemical modifier is silicon.
8. The method of claim 1 , wherein the electrochemical modifier is silicon.
9. The method of claim 1 , wherein the polymer is formed from a polymer precursor.
10. The method of claim 9 , wherein the polymer precursor comprises a saccharide, a protein, a biopolymer, or a combination thereof.
11. The method of claim 9 , wherein the polymer precursor comprises a lignin.
12. The method of claim 1 , wherein the gas phase carbon is a hydrocarbon.
13. The method of claim 1 , wherein the carbon layer is between 1 nm and 50 nm thick.
14. The method of claim 1 , wherein the carbon layer is less than 5 nm in thickness.
15. The method of claim 1 , wherein the electrochemical modifier comprises between 0.5% and 99.5% by weight of the composite particles.
16. The method of claim 1 , wherein the porous carbon particles are spherical.
17. A method of fabricating a battery anode electrode composition comprising silicon-carbon composite particles, the method comprising:
polymerizing one or more polymer precursors and one or more crosslinking compound to form a polymer particle having pores;
pyrolyzing the polymer particle to form a carbon particle having pores;
activating the carbon particle to form an activated carbon particle;
performing a particle size reduction of the activated carbon particle to form porous carbon particles; and
introducing an electrochemical modifier comprising elemental silicon into pores of the porous carbon particles to form the silicon-carbon composite particles.
18. The method of claim 17 , wherein the battery anode electrode composition comprises a plurality of the silicon-carbon composite particles having a Dv50 of less than 1 mm and a span of 3 or less, wherein the span is defined as (Dv90−Dv10)/Dv50 where Dv10, Dv50, and Dv90 refer to particle sizes at 10%, 50%, and 90% respectively within a particle size distribution by volume of the plurality of the silicon-carbon composite.
19. The method of claim 17 , wherein the porous carbon particles further comprise a total pore volume of at least 0.5 cc/g.
20. The method of claim 17 , wherein the porous carbon particles are electrically conductive.
21. The method of claim 17 , wherein the silicon-carbon composite particles comprise a silicon content of 0.5% and 99.5% weight percent.
22. The method of claim 17 , wherein the silicon-carbon composite particles comprise a silicon content of at least 25% to 95% weight percent.
23. The method of claim 17 , wherein the activated carbon further comprises at least 0.1 cc/g of pores with a pore size greater than 20 Angstroms.
24. The method of claim 17 , wherein the activated carbon further comprises a total of less than 500 ppm of all other elements, excluding the electrochemical modifier, having atomic numbers ranging from 1 to 92 as measured by proton induced x-ray emission.
25. The method of claim 17 , wherein the activated carbon comprises at least 0.2 cc/g of pores with a pore size less than 20 Angstroms.
26. The method of claim 17 , wherein the activated carbon comprises a peak pore volume range from 2 to 100 nm.
27. The method of claim 17 , wherein the porous carbon particles are spherical.
28. The method of claim 17 , wherein the one or more polymer precursors comprise a lignin.
29. The method of claim 17 , wherein the one or more polymer precursors comprise a saccharide, a protein, a biopolymer, or a combination thereof.
30. The method of claim 9 , wherein the polymer is further defined from one or more crosslinking compound.