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 battery anode electrode material comprising:
a plurality of composite particles comprising:
a plurality of porous carbon particles comprising a milled activated carbon particle; and
an electrochemical modifier incorporated into pores of the porous carbon particles,
wherein:
the porous carbon particles have a mean particle diameter of less than 1 mm;
the porous carbon particles have a specific surface area of at least 400 m 2 /g; and
the porous carbon particles have less than 500 ppm of all atoms having a molecular weight between 1 and 92, measured by photon induced x ray emissions.
2. The material of claim 1 , wherein 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.
3. The material of claim 1 , wherein each particle in the plurality of composite particles further comprises micropores and mesopores.
4. The material of claim 1 , wherein the electrochemical modifier is silicon.
5. The material of claim 1 , further comprising a carbon layer on the surface of the composite particles.
6. The material of claim 5 , wherein the carbon layer is between 1 nm and 50 nm thick.
7. The material of claim 5 , wherein the carbon layer is less than 5 nm in thickness.
8. The material of claim 1 , wherein the electrochemical modifier comprises between 0.5% and 99.5% by weight of the composite particles.
9. The material of claim 1 , wherein the porous carbon particles are spherical.
10. A rechargeable lithium battery comprising:
(a) a positive electrode comprising a positive active material;
(b) a negative electrode comprising the electrode material of claim 1 ;
(c) an electrolyte solution; and
(d) a porous separator disposed between the positive electrode and the negative electrode.
11. A battery anode electrode material comprising:
a plurality of composite particles comprising:
a plurality of porous carbon particles comprising a milled activated carbon particle; and
an electrochemical modifier comprising elemental silicon incorporated into pores of the porous carbon particles,
wherein:
the porous carbon particles have a mean particle diameter of less than 1 mm;
the porous carbon particles have a specific surface area of at least 400 m 2 /g; and
the porous carbon particles have less than 500 ppm of all atoms having a molecular weight between 1 and 92, measured by photon induced x ray emissions.
12. The material of claim 11 , wherein 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.
13. The material of claim 11 , wherein the porous carbon further comprises a total pore volume of at least 0.5 cc/g.
14. The material of claim 11 , wherein the porous carbon particles are electrically conductive.
15. The material of claim 11 , wherein the silicon carbon composite particle comprises a silicon content of 0.5% and 99.5% weight percent.
16. The material of claim 11 , wherein the silicon carbon composite particle comprises a silicon content of at least 25% to 95% weight percent.
17. The material of claim 11 , wherein the activated carbon further comprises at least 0.1 cc/g of pores with a pore size greater than 20 Angstroms.
18. The material of claim 11 , 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.
19. The material of claim 11 , wherein the activated carbon comprises at least 0.2 cc/g of pores with a pore size less than 20 Angstroms.
20. The material of claim 11 , wherein the activated carbon comprises a peak pore volume range from 2 to 100 nm.
21. The material of claim 11 , wherein the porous carbon particles are spherical.
22. A rechargeable lithium battery comprising:
a positive electrode comprising a positive active material;
a negative electrode comprising the electrode material of claim 11 ;
an electrolyte solution; and
a porous separator disposed between the positive electrode and the negative electrode.