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 high purity electrode material comprising a plurality silicon-carbon composite particles, wherein the silicon-carbon composite particles comprise:
(i) a carbon particle having micropores;
(ii) a first electrochemical modifier comprising silicon, wherein the silicon is disposed within the pores of the carbon particle; and
(iii) a second electrochemical modifier comprising carbon, wherein the carbon is disposed on the surface of the carbon particle,
and wherein:
the carbon particle has mean particle diameter of less than 1 mm;
the carbon particle has a specific surface area of at least 400 m 2 /g; and
the carbon particle has less than 500 ppm of all atoms having a molecular weight between 11 and 92, as measured by photon induced x-ray emissions.
2. The electrode material of claim 1 , wherein the carbon particle is substantially spherical.
3. The electrode material of claim 1 , wherein the individual ones of the silicon-carbon composite particles are substantially spherical.
4. The electrode material of claim 1 , wherein the carbon particle further comprises a pore in fluid communication with an exterior surface of the carbon particle and wherein the electrochemical modifier is in electrical contact with a surface of the pore.
5. The electrode material of claim 1 , wherein the carbon particle is electrically conductive.
6. The electrode material of claim 1 , wherein the electrochemical modifier comprises at least 25% to 95% weight percent of the electrode material.
7. The electrode material of claim 1 wherein the carbon particle further comprises at least 0.1 cc/g of pores with a pore size greater than 20 Angstroms.
8. The electrode material of claim 1 , wherein the silicon-carbon composite particles further comprising a span of 3 or less, wherein the span is defined as (Dv,90−Dv,10)/Dv,50 and wherein Dv,10, Dv,50, and Dv,90 refer to the pore size at 10%, 50%, and 90% of the distribution by volume.
9. The electrode material of claim 1 , wherein the carbon particle has a pore size distribution from 0.35 nm to 50 nm.
10. The electrode material of claim 1 , wherein individual ones of the silicon-composite particles further comprise a surface and a coating on the surface.
11. The electrode material of claim 1 , wherein the plurality silicon-carbon composite particles comprise a specific area of at least 1,500 m 2 /g.
12. The electrode material of claim 1 , wherein the carbon particle further comprises a peak pore volume range from 2 to 100 nm.
13. 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.
14. A high purity electrode material comprising a plurality of carbon composite particles including at least one carbon composite particle having micropores and mesopores, and wherein:
(a) the carbon composite particle comprises a carbon particle and a first electrochemical modifier disposed within pores of the carbon particle;
(b) the carbon particle has a specific surface area of at least 400 m2/g; and
(c) the carbon particle has less than 500 ppm of all atoms having a molecular weight between 11 and 92 as measured by photon induced x-ray emissions,
and wherein the carbon composite particle comprises a second electrochemical modifier comprising carbon, wherein the carbon is disposed on the surface of the carbon particle.
15. The electrode material of claim 14 , comprising a specific area of at least 1,500 m 2 /g.
16. The electrode material of claim 14 , wherein the first electrochemical modifier comprises nitrogen or silicon.
17. The electrode material of claim 14 , wherein the plurality of the carbon composite particles further comprise a volume average particle size, Dv,50, of less than 1 mm and a span of 3 or less, wherein the span is defined as (Dv,90−Dv,10)/Dv,50 and wherein Dv,10, Dv,50, and Dv,90 refer to the pore size at 10%, 50%, and 90% of the distribution by volume.
18. The electrode material of claim 14 , wherein the carbon composite particle comprises greater than 100 ppm of the first electrochemical modifier.
19. The electrode material of claim 14 , wherein the electrode material comprises at least 25% to 95% weight percent of the first electrochemical modifier.
20. The electrode material of claim 14 , wherein the carbon composite particle has a peak pore volume range from 2 to 100 nm.
21. The electrode material of claim 14 , wherein the carbon composite particle is substantially spherical.
22. A rechargeable lithium battery comprising:
(a) a positive electrode comprising a positive active material;
(b) a negative electrode comprising the electrode material of claim 14 ;
(c) an electrolyte solution; and
(d) a porous separator disposed between the positive electrode and the negative electrode.