Ultrasound assisted in-situ formation of carbon/sulfur cathodes
A process of preparing an E-carbon nanocomposite includes contacting a porous carbon substrate with an E-containing material to form a mixture; and sonicating the mixture to form the E-carbon nanocomposite; where E is S, Se, Se x S y , or Te, x is greater than 0; and y is greater than 0.
1. A process of preparing an E-carbon nanocomposite, the process comprising:
contacting a porous carbon substrate with an E-containing material to form a mixture; and
sonicating the mixture to form the E-carbon nanocomposite;
wherein:
E is S, Se, or Te;
and wherein the step of sonicating produces elemental E.
2. The process of claim 1 , wherein the E-containing material is a salt.
3. The process of claim 2 , wherein the salt and the porous carbon substrate are contacted in an aqueous medium.
4. The process of claim 3 , wherein the aqueous medium further comprises an acid.
5. The process of claim 1 , wherein E-containing material comprises Na 2 S 2 O 3 , Li 2 S 2 O 3 , K 2 S 2 O 3 , (NH 4 ) 2 S 2 O 3 , or a hydrated form of Na 2 S 2 O 3 , Li 2 S 2 O 3 , K 2 S 2 O 3 , or (NH 4 ) 2 S 2 O 3 .
6. The process of claim 1 , wherein the S, Se, or Te in the E-carbon nanocomposite is present from about 30 wt % to about 60 wt %.
7. The process of claim 1 , wherein the porous carbon substrate comprises microporous carbon, mesoporous carbon, mesoporous microbeads, graphite, expandable graphite, graphene, carbon black, or carbon nanotubes.
8. A process of preparing a Li 2 S-carbon nanocomposite, the process comprising:
contacting a porous carbon substrate with a material containing lithium and sulfur in a solid state to form a mixture;
heating the mixture to form a heated mixture at a temperature; and
sonicating the heated mixture to form the Li 2 S-carbon nanocomposite.
9. The process of claim 8 , wherein the contacting and sonicating are performed under an inert atmosphere, or in a reducing atmosphere comprising an inert gas and hydrogen.
10. The process of claim 8 , wherein the temperature is from about 600° C. to about 1000° C.
11. The process of claim 8 , wherein the Li 2 S-carbon nanocomposite has from 20 wt % to 80 wt % sulfur.
12. The process of claim 8 , wherein the porous carbon substrate comprises microporous carbon, mesoporous carbon, mesoporous microbeads, graphite, expandable graphite, graphene, carbon black, or carbon nanotubes.