Sulfur-carbon material
View Patent ↗An electrode material having carbon and sulfur is provided. The carbon is in the form of a porous matrix having nanoporosity and the sulfur is sorbed into the nanoporosity of the carbon matrix. The carbon matrix can have a volume of nanoporosity between 10 and 99%. In addition, the sulfur can occupy between 5 to 99% of the nanoporosity. A portion of the carbon structure that is only partially filled with the sulfur remains vacant allowing electrolyte egress. In some instances, the nanoporosity has nanopores and nanochannels with an average diameter between 1 nanometer and 999 nanometers. The sulfur is sorbed into the nanoporosity using liquid transport or other mechanisms providing a material having intimate contact between the electronically conductive carbon structure and the electroactive sulfur.
1. A material comprising:
carbon and sulfur;
said carbon in the form of a porous matrix having nanoporosity in the form of nanopores and nanochannels having an average diameter between 1 nanometer and 50 nanometers; and
said sulfur sorbed into a portion of said nanoporosity of said carbon matrix and in the form of nanoparticles having an external dimension that is greater than a minimal diameter of said nanoporosity where said nanoparticles are located such that said nanoparticles are trapped within said carbon matrix;
said sulfur occupying more than 5% and less than 100% said nanoporosity such that there is free volume available within said nanoporosity.
2. The material of claim 1 , wherein said matrix has between 10 and 99 percent by volume of said nanoporosity.
3. The material of claim 2 , wherein said sulfur occupies more than 50% and less than 100% said nanoporosity.
4. The material of claim 2 , wherein said sulfur occupies more than 75% and less than 100% said nanoporosity.
5. The material of claim 1 , further comprising a coating, said coating selected from the group consisting of organic and inorganic components.
6. The material of claim 1 , wherein at least part of said sulfur is an elemental sulfur particle.
7. The material of claim 1 , wherein at least part of said sulfur compound is a sulfur compound particle.
8. The material of claim 1 , wherein said nanopores and said nanochannels have an average diameter between 1 nanometer and 30 nanometers.
9. The material of claim 1 , wherein said nanopores and said nanochannels have an average diameter between 1 nanometer and 20 nanometers.
10. An electrode comprising the material according to claim 1 .
11. The electrode of claim 10 , further comprising a binding compound, other additives and combinations thereof.
12. A battery having:
a negative electrode;
an electrolyte; and
a positive electrode according to claim 10 .
13. A material comprising:
carbon and sulfur;
said carbon in the form of a porous matrix in the form of nanopores and nanochannels defining a porosity, said nanopores and said nanochannels having an average diameter between 1 nanometer and 50 nanometers; and
said sulfur sorbed into a portion of said nanopores and said nanochannels of said carbon matrix in the form of nanoparticles having an external dimension that is greater than a minimal diameter of said nanoporosity where said nanoparticles are located such that said nanoparticles are trapped within said porous matrix and occupy more than 5% and less than 100% of said porosity such that there is free volume available within said porosity.
14. The material of claim 13 , wherein at least part of said sulfur is an elemental sulfur particle.
15. The material of claim 13 , wherein said at least part of said sulfur is present as a sulfur compound particle.
16. A battery having a sulfur-carbon electrode, the battery comprising:
a negative electrode containing lithium;
an electrolyte;
a positive electrode, said positive electrode having:
a porous carbon matrix having nanopores and nanochannels defining a porosity, said nanopores and said nanochannels having an average diameter between 1 nanometer and 50 nanometers; and
sulfur sorbed into a portion of said nanopores and said nanochannels of said carbon matrix in the form of nanoparticles having an external dimension that is greater than a minimal diameter of said nanoporosity where said nanoparticles are located such that said nanoparticles are trapped within said porous matrix and occupy more than 5% and less than 100% of said porosity such that there is free volume available within said porosity.