Electrode materials for rechargeable batteries
Selenium or selenium-containing compounds may be used as electroactive materials in electrodes or electrochemical devices. The selenium or selenium-containing compound is mixed with a carbon material.
1. An electrode comprising:
Se 3 S or a selenium-containing polymer of Formula I or II;
wherein:
A is Se; and
x′ is an integer from 1-10, inclusive;
a carbon electronic conductor;
a current collector; and
a binder;
wherein:
the electrode is configured to operate at a temperature of less than 280° C.
2. The electrode of claim 1 , wherein the electrode is configured to operate at a temperature from about −100° C. to about 150° C.
3. The electrode of claim 1 , wherein the carbon electronic conductor comprises synthetic graphite, natural graphite, amorphous carbon, hard carbon, soft carbon, acetylene black, mesocarbon microbeads, carbon black, Ketjen black, mesoporous carbon, porous carbon matrix, carbon nanotube, carbon nanofiber, or graphene.
4. The electrode of claim 1 further comprising an electroactive transition metal chalcogenide, an electroactive conductive polymer, sulfur, or a sulfur-containing compound.
5. The electrode of claim 1 comprising the selenium containing polymer that is a polymer of Formula I.
6. The electrode of claim 1 comprising the selenium containing polymer that is a polymer of Formula II.
7. The electrode of claim 1 comprising Se 3 S.
8. The electrode of claim 1 , wherein the binder comprises polyvinylidene fluoride, polyvinyl alcohol, polyethylene, polystyrene, polyethylene oxide, polytetrafluoroethylene, polyacrylonitrile, polyimide, styrene butadiene rubber, carboxy methyl cellulose, gelatine, a copolymer of any two or more such polymers, or a blend of any two or more such polymers.
9. An electrochemical device comprising a cathode, wherein the cathode comprises a material comprising:
Se 3 S or a selenium-containing polymer of Formula I or II;
wherein:
A is Se; and
x′ is an integer from 1-10, inclusive;
wherein the material is an electroactive material at a temperature of below 280° C.
10. The electrochemical device of claim 9 that is a lithium primary battery, a lithium secondary battery, a sodium primary battery, a sodium secondary battery or a capacitor.
11. The electrochemical device of claim 10 further comprising an electrolyte and an anode.
12. The electrochemical device of claim 11 , wherein the electrolyte comprises a salt and a solvent.