Metal sulfide electrodes and energy storage devices thereof
The present invention generally relates to energy storage devices, and to metal sulfide energy storage devices in particular. Some aspects of the invention relate to energy storage devices comprising at least one flowable electrode, wherein the flowable electrode comprises an electroactive metal sulfide material suspended and/or dissolved in a carrier fluid. In some embodiments, the flowable electrode further comprises a plurality of electronically conductive particles suspended and/or dissolved in the carrier fluid, wherein the electronically conductive particles form a percolating conductive network. An energy storage device comprising a flowable electrode comprising a metal sulfide electroactive material and a percolating conductive network may advantageously exhibit, upon reversible cycling, higher energy densities and specific capacities than conventional energy storage devices.
1. An electrode, comprising:
a sulfur or metal sulfide active material suspended or dissolved in a fluid; and
a percolating conductive network comprising electronically conductive particles suspended in the fluid, wherein the electronically conductive particles are electronically connected, and wherein electronic charge carriers can be transported throughout the percolating conductive network via the electronically conductive particles.
2. The electrode of claim 1 , wherein the electronically conductive particles comprise carbon.
3. The electrode of claim 1 , wherein the metal sulfide comprises a lithium sulfide, a magnesium sulfide, a zinc sulfide, a sodium sulfide, or combinations thereof.
4. The electrode of claim 1 , wherein the fluid comprises dimethoxyethane (DME).
5. The electrode of claim 1 , wherein the fluid comprises dioxolane (DOL).
6. The electrode of claim 1 , wherein the electrode composition comprises sulfur infiltrated into mesoporous carbon.
7. The electrode of claim 1 , comprising lithium bis(Trifluoromethanesulfonyl)Imide (LiTFSI).
8. A battery comprising the electrode of claim 1 .
9. The battery of claim 8 , further comprising a second electrode.
10. The battery of claim 9 , wherein the second electrode comprises an active material comprising lithium.
11. The battery of claim 9 , wherein the second electrode comprises lithium metal.
12. The battery of claim 9 , wherein the second electrode is a stationary electrode.
13. The battery of claim 9 , wherein the second electrode is a flow electrode.