Low temperature sulfur and sodium metal battery for grid-scale energy storage application

1. A re-chargeable battery comprising:

a non-dendrite forming sodium (Na)/potassium (K) liquid metal alloy anode;

a sulfur and polyacrylonitrile (PAN) conductive polymer composite cathode;

a polyethyleneoxide (PEO) solid electrolyte;

a solid electrolyte interface (SEI) directly in contact with the PEO solid electrolyte, wherein the PEO solid electrolyte completely surrounds the sulfur and PAN composite cathode; and

a cell housing, wherein the anode, cathode, and electrolyte are assembled into the cell housing.

2. The re-chargeable battery of claim 1 , wherein the PEO solid electrolyte comprises a sodium triflate salt and a potassium triflate salt.

3. The re-chargeable battery of claim 1 , wherein a potassium concentration in the sodium and potassium alloy is approximately 40% K to 90% K by weight.

4. The re-chargeable battery of claim 2 , wherein the sodium and potassium liquid metal alloy is approximately 56% K and 44% Na by weight.

5. The re-chargeable battery of claim 1 , wherein the PEO is cross-linked.

6. The re-chargeable battery of claim 5 , wherein the PEO is UV cross-linked with a benzophenone initiator.

7. The re-chargeable battery of claim 1 , wherein the PEO solid electrolyte is a Na/K ion conducting membrane.

8. The re-chargeable battery of claim 1 , wherein the PEO solid electrolyte prevents the anode from contacting the cathode.

9. The re-chargeable battery of claim 1 , wherein the PEO oxygen to Na ion ratio is at 20:1 and the PEO oxygen to K ion ratio is at 20:1.

10. The re-chargeable battery of claim 1 wherein the anode comprises a copper Cu current collector.

11. The re-chargeable battery of claim 1 , wherein the cathode comprises an aluminum Al current collector.