Patent ID: 11876188
Assignee: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 18:
19. A method of improving cycling life of a sodium-sulfur cell, wherein the sodium-sulfur cell comprising a sodium anode, a sulfur cathode, and an electrolyte containing a sodium salt dispersed in an alkyl carbonate solvent, the method comprising:
introducing one or more additives into said electrolyte, each additive independently capable of forming a sodium alloy interphase on a surface on the sodium anode; and
wherein the one or more additives independently comprise at least one metal or metalloid cation having a standard reduction potential which is at least 2.5V more positive than that of sodium cation; and wherein the at least one metal or metallic cation is provided in a concentration of 20 mM to 100 mM.