Mapping Polysulfides in Sodium-Sulfur Batteries.

ABSTRACT: Sodium-sulfur (Na-S) batteries provide lithium-free alternatives to lithium-sulfur (Li-S) batteries. Na-S chemistry has been less studied. Thus, the types of polysulfides (PS) and their evolution during charge-discharge of Na-S batteries are not as well understood as those in the Li-S system. We, therefore, study the formation of different PS in tetraethylene glycol dimethyl ether-based electrolyte during battery operation using in situ Raman and ex situ ultraviolet-visible (UV-vis) spectroscopies. We start by making reference solutions with different ratios of sodium sulfide (Na₂S) to sulfur, ranging from pure Na₂S to Na₂S:7S, with the sulfur ratio increasing by one integer per solution. We then correlate the UV-vis and Raman peaks to PS spec

SUBMITTER: Gray EL 

PROVIDER: S-EPMC11912571 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature