Salt Concentration Control of Polysulfide Dissolution, Diffusion, and Reactions in Lithium-Sulfur Battery Electrolytes.

ABSTRACT: Lithium-sulfur (Li-S) batteries suffer from the dissolution of sulfur and polysulfide (PS) species in the electrolyte, leading to capacity loss, instability, and a shortened lifespan. While highly concentrated electrolytes have been explored to address this issue, the underlying mechanisms of S/PS dissolution and subsequent diffusion, particularly concerning the specific behavior of long- and short-chain PSs under varying states of charge (SOC), remain poorly understood. We here employ operando Raman spectroscopy to semiquantitatively monitor PS solubility and migration across a wide range of LiTFSI concentrations in DME:DOL (1:1, v/v). We find that both PS dianions (S_4-8 ^2-) and trisulfur radicals (S₃ ^•-) decrease at the lithium anode wit

SUBMITTER: Luong NT 

PROVIDER: S-EPMC12606560 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature