Evoking High Donor Number-assisted and Organosulfur-mediated Conversion in Lithium-Sulfur Batteries.

ABSTRACT: The solution-mediated behavior of lithium-sulfur (Li-S) batteries presents a wide range of opportunity for evaluating and improving the performance at practical lean-electrolyte conditions. Here, we introduce methyl trifluoroacetate (CH₃TFA) as an additive to the Li-S electrolyte to evaluate the joint effects of two distinct strategies: high donor number solvents/salts and organosulfur-mediated discharge. CH₃TFA is shown to react with lithium polysulfides in-situ to form lithium trifluoroacetate (LiTFA) and dimethyl polysulfides. We find that both the methyl group and trifluoroacetate anion considerably enhance Li-S discharge behavior over the course of cycling, though they have distinctly beneficial effects. The TFA anion impacts solution coordination behavior

SUBMITTER: Gupta A 

PROVIDER: S-EPMC8243416 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature