Interconvertible and rejuvenated Lewis acidic electrolyte additive for lean electrolyte lithium sulfur batteries.

ABSTRACT: Realizing practical lithium-sulfur batteries with high energy density requires lean electrolyte design. However, under low electrolyte/sulfur (E/S) ratios, highly concentrated lithium polysulfides in the electrolyte phase limit cycling and capacity. Here, we report that a small amount of Lewis acidic calcium cation in the electrolyte addresses the problems of lean electrolyte lithium-sulfur batteries. Because of its Lewis acidity, Ca²⁺ readily converts lithium polysulfides into CaS and S₈, preventing electrolyte jamming, polysulfide shuttle and Li corrosion. The in situ-formed CaS catalyzes the reduction reaction of lithium polysulfides. Ca²⁺ rejuvenates via electrochemical oxidation of CaS during charging, enabling a sustainable interconversion between Ca<

SUBMITTER: Cho H 

PROVIDER: S-EPMC12289984 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature