Significant Constraints of SnO₂, SnS₂, and SnS₂/SnO₂ Heterostructures on Mitigating Polysulfide Shuttle Effects in Lithium‐Sulfur Batteries

Abstract

Abstract Lithium‐sulfur batteries (LSBs) are considered to be promising candidates for next‐generation energy storage devices because of high theoretical capacity of 1675 mAh g −1 . However, LSBs have failed to be put into practical applications mainly due to their shuttle effect. SnO 2 and SnS 2 stand out among many metal oxides and sulfides, and are frequently applied to LSBs research given their characteristics of easy preparation and good chemical stability. In particular, SnO 2 has a strong chemical adsorption effect on polysulfides through the S−Sn−O chemical bonds; SnS 2 can effectively reduce the electrochemical polarization and improve the redox efficiency of polysulfides. This Minireview summarizes and evaluates the latest research progress of SnO 2 , SnS 2 , and SnO 2 /SnS 2 heterostructures applied in LSBs including the cathode, separator, and interlayer. The three materials show excellent electrochemical performance and can serve as viable candidates for polysulfide immobilizers to deal with the shuttle effect in LSBs.