A Review on Catalytic Progress of Polysulfide Redox Reactions on Transition Metal Sulfides in Li‐S Batteries from Structural Perspective

The commercialization of Li−S batteries is seriously hindered by polysulfides with severe shuttle effect, and the inherent insulating properties and slow reaction kinetics of insoluble Li2S products. Transition metal sulfides (TMSs) have a high adsorption capacity for polysulfides and have been shown to have a strong catalytic effect on polysulfide conversion reactions. This paper reviews the research on the application of Unary TMSs, heterostructures, etc. in Li−S batteries, and gives some research methods for TMD catalysts in Li−S batteries. Finally, it points out the main focuses and direction of future Li−S battery research and development. It aims to provide some insights into the design and manufacture of advanced Li−S batteries for commercial use. The excellent theoretical performance of Li−S batteries deserves attention. However, the poor sulfur conductivity, volume change induced electrode failure and shuttle effect at the cathode limit the battery from being introduced. Among many catalysts, TMSs utilize their strong binding force to accelerate the conversion of polysulfides, making them of extraordinary research value.