Polyoxometalate Modified Separator for Performance Enhancement of Magnesium–Sulfur Batteries

The magnesium–sulfur (Mg-S) battery has attracted considerable attention as a candidate of post-lithium systems owing to its high volumetric energy density, safety, and cost effectiveness. However, the known shuttle effect soluble polysulfides during charge discharge leads rapid capacity fade hinders realization sulfur-based technology. Along with approaches for cathode design electrolyte formulation, functionalization separators can be employed suppress polysulfide shuttle. In this study, glass fiber separator coated decavanadate-based polyoxometalate (POM) clusters/carbon composite is fabricated by electrospinning technique impacts on performance suppression shuttling are investigated. Mg–S batteries such non-corrosive Mg[B(hfip)4]2 show significantly enhanced reversible cycling stability. Functional modification provides promising approach improving metal–sulfur batteries.