Ultrahigh Sulfur Loading Tolerant Cathode Architecture with Extended Cycle Life for High Energy Density Lithium–Sulfur Batteries

摘要

Lithium–sulfur batteries are regarded as the imminent energy storage devicefor high energy density applications. However, at practical sulfur loadings>5 mg cm~(?2), the cell suffers from severe capacity fade and durability. In thepresent work, a hybrid MoS_2–WS_2 heterodimensional structure is reported. Thestrain induced growth of transition metal dichalcogenides preferentially exposesedge sites and maximizes the geometric coverage for anchoring-diffusionconversionof polysulfides to restrain the shuttle effect at practical S-loadings.The systematic analysis (5–50 mg cm~(?2) of S-loadings) reveals that the uniquecathode architecture exhibits reversible S-loading tolerance up to 28 mg cm~(?2).A high initial areal capacity of 32 mAh cm~(?2) with an area specific energy densityof 67 mWh cm~(?2) is achieved with a low electrolyte volume/S-loading ratio of5 mL g~(?1). The strategy presented here can unlock high S-loading Li–S cells withextended cyclability and high energy density.