Sulfone-based high-voltage electrolytes for high energy density rechargeable lithium batteries:Progress and perspective

Further enhancement in the energy density of rechargeable lithium batteries calls for high-voltage cathode materials and stable anodes,as well as matched high-voltage electrolytes without compromising the overall property of batteries.Sulfone-based electrolytes have aroused great interest in recent years owing to their wide electrochemical window and high safety.However,significant challenges such as the complexity of synthesis,high melting point(typically above room temperature),high viscosity,and their poor compatibility with graphite-based anodes have drastically impeded their practical applications.In this review,recent progress of sulfone solvents in high energy density rechargeable lithium batteries is summarized theoretically and experimentally.More importantly,general improvement methods of sulfone-based electrolytes,such as adding additives and cosolvents,structural modifications of sulfo ne,superconcentrated salt strategy are briefly discussed.We expect that this review provides inspiration for the future developments of sulfone-based high-voltage electrolytes(SHVEs) and their widespread applications in high specific energy lithium batteries.     

Recent advances of newly designed in-situ polymerized electrolyte for high energy density/safe solid Li metal batteries

It is revealed that the application of commercial liquid organic electrolytes encountered increasing safety hazards to achieve higher energy density. The replace of solid electrolytes could eliminate most safety issues induced by liquid electrolytes. However, both solo polymer electrolyte and inorganic electrolyte have difficulty to simultaneously acquire high ionic conductivity and good interfacial compatibility. At this circumstance, in-situ polymerization is developed to construct a compatible interface with high ionic conductivity and improved safety performances. In this review, recent advances of newly designed electrolyte are summarized and discussed. It is realized that the polymerization conversion of monomer and construction of 3D inorganic structure are the factors deserve consideration for high security and energy density. Finally, the challenges and future perspectives are outlined to foresee the development of in-situ polymerized electrolytes.