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.