A star-shaped solid composite electrolyte containing multifunctional moieties with enhanced electrochemical properties for all solid-state lithium batteries

Limited ionic conduction and poor solid/solid interfacial stability are crucial characteristics that impede the practical application of solid polymeric electrolytes. Herein, a star-shaped solid composite electrolyte (SCE) containing multifunctional components, including anion-trapping boron moieties (B-PEGMA), poly(ethylene glycol) methyl ether methacrylate (PEGMEM) and octavinyl octasilsesquioxane (OV-POSS) nanofiller, was developed via a simple free radical polymerization method. The unique star-shaped structure induced by OV-POSS is beneficial to increasing the movement of polymer chains and forming continuously interconnected ion-conducting channels and the boron moieties can promote lithium salt dissociation and increase the effective transmission of Li+ in the electrolyte. This SCE exhibits an extremely high ionic conductivity of 3.44 x 10(-4) S cm(-1) and a high Li ion transference number of 0.58 at 25 degrees C, as well as excellent interfacial compatibility with the Li electrode leading to excellent rate performance and good cyclic stability in all-solid-state Li batteries.