Advancements in Battery\nMaterials: Bio-Based and Mineral\nFillers for Next-Generation Solid Polymer Electrolytes

The state-of-the-art all-solid-state batteries are expected\nto\nsurpass conventional flammable Li-ion batteries, offering high energy\ndensity and safety in an ultrathin and lightweight solvent-free polymeric\nelectrolyte (SPE). Nevertheless, there is an urgent need to boost\nthe room-temperature ionic conductivity and interfacial charge transport\nof the SPEs to approach practical all-solid-state devices. Accordingly,\nloading filler grains into SPEs has been well-documented as a versatile\nstrategy, promoting the overall electrochemical performance. In this\nera, using natural resources to extract filler additives has attracted\ntremendous attention to curb fossil fuel dependency. Also, there is\na growing preference for materials that impose minimal environmental\nharm, are sustainable, and exhibit environmentally friendly characteristics.\nTherefore, mineral and biobased fillers, as natural-based additives,\nare strong candidates to replace traditional petroleum-based synthetic\nmaterials. Herein, we conduct a systematic investigation into the\nion-transport mechanisms and fundamental properties of the filler-loaded\nSPEs. Additionally, recent advances in SPE architectures through embedding\nmineral and biobased fillers, as well as their hybrid compositions,\nare focused. Finally, the downsides and future directions are highlighted\nto facilitate further development and research toward revitalizing\n rechargeable battery-related technology. Overall, efficient methods\nfor modifying SPEs through the use of natural resource organic and\ninorganic fillers are discussed, and technological advancements and\nrelated challenges are emphasized. Following the provided rational\nsolutions to overcome major obstacles faced by SPEs, we hope to meet\nthe demands of a greener future.