Synergistic ion transport facilitated by one-dimension wollastonite in solid polymer electrolytes for stable lithium metal batteries

Solid polymer electrolytes suffer from relatively low Li+ conductivity, poor mechanical strength and interfacial incompatibility with electrodes, which hinder their further application in solid-state batteries. In this work, one -dimension (1D) wollastonite fillers are introduced into the solid polymer electrolyte, which not only contribute to the improved mechanical strength and electrochemical window, but also effectively inhibit polymer crys-tallization. More importantly, the abundant Lewis sites at wollastonite surface provide 1D ion pathway to boost ion transport in the electrolyte, achieving high ionic conductivity and Li+ transfer number. Owing to these favorable properties, the as-prepared polymer electrolyte exhibits enhanced interfacial stability toward Li anode, enabling long-term cycling in a Li-Li symmetric cell without short circuit. Showing good interfacial compatibility with both LiFePO4 and LiCoO2 cathode materials, the modified polymer electrolyte delivers high rate capability (143 mAh g-1 at 5C) and stable cycling performance (capacity retention of 93.12% after 380 cycles) in full cells. Through regulating the interfacial interactions between polymer matrix and fillers, this work points out a new direction towards high-performance all-solid-state batteries.