Polarization-Induced Effect Potentiated In Situ Polymerized Electrolyte for Solid-State Lithium Metal Batteries

Solid polymer electrolytes (SPEs) hold great promise for advancing next-generation lithium (Li) metal batteries owing to their facile processability and compositional flexibility. However, their practical applications are severely hindered by the low concentration of movable Li⁺ and poor interfacial stability. Herein, a polarization-induced effect potentiated in situ polymerized poly(1,3-dioxolane)-based electrolyte is designed. The polarized BaTiO₃ nanowires greatly promote the dissociation of Li salt to produce more movable Li⁺ by regulating the local electrostatic environment, thereby constructing high-throughput Li⁺ transport pathways. Crucially, this effect facilitates the weakening of the space charge layer and enhances the in situ polymerization of monomers, thereby establishing a stable electrolyte/electrode interface. The achieved electrolyte demonstrates an ionic conductivity of 1.68 mS cm⁻¹ at 25°C and a Li⁺ transference number of 0.766. Remarkably, the Li anode exhibits an extended cycling life of 2000 h in the Li||Li symmetric cell. The Li||LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) full cell retains 80.5% capacity after 500 cycles at 0.5C. Detailed interface analysis indicates that inorganic-rich solid electrolyte interface and cathode electrolyte interface are formed. This work offers a reliable design strategy for advanced lithium metal batteries with high safety and high-energy density.