Advanced batteries require electrolyte and interfacial materials that can deliver fast ion transport, long-term stability, and safe operation. Our research focuses on the design of solid-state, polymer, and hybrid electrolytes for lithium and sodium batteries, with particular emphasis on understanding ion transport, interphase formation, and degradation mechanisms. We investigate sulfide, halide, and polymer-based ionic conductors using advanced electrochemical and operando characterization techniques to establish structure-property-performance relationships. In collaboration with Prof. Cyrille Boyer, we also develop functional polymer materials and polymer-based electrolyte platforms that combine mechanical robustness, processability, and high ionic conductivity. Through this combined effort, we aim to enable safer, longer-lasting, and higher-energy-density battery technologies.