Polyethylene Oxide-Based Solid-State Polymer Electrolyte Hybridized with Liquid Catholyte for Semi-Solid-State Rechargeable Mg-O2 Batteries

This work introduces a hybrid semi-solid electrolyte of PEO polymer and liquid catholyte, enhancing Mg–O 2 battery performance by improving cathode-electrolyte interaction, anode protection, discharge capacity, and cycling efficiency.