Robust Janus-Faced Quasi-Solid-State Electrolytes Mimicking Honeycomb for Fast Transport and Adequate Supply of Sodium Ions

Abstract

Quasi-solid-state electrolytes are one of the most promising alternative candidate for traditional liquid state electrolytes with fast ion transport rate, high mechanical strength and wide temperature adaptation. Here we designed a biomimicking electrolyte film with a Janus-faced honeycomb-like structure and apply it to sodium ion batteries. The advanced quasi-solid-state sodium ion batteries come out with an initial coulombic efficiency of 105% and stable charge-discharge cycles in a wide temperature range from -20 ℃ to 60 ℃. Also, operando observations on chemical structure and interfacial evolution have been operated to exhibit a robust and stable quasi-solid-state electrolyte film.