Ternary Ionogel Electrolytes Enable Quasi?Solid?State Potassium Dual?Ion Intercalation Batteries

A dual-ion battery (DIB) is an emerging technology destined for use in stationary energy storage applications. Most DIB prototypes expensive salt-concentrated liquid electrolytes to ensure sufficient ion supply and electrochemical stability window beyond 4.5 V, which required anion intercalation graphite. Herein, the design of a compact quasi-solid-state potassium-based introduced using ternary ionogel (t-IGEs) prepared from potassium salt, ionic liquid, poly(ionic liquid). Among series combinations, t-IGE with optimum mechanical property, thermal (>200 °C), performance consists 30% 28% 42% With conductivity ranging 0.1 1 mS cm?1 at 30–100°C within 0.5–5.0 V versus K+/K, suited practical MoS2–graphite KDIBs. Infusing plain-weave glass fiber fabrics (?40 ?m thick) further enables more KDIBs significant reduction (?64%) electrolyte thickness achieved. The cells are able deliver specific capacities varying 80 25 mAh g?1 10 160 mA g?1, CEs ?90% 100%.