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

Edström, Kristina,Professor,1958-Uppsala universitet,Strukturkemi(Swepub:uu)ked02526 (författare)
Brandell, Daniel,1975-Uppsala universitet,Strukturkemi(Swepub:uu)dbr10334 (författare)
Asfaw, Habtom Desta,Dr.1986-Uppsala universitet,Strukturkemi(Swepub:uu)habas570 (författare)
Uppsala universitetStrukturkemi (creator_code:org_t)

Ingår i:Advanced Energy and Sustainability Research: John Wiley & Sons3:1, s. 2100122-2699-9412

Av författaren/redakt...: Kotronia, Antoni ...; Edström, Kristin ...; Brandell, Daniel ...; Asfaw, Habtom De ...

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