Highly Concentrated Asymmetric KTFSI for Aqueous Potassium Ion Batteries
Thileep Kumar Kumaresan,
Amol Bhairuba Ikhe,
Woon‐Bae Park
et al.
Abstract:Potassium imide salt (KCTFSI), featuring cyano (C≡N) and trifluoromethanesulfonyl (TFSI) branches, is reported for the first time as a promising electrolyte for aqueous potassium‐ion batteries (KIBs). In contrast to the limited solubility of symmetric KTFSI (1.5m), asymmetric KCTFSI achieves a high saturation concentration of 32.2m within a “water‐in‐salt” region. Experimental and theoretical studies reveal that the remarkable enhancement of solubility is associated with the asymmetry of CTFSI anions and likel… Show more
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