Superconcentrated NaFSA-KFSA Aqueous Electrolytes for 2 V-Class Dual-Ion Batteries.

ABSTRACT: Superconcentrated aqueous electrolytes containing NaN(SO₂F)₂ and KN(SO₂F)₂ (for which sodium and potassium bis(fluorosulfonyl)amides (FSA), respectively, are abbreviated) have been developed for 2 V-class aqueous batteries. Based on the eutectic composition of the NaFSA-KFSA (56:44 mol/mol) binary system, the superconcentrated solutions of 35 mol kg^-1 Na_0.55K_0.45FSA/H₂O and 33 mol kg^-1 Na_0.45K_0.55FSA/H₂O are found to form at 25 °C. As both electrolytes demonstrate a wider potential window of ∼3.5 V compared to that of either saturated 20 mol kg^-1 NaFSA or 31 mol kg^-1 KFSA solution, we applied the 33 mol kg^-1 Na_0.45K<

SUBMITTER: Hosaka T 

PROVIDER: S-EPMC9136840 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature