Fluorinated Aryl Sulfonimide Tagged (FAST) salts: modular synthesis and structure–property relationships for battery applications

Abstract

Fluorinated Aryl Sulfonimide Tag (FAST) anions provide a new class of modular salts with tunable properties for potential battery applications.

Conformational design concepts for anions in ionic liquids

“… 97 The same concept can also help with the preselection of ions from an already available platform, such as the fluorinated aryl sulfonimide tagged anions. 98 …”

Molecular Design of Stable Sulfamide- and Sulfonamide-Based Electrolytes for Aprotic Li-O2 Batteries

“…21 However, the utility of these compounds as chemically and electrochemically stable electrolyte components in aprotic Li-O 2 batteries has not, to our knowledge, been examined. Guided by a comprehensive stability framework for organic molecules in the Li-O 2 oxygen electrode environment and the structure-stability relationships obtained from our previous works, 16,22 we designed the structures of these electrolyte components to be devoid of (1) vulnerable C-H bonds for hydrogen and proton removal, (2) electrophilic centers susceptible to nucleophilic substitution, and (3) highly electron-donating functional groups vulnerable to electrochemical oxidation. In this study, these three compounds were shown both experimentally and computationally (Figure S1) to exhibit exceptional stability toward a variety of harsh conditions encountered in the Li-O 2 cathode environment.…”

“…The chemical stabilities of BTMSA, DMCF 3 SA, and BMCF 3 SA were evaluated under conditions mimicking the oxygen electrode of aprotic Li-O 2 batteries according to a previously established protocol. 16,22 These electrolyte components were combined with 0.5 equiv lithium peroxide (Li 2 O 2 ) and KO 2 powders, and the resulting mixtures were stirred at 80 C for 3 days. The lack of appreciable change in the 1 H NMR spectra collected before and after the exposure to Li 2 O 2 and KO 2 (Figures 3A-3C) indicate that these compounds are highly resistant to chemical degradation by peroxide and superoxide, in good agreement with our computational analyses (Figure S1).…”

Understanding Enhanced Ionic Conductivity in Composite Solid‐State Electrolyte in a Wide Frequency Range of 10–2–1010 Hz

“…[ 16,17 ] Specifically, ion conductivity of composite SSEs can be improved by using a suitable lithium salt with both high oxidation stability and high dissociation degree. [ 12 ] In addition, oligomer polymers, including poly(ethylene glycol) (PEO)‐based polymers, [ 15 ] ethylene carbonates, [ 18 ] propylene carbonates [ 14 ] among others, have been added in the matrix of the composite SSEs as the plasticizer. The added plasticizer can decrease the crystallinity of PEO and the activation barrier of ion migration, thus increasing ion mobility.…”