A mechanically robust porous single ion conducting electrolyte membrane fabricated via self-assembly

Fluorinated polysulfonamide based single ion conducting room temperature applicable gel-type polymer electrolytes for lithium ion batteries

“…For equally prepared membranes the morphology may be either highly porous or rather dense based on the chemical structure of the SIPE, depending on the compatibility of the two polymer blend compounds. 26,41,42 Regarding the polymer membranes with composition 1 : 3, ionic conductivities of 0.5 mS cm À1 and 1.08 mS cm À1 were achieved at 20 C and 60 C, respectively, which are among the highest values obtained for similar polymer blends comprised of PVdF-HFP and polysulfonamide based single Li-ion polymers. 26,27,[40][41][42][43][44] It should be noted that the ionic conductivity measured here is based on the conduction of only lithium ions as no residual solvent or impurities of the synthesis are present that could otherwise contribute to the overall ionic conductivity.…”

“…The synthesis of the bis(4-methy benzene sulphonyl)imide monomer (1) was achieved based on the Hinsberg reaction in previous work. 26,27,[42][43][44][45]50 Using aqueous media for the reaction of the highly reactive sulfonyl chloride, however, oen results in signicantly reduced reaction yields (about 40%) due to a high degree of side reactions. Therefore, the Einhorn reaction was performed in anhydrous pyridine.…”

“…Lithiation of the polymer (4). The preparation of lithiated polymers based on the polysulfonamide monomer was oen achieved upon application of lithium hydroxide (LiOH) in previous reports, 26,27,[40][41][42][43][44][45][46][47] despite the fact that the corresponding 1 H NMR spectra of the polymers exhibited signicant signals at 3.33 pm, clearly indicating the unintentional presence of either unreacted LiOH or residual water. Since the uorinated single ion conducting polymer introduced in this work shows good solubility in THF compared to polysulfonamides containing other functional groups, successful lithiation was achieved with 1 M lithium bis(trimethylsilyl)amide.…”

“…E-mail: g.brunklaus@fz-juelich.de polysulfonylamide anionic moieties in the polymer backbone. 26,27,[40][41][42][43][44][45][46][47] Due to its good mechanical properties demonstrated from application as a gel-type polymer electrolyte in lithium ion batteries, 48,49 PVdF-HFP was proposed as a possible blend partner. The membranes were fabricated by a solution cast method, yielding porous structures that were further plasticized with a salt-free and thermally stable solvent solution such as EC : PC or EC : DEC, respectively.…”

“…Based on signicant signals at 3.33 pm in the corresponding 1 H NMR spectra of the resulting materials in DMSO-(d 6 ), 26,27,[40][41][42][43][44][45][46][47] an unintentional but substantial presence of either residual water or unreacted lithium hydroxide within the polymers has to be assumed, even though for long-term battery application, extraordinary high purity and anhydrous electrolytes are essential in order to avoid continuous material degradation, while facilitating high electrochemical performance of lithium metal cells. Herein, we introduce a homopolymer containing polysulfonylamide moieties at the polymer backbone, which was tailored by introducing a -C(CF 3 ) 2 functional group (Fig.…”