Single Alkaline‐Ion (Li<sup>+</sup>, Na<sup>+</sup>) Conductors by Ion Exchange of Proton‐Conducting Ionomers and Polyelectrolytes

Kreuer, Klaus‐Dieter; Wohlfarth, Andreas; Araújo, Carla C. de; Fuchs, Annette; Maier, Joachim

doi:10.1002/cphc.201100506

Cited by 63 publications

(60 citation statements)

References 25 publications

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“…[26][27][28][29][30][31][32][33][34][35] Protonsc an be exchanged with cations in salt solutions to yield various cation-conducting ionomers. [24,36] The use of other acidic groups,s uch as phosphonic acid, have also been described.…”

Section: Introductionmentioning

confidence: 99%

Low‐Permeability Poly(ether Ether Ketone)‐Based Ampholytic Membranes

et al. 2016

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Ion-exchange membranes based on sulfonated and sulfaminated poly(ether ether ketone) were prepared by a modified sulfamination route. In a first step, poly(ether ether ketone) was sulfonated. The sulfonic acid groups were then transformed into chlorosulfonic moieties by reaction with thionyl chloride. A proportion of the chlorosulfonic functionalities reacted with dimethylamine to give basic sulfonamide groups, whereas those remaining were hydrolyzed back to sulfonate moieties obtaining, after immersion in acidic solution, an ampholytic polymer. The thermal, mechanical, electrical, and permeability properties of these amphoteric membranes were characterized. These membranes exhibit good thermal and mechanical stability and ultra-low vanadium ion permeability. The type and value of ion conductivity can be adjusted by the choice of acidic or basic medium. The tunable ion conductivity and the low ion permeability are suitable characteristics for the development of high-performance separator membranes

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Section: Introductionmentioning

confidence: 99%

Low‐Permeability Poly(ether Ether Ketone)‐Based Ampholytic Membranes

et al. 2016

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“…Kreuer et al beschreiben neuartige Kationenleiter, die auf Natrium oder Lithiumsalzen von hochsulfonierten Polymeren in aprotischen Solventien basieren. Die Leiter werden als Alternative zu den in Batterien üblichen flüssigen Polyelektrolyten vorgeschlagen 37…”

Section: Polymerbasierte Materialienunclassified

Makromolekulare Chemie 2011

2012

Nachr Chem

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“…The anion conduction is thus water-assisted and the high dielectric constant solvent allows the dissociation of ion pairs;o ther high-permittivity solvents, such as DMSO, can also be used. [17] The nanophase separationo ft he ionic transport domains seems however less distinct than in protonexchange membranes. [18] Many proton, cation and anion conductors have been described, buto nly few studies on fluoride-ion-conducting polymers have been reported so far.V olkov et al [19] investigated fluoride-ion diffusion coefficients in commerciala nion-exchange resins and membranes by nuclear magnetic resonance (NMR) spectroscopy and found self-diffusion coefficients of the order of 10 À10 m 2 s À1 ,depending on the type of membrane.…”

Section: Introductionmentioning

confidence: 99%

Fluoride‐ion‐conducting Polymers: Ionic Conductivity and Fluoride Ion Diffusion Coefficient in Quaternized Polysulfones

et al. 2015

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We describe the three-step synthesis of a new polymeric fluoride ion conductor based on the fully aromatic polymer polysulfone (PSU). In the first step, PSU is chloromethylated (CM-PSU) using reagents (i.e., stannic chloride, paraformaldehyde, and trimethylchlorosilane) that are less toxic than those used in the standard procedure. In the second step, CM-PSU reacts with a tertiary amine (trimethylamine or 1,4-diazabicyclo[2.2.2]octane) to form quaternary ammonium groups fixed on the PSU backbone and mobile chloride counter-anions. The chloride ions can, in a third step, be exchanged with fluoride ions by immersion of the ionomer in NaF solution. The fluoride ion conductivity reaches 3-5 mS cm(-1) at 25 °C and 5-10 mS cm(-1) at 40 °C. We determined the F(-) diffusion coefficient in these ionomers by pulsed gradient spin-echo (PGSE) high-resolution magic angle spinning (HRMAS) nuclear magnetic resonance (NMR) spectroscopy and by impedance spectroscopy using the Nernst-Einstein relation. The diffusion coefficients determined by the two methods are in good agreement, ranging from 2 to 4×10(-10) m(2) s(-1) . The porosity and tortuosity of the ionomer membranes can be estimated.

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Single Alkaline‐Ion (Li⁺, Na⁺) Conductors by Ion Exchange of Proton‐Conducting Ionomers and Polyelectrolytes

Cited by 63 publications

References 25 publications

Low‐Permeability Poly(ether Ether Ketone)‐Based Ampholytic Membranes

Low‐Permeability Poly(ether Ether Ketone)‐Based Ampholytic Membranes

Makromolekulare Chemie 2011

Fluoride‐ion‐conducting Polymers: Ionic Conductivity and Fluoride Ion Diffusion Coefficient in Quaternized Polysulfones

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Single Alkaline‐Ion (Li+, Na+) Conductors by Ion Exchange of Proton‐Conducting Ionomers and Polyelectrolytes

Cited by 63 publications

References 25 publications

Low‐Permeability Poly(ether Ether Ketone)‐Based Ampholytic Membranes

Low‐Permeability Poly(ether Ether Ketone)‐Based Ampholytic Membranes

Makromolekulare Chemie 2011

Fluoride‐ion‐conducting Polymers: Ionic Conductivity and Fluoride Ion Diffusion Coefficient in Quaternized Polysulfones

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Single Alkaline‐Ion (Li⁺, Na⁺) Conductors by Ion Exchange of Proton‐Conducting Ionomers and Polyelectrolytes