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Chloride Ion-Containing Polymeric Ionic Liquids for Application as Electrolytes in Solid-State Batteries
Authors:Lisa Ehrlich  Doris Pospiech  Upenyu L. Muza  Albena Lederer  Julia Muche  Dieter Fischer  Petra Uhlmann  Felix Tzschöckell  Simon Muench  Martin D. Hager  Ulrich S. Schubert
Affiliation:1. Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany

Organic Chemistry of Polymers, Technische Universität Dresden, 01062 Dresden, Germany;2. Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany;3. Lehrstuhl für Organische und Makromolekulare Chemie (IOMC), Friedrich-Schiller-Universität Jena, Humboldtstraße 10, 07743 Jena, Germany

Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich-Schiller-Universität Jena, Philosophenweg 7a, 07743 Jena, Germany;4. Lehrstuhl für Organische und Makromolekulare Chemie (IOMC), Friedrich-Schiller-Universität Jena, Humboldtstraße 10, 07743 Jena, Germany

Abstract:Organic, solid-state batteries require efficient solid electrolytes able to provide stable ion conduction. Here, solid electrolytes based on ionic liquid (IL) polymers with chloride counterions as electrolyte materials for batteries are presented. Acrylic monomers with imidazolium substituents with alkyl side groups that are linked by alkyl spacers to the acrylic group are employed. The IL monomers with chloride counterions are either converted by thermally initiated radical polymerization into linear homopolymers or incorporated into polymer networks by UV-initiated copolymerization utilizing a bifunctional, non-ionic cross-linker. Both procedures successfully yielded the desired materials, which is confirmed by NMR spectroscopy (linear homopolymers) or Raman spectroscopy (IL networks). The ionic conductivities at room temperature are measured by Electrochemical Impedance Spectroscopy. The ionic conductivities of the linear homopolymers are in the range of 10−4 to 10−6 S cm−1, while those of the IL networks are about two orders of magnitude lower. They increase to 10−4 S cm−1 at 70 °C. The electrochemical stability is examined by Linear Sweep Voltammetry and is proven in the voltage range of −2 to +2 V. The results reveal that the materials represent promising electrolytes for potential solid-state battery applications.
Keywords:chloride-conducting polymers  electrochemical stability  polymeric ionic liquids  solid electrolytes
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