Abstract
The rise of smart and flexible electrochemical devices requires the design of robust and highly ion conductive separators able to operate on a large temperature range. Polymeric ionic liquids (PILs), having ionic liquid-like species on their backbone, are promising to develop all-solid electrolyte but lead to compromises between ionic conductivity and mechanical properties. We copolymerized an ionic liquid monomer (ILM) with poly(ethylene glycol) dimethacrylate (PEGDM) to give rise to x-PIL networks. They can be used as polyelectrolyte from −46 °C to 220 °C. The most ion conducting x-PIL is 80/20 ILM/PEGDM (4.8 × 10−5 S·cm−1 at 25 °C). For mechanical improvement, it was associated with an epoxy-amine (EA) network via Interpenetrating Polymer Network (IPN). The IPNs have better hand tear resistance than x-PIL and are rubbery above 5 °C with E′ at 1 MPa. The EA network plays the role of a reinforcing scaffold without impacting ion conduction of 10−4 S·cm−1.
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