Polymeric ionic liquid based interpenetrating polymer network for all-solid self-standing polyelectrolyte material

[Display omitted] •Polymeric ionic liquids promising for all-solid state electrolyte.•Copolymerized an ionic liquid monomer (ILM) with crosslinker to give x-PIL networks.•x-PIL networks as polyelectrolyte from −46 °C to 220 °C with good conductivities.•x-PIL associated with epoxy-amine network in Interpenetrating Polymer Network.•Reinforcing scaffold without impacting ion conduction. 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.