Synthesis And Application Of Ionic Liquid-Based Self-Healing Gel

Ionic liquids(ILs)are a type of cation/anion pairs with melting temperature below 100?.They have attracted much attention due to their unique properties,such as negligible vapor pressure,high conductivity,high thermal and chemical stability,good aqueous solubility,and a wide electrochemical stability window.Poly(ionic liquid)s(PILs)are polymerized ILs that containing a polymeric backbone and an IL species in monomer repeating units,A novel multifunctional IL-based gel is designed and synthesized via one-pot polymerization The gels show the excellent self-healing capacity due to electrostatic interaction between anions and cations.Combining the advantages of ionic gels with electronic devices,the gels have shown widely potential applications in lithium-ion battery,supercapacitor and electronic skin.The main research work is summed as the follows:(1)Design and synthesis of self-healing gel based on imidazolium-type ionic liquid.Firstly,a conductive and stretchable ionic gel with good self-healing ability was successfully prepared.The imidazoium type IL with di-hydroxyl group serving as bridged linkage,and provided reversible dynamic covalent bonds and electrostatic interaction with anions in the gel.We further demonstrated the conductive ionic gel could be applied in lithium-sulfur battery because of the existence of sulfonate anions which could alleviate the migration of electronegative polysulfide.(2)Self-healing double network gel based on ionic liquid for zinc-ion supercapacitor.Firstly,a conductive double network gel with self-healing capacity was synthesized.The first crosslinking network was introduced by coordination interaction between pyridine group and zinc ion.The secondary crosslinking network was formed via co-polymerization between ZIW and AM.The interlocking structure was formed by imidazolium cations and sulfonate anions among polymer chains,providing electrostatic interaction.Coordination and electrostatic interaction endow gels with self-healing ability.In addition,the network gel was applied in zinc-ion hybrid supercapacitor,which showed excellent self-healing capacity and electrochemical properties.We believe that the supercapacitor will offer a new platform for developing of smart self-healing devices.