Autonomous self-healing and high stretchable poly(lithium acrylate)-based hydrogel for energy storage applications
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Self-healing hydrogels were prepared through free radical polymerization of lithium acrylate monomer with the presence of vinyl silica nanoparticles as cross-linker and ammonium persulfate as initiator. The monomer was prepared by ion-exchanging acrylic acid with lithium hydroxide. Silica nanoparticles act as stress buffer to some degree strengthening the polymer network under strain, while hydrogen bonds contribute to self-healing properties of the hydrogel. Self-healing hydrogel polymer electrolytes were able to stretch up to 2000% and possessed high ionic conductivity of ~10-3 S/cm at room temperature. Morphology, mechanical properties, self-healing properties, and electrochemical properties were systematically investigated with Field Emission – Scanning Electron microscopy (FE-SEM), universal testing machine (UTM), rheometer, and electrochemical impedance spectroscopy (EIS), respectively.