High-stretchable and self-healing lithium acrylate-based hydrogel polymer electrolytes for hybrid fiber supercapacitors
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Even though hydrogels are famous due to their high-ionic conductivity, their poor mechanical properties and fast water evaporation still become prominent issues to meet the requirements of multifunctional supercapacitors. Here, we report high-ion conducting, stretchable, and self-healable lithium acrylate-based nanohybrid polymer electrolytes (NPEs). The NPE was prepared by radical polymerization between poly(lithium acrylate) containing lithium countercations and vinyl silica nanoparticles. Due to strong binding energy between Li+ and H2O, the NPEs produce high ionic conductivities of ~10-1 at 25 oC and ~10-3 S/cm at 0 oC. The NPE-based fiber supercapacitor (FSC) shows a high specific capacitance of 51 F/g, with high power density (~6 kW/kg) and high energy density (~44 Wh/kg) in a wide voltage range of 2.5 V. The FSCs show mechanical stability under stretching, bending, and cutting/healing, and the capacitance retention still retains ~92%.