Adhesive Triple-Network-Polymer Hydrogel Electrolytes (TPHEs)for Flexible Supercapacitors with Superior Low Temperature Characteristics
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초록
내용
Since hydrogel electrolytes (HEs) have liquid-like ion transfer capability and solid-like mechanical properties, many studies are being conducted to apply HEs energy storage devices. In this work, we prepare triple-network-polymer hydrogel electrolytes (TPHEs)-based flexible supercapacitors, composed of LiA, LMA, BMA, and LiCl, are assembled with activated carbon electrodes. We thoroughly investigate the effect of LiCl content on the TPHEs ionic conductivity, so that the TPHE with 75 mol% LiCl exhibits outstanding ionic conductivity at high (1.1×10-1S/cm at 50℃) and even low (5.4×10-3 S/cm at -30℃) temperatures. The resultant TPHE-based supercapacitors not only, show excellent adhesion strength (55J/m2) between electrode and electrolyte, but also exhibit steady electrochemical performance with ~100% capacitance retention under bending deformation. As a result, it shows remarkable cycling performance above 90% of the initial capacitance even after 10,000 cycles.