Self-recovering and Anti-freezing Hydrogel Electrolytes for Robust Electrical Double-layer Capacitors
발표자
()
초록
내용
Hydrogel electrolytes have attracted widespread attention in energy storage devices. However, it remains challenges to work under extreme temperatures and interfacial adhesion with long-term stability. Herein, anti-freezing and self-recoverable infiltrated electrical double-layer capacitors (i-EDLCs) were fabricated via one-pot synthesis of KOAc WiSE-based polyacrylamide (PAAm) hydrogel electrolytes (HEs). Because infiltrated HEs tightly grab carbon electrode, i-EDLCs shows superior mechanical robustness against external forces. Additionally, long-term stability was significantly improved at -20 ℃. 92.3% of energy was retained at -20 ℃ whereas only 62.6% of energy was retained after 5,000 cycles of galvanostatic charge/discharge at 1.7 V. Furthermore, we analyzed self-recovery property of i-EDLCs. By simply keeping in an ambient air with relative humidity of 40%, i-EDLCs captured moisture from the air and recovered their energy up to 94.6% of bare cell after 20 h.