TY - JOUR
T1 - Flexible Supercapacitor Based on Organohydrogel Electrolyte with Long-Term Anti-Freezing and Anti-Drying Property
AU - Li, Xilong
AU - Lou, Dongyang
AU - Wang, Hongyang
AU - Sun, Xiaoyi
AU - Li, Juan
AU - Liu, You Nian
N1 - Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2020/12/22
Y1 - 2020/12/22
N2 - Hydrogel electrolytes have spurred the development of flexible energy storage devices by endowing them with liquid-like ion transport and solid-like mechanical elasticity. However, traditional hydrogel electrolytes always lose these functions in climate change because the internal water undergoes freezing and/or dehydration. In this work, a flexible supercapacitor (OHEC) is assembled based on the organohydrogel electrolyte (OHE) and activated carbon electrode material. The OHE is composed of PAMPS/PAAm double-network hydrogel soaked from 4 m LiCl/ethylene glycol and exhibits good conductivities (1.9 and 22.9 mS cm−1 at −20 and 25 °C, respectively). The OHEC exhibits broad temperature adaptability (from −20 to 80 °C) and extraordinary resistance to mechanical damage (above 100 kg crushing). The OHEC avoids the polarization at low temperatures and retains 77.8% capacitance retention after storage at −20 °C for 30 days. Without extra sealed packaging, the OHEC maintains remarkable cycling stability (only 8.7% capacitance decay after 10 000 cycles) and retains 77.3% capacitance at 80 °C after 56 h. The outstanding anti-drying performance and improved interfacial compatibility of OHEC account for the good durability in the high-temperature environments. Additionally, other salts (such as LiClO4, NaCl, and KCl) with favorable solubility in ethylene glycol can also serve in OHEs for wide temperature range supercapacitors.
AB - Hydrogel electrolytes have spurred the development of flexible energy storage devices by endowing them with liquid-like ion transport and solid-like mechanical elasticity. However, traditional hydrogel electrolytes always lose these functions in climate change because the internal water undergoes freezing and/or dehydration. In this work, a flexible supercapacitor (OHEC) is assembled based on the organohydrogel electrolyte (OHE) and activated carbon electrode material. The OHE is composed of PAMPS/PAAm double-network hydrogel soaked from 4 m LiCl/ethylene glycol and exhibits good conductivities (1.9 and 22.9 mS cm−1 at −20 and 25 °C, respectively). The OHEC exhibits broad temperature adaptability (from −20 to 80 °C) and extraordinary resistance to mechanical damage (above 100 kg crushing). The OHEC avoids the polarization at low temperatures and retains 77.8% capacitance retention after storage at −20 °C for 30 days. Without extra sealed packaging, the OHEC maintains remarkable cycling stability (only 8.7% capacitance decay after 10 000 cycles) and retains 77.3% capacitance at 80 °C after 56 h. The outstanding anti-drying performance and improved interfacial compatibility of OHEC account for the good durability in the high-temperature environments. Additionally, other salts (such as LiClO4, NaCl, and KCl) with favorable solubility in ethylene glycol can also serve in OHEs for wide temperature range supercapacitors.
KW - flexibility
KW - high-temperature performance
KW - low-temperature tolerance
KW - organohydrogel electrolytes
KW - supercapacitors
UR - http://www.scopus.com/inward/record.url?scp=85091283613&partnerID=8YFLogxK
U2 - 10.1002/adfm.202007291
DO - 10.1002/adfm.202007291
M3 - Article
AN - SCOPUS:85091283613
SN - 1616-301X
VL - 30
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 52
M1 - 2007291
ER -