期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 18, 页码 15541-15548出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b03223
关键词
self-healable supercapacitor; cold resistance; multifunctional hydrogel electrolyte; sodium alginate; dynamic catechol-borate bonding
资金
- National Natural Science Foundation of China [51473041]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51521003]
- self-planned task of the State Key Laboratory of Robotics and Systems of Harbin Institute of Technology [SKLRS201604C]
Excellent self-healability and cold resistance are attractive properties for a portable/wearable energy-storage device. However, achieving the features is fundamentally dependent on an intrinsically self-healable electrolyte with high ionic conduction at low temperature. Here we report such a hydrogel electrolyte comprising sodium alginate cross-linked by dynamic catechol borate ester bonding. Since its dynamically cross-linked alginate network can tolerate high-content inorganic salts, the electrolyte possesses excellent healing efficiency/cyclability but also high ionic conduction at both room temperature and low temperature. A supercapacitor with the multifunctional hydrogel electrolyte completely restores its capacitive properties even after breaking/healing for 10 cycles without external stimulus. At a low temperature of -10 degrees C, the capacitor is even able to maintain at least 80% of its room-temperature capacitance. Our investigations offer a strategy to assemble self-healable and cold-resistant energy storage devices by using a multifunctional hydrogel electrolyte with rationally designed polymeric networks, which has potential application in portable/wearable electronics, intelligent apparel or flexible robot, and so on.
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