Flexible and anti-freezing quasi-solid-state zinc ion hybrid supercapacitors based on pencil shavings derived porous carbon

By Zhiwei Li, Donghui Chen, Yufeng An, Chenglong Chen, Langyuan Wu, Zhijie Chen, Yao Sun, Xiaogang Zhang. Energy Storage Materials, 2020

342 citations recorded by the source corpus.

Abstract Aqueous zinc-ion batteries have been widely reported as promising candidates for energy storage, but the research on zinc-ion based supercapacitors or hybrid supercapacitors has received little attention and the energy storage mechanism is still controversial. Here, a high-performance zinc-ion hybrid supercapacitor is successfully demonstrated with biowaste-derived porous carbon and cheap zinc foil. Thanks to the bivalent characteristic of zinc and electric double layer capacitive nature of porous carbon, as-assembed hybrid supercapacitors can achieve high energy density of 147.0 ​Wh kg−1 at 136.1 ​W ​kg−1 and a maximum power density of 15.7 ​kW ​kg−1 at 65.4 ​Wh kg−1 together with outstanding cycling stability (92.2% capacity retention after 10000 cycles at a high current density of 10 ​A ​g−1). Most importantly, 61.6% of the initial capacity at 1 ​A ​g−1 can be remained even under a mass loading as high as 17 ​mg ​cm−2. Significantly, the phase composition of byproducts formed in Zn(CF3SO3)2 electrolyte have been confirmed by ex-situ experimental results and theoretical calculations. Besides, when appling optimized carbon cathode into quasi-solid-state hybrid supercapacitors with a unique anti-freezing hydrogel electrolyte, this device can well service at various bending states and relatively low temperature of −15 ​°C.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/916fc80ffed7a65c7728489d5660262aae7a458c