材料科学
超级电容器
电解质
锌
储能
化学工程
碳纤维
电极
电化学
准固态
功率密度
复合材料
冶金
复合数
化学
热力学
物理
工程类
物理化学
功率(物理)
色素敏化染料
作者
Zhiwei Li,Dong‐Hui Chen,Yufeng An,Chenglong Chen,Langyuan Wu,Zhijie Chen,Yao Sun,Xiaogang Zhang
标识
DOI:10.1016/j.ensm.2020.01.028
摘要
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.
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