| Autor: |
Ma, Xinpei, Wang, Jinjie, Wang, Xianli, Zhao, Ling, Xu, Chengjun |
| Předmět: |
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| Zdroj: |
Journal of Materials Science: Materials in Electronics; Mar2019, Vol. 30 Issue 6, p5478-5486, 9p |
| Abstrakt: |
Hybrid metal-ion capacitors are designed to promote the energy density of supercapacitors with less sacrifice of power density. Zinc-ion hybrid supercapacitor, based on the multivalent ion storage principle, is a kind of energy storage device in which both the high energy density and power density can be achieved. Here, we propose a new configuration of zinc-ion hybrid supercapacitors composed of mild aqueous ZnSO4 electrolyte, activated carbon (AC) anode and V2O5 cathode. The operating voltage of the hybrid supercapacitor can reach to 2 V in the aqueous electrolyte when the mass ratio of AC to V2O5 is 1:1. The maximum energy density of zinc-ion hybrid capacitor is about 3.9 times higher than that of AC symmetric supercapacitor, while its maximum power density is 1.7 times higher than that of zinc-ion battery. The capacity retention of the hybrid supercapacitors is 97.3% over 6000 charge-discharge cycles at 0.5 A g−1. Compared with MnO2 zinc-ion hybrid supercapacitors system, the stable nature of V2O5 allows new zinc-ion hybrid supercapacitors system to achieve a better cycling performance. The unique electrochemical performance, low cost and high safety of the new zinc-ion hybrid supercapacitor endow it with a very wide range of applications in consumer electronics and stationary energy storage. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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