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Evaluation of Electrochemical Stability of Graphite Current Collector for Electric Double Layer Capacitor Based on Acid Electrolyte

Authors
Park, SijinAn, Geon-Hyoung
Issue Date
May-2021
Publisher
MATERIALS RESEARCH SOC KOREA
Keywords
energy material; electric double layer capacitor; electrolyte; graphite current collector
Citation
KOREAN JOURNAL OF MATERIALS RESEARCH, v.31, no.5, pp.272 - 277
Indexed
SCOPUS
KCI
Journal Title
KOREAN JOURNAL OF MATERIALS RESEARCH
Volume
31
Number
5
Start Page
272
End Page
277
URI
https://scholarworks.bwise.kr/gnu/handle/sw.gnu/3779
DOI
10.3740/MRSK.2021.31.5.272
ISSN
1225-0562
Abstract
Owing to its low cost, easy fabrication process, and good ionic properties, aqueous supercapacitors are under strong consideration as next-generation energy storage devices. However, the limitation of the current collector is its poor electrochemical stability, leading to low energy storage performance. Therefore, a reasonable design of the current collector and the acidic electrolyte is a necessary, as well as interfacial engineering to enhance the electrochemical performance. In the present study, graphite foil, with excellent electrochemical stability and good electrical properties, is suggested as a current collector of aqueous supercapacitors. This strategy results in excellent electrochemical performance, including a high specific capacitance of 215 F g(-1) at a current density of 0.1 A g(-1), a superior high-rate performance (104 F g(-1) at a current density of 20.0 A g(-1)), and a remarkable cycling stability of 98 % at a current density of 10.0 A g(-1) after 9,000 cycles. The superior energy storage performance is mainly ascribed to the improved ionic diffusion ability during cycling.
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융합기술공과대학 (에너지공학과)
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