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2021 Vol.31, Issue 5 Preview Page
Evaluation of Electrochemical Stability of Graphite Current Collector for Electric Double Layer Capacitor Based on Acid Electrolyte

산성 전해질 기반의 전기 이중층 커패시터용 흑연 집전체의 전기화학적 안정성 평가

Sijin Park1
,
Geon-Hyoung An12†
박 시진1
,
안 건형12†
1Department of Energy Engineering, Gyeongsang National University, Jinju, Republic of Korea
2Future Convergence Technology Research Institute, Gyeongsang National University, Jinju, Republic of Korea
1경상국립대학교 에너지공학과
2경상국립대학교 미래융복합기술연구소
†Corresponding author E-Mail : ghan@gnu.ac.kr (G.-H. An, Gyeongsang Nat'l Univ.)
May 2021. pp. 272-277
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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.

Keywords
energy material
electric double layer capacitor
electrolyte
graphite current collector
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 31
  • No :5
  • Pages :272-277
  • Received Date : 2021-04-01
  • Revised Date : 2021-04-15
  • Accepted Date : 2021-04-16
  • DOI :https://doi.org/10.3740/MRSK.2021.31.5.272
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