Combination of Alkali-Treated Soft Carbon and Activated Carbon Fiber Electrodes for Asymmetric Electric Double-Layer Capacitor

• KIM In-Tae

  Department of Applied Chemistry, Graduate School of Science and Engineering, Yamaguchi University

• EGASHIRA Minato

  Department of Applied Chemistry, Graduate School of Science and Engineering, Yamaguchi University

• YOSHIMOTO Nobuko

  Department of Applied Chemistry, Graduate School of Science and Engineering, Yamaguchi University

• MORITA Masayuki

  Department of Applied Chemistry, Graduate School of Science and Engineering, Yamaguchi University

抄録

An asymmetric combination of alkali-treated soft carbon (ASC) with activated carbon fiber (ACF) electrodes has been utilized to develop a novel electric double-layer capacitor (EDLC). The capacitance of ASC electrode was significantly increased after electrochemical activation at the first high potential cycling. Electrochemical measurements were carried out by charge-discharge polarization and ac impedance methods using a 3-electrode cell with propylene carbonate (PC) dissolving 1.0 M tetrafluorobrate (BF₄⁻) salt of tetraethylammonium (TEA⁺) or lithium (Li⁺). The charge-discharge performance of the cell that consists of ASC as the negative and ACF as the positive electrodes with TEABF₄ electrolyte, denoted as ASC(−)/TEABF₄(PC)/ACF(+), showed higher specific capacitance than other systems for the cycling in the voltage range of 0.0–3.0 V. The cell using LiBF₄ electrolyte, ASC(−)/LiBF₄(PC)/ACF(+), gave poor capacitance behavior probably due to undesirable electrolyte decomposition at the positive electrode. The ACF(−)/ASC(+) cell using TEABF₄/PC also showed high capacitance, high coulombic efficiency and good cycle stability. The optimized cell with TEABF₄/PC electrolyte had over 100 Wh kg⁻¹ of energy density for the cycling in 0.0–3.5 V range.

収録刊行物

• Electrochemistry

  Electrochemistry 80 (6), 415-420, 2012

  公益社団法人　電気化学会

キーワード

• Electric Double-Layer Capacitor
• Alkali-Treated Soft Carbon
• Asymmetric Cell
• Electrochemical Activation

詳細情報

• CRID: 1390282681473682048
• NII論文ID: 10030319820
• NII書誌ID: AN00151637
• DOI: 10.5796/electrochemistry.80.415
• COI: 1:CAS:528:DC%2BC38XovF2murk%3D
• ISSN: 21862451
• ISSN: 13443542
• NDL書誌ID: 023679010
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I023679010
• Web Site: https://www.jstage.jst.go.jp/article/electrochemistry/80/6/80_11-12-E2566/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用可