Journal of Electrochemical Science and Technology

  • 제8권4호
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  • Pages.314-322
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  • 2017
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  • 2093-8551(pISSN)
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  • 2288-9221(eISSN)
한국전기화학회 (The Korean Electrochemical Society)
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Lithium Bis(oxalate)borate as an Electrolyte Salt for Supercapacitors in Elevated Temperature Applications

  • Madzvamuse, Alfred (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Hamenu, Louis (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Mohammed, Latifatu (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Bon, Chris Yeajoon (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Kim, Sang Jun (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Park, Jeong Ho (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Ko, Jang Myoun (Department of Chemical and Biological Engineering, Hanbat National University)
  • 투고 : 2017.07.20
  • 심사 : 2017.11.08
  • 발행 : 2017.12.31
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초록

The electrolyte plays one of the most significant roles in the performance of electrochemical supercapacitors. Most liquid organic electrolytes used commercially have temperature and potential range constraints, which limit the possible energy and power output of the supercapacitor. The effect of elevated temperature on a lithium bis(oxalate)borate(LiBOB) salt-based electrolyte was evaluated in a symmetric supercapacitor assembled with activated carbon electrodes and different electrolyte blends of acetonitrile(ACN) and propylene carbonate(PC). The electrochemical properties were investigated using linear sweep voltammetry, cyclic voltammetry, galvanostatic charge-discharge cycles, and electrochemical impedance spectroscopy. In particular, it was shown that LiBOB is stable at an operational temperature of $80^{\circ}C$, and that, blending the solvents helps to improve the overall performance of the supercapacitor. The cells retained about 81% of the initial specific capacitance after 1000 galvanic cycles in the potential range of 0-2.5 V. Thus, LiBOB/ACN:PC electrolytes exhibit a promising role in supercapacitor applications under elevated temperature conditions.

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