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Effect of Vinyl Ethylene Carbonate on Electrochemical Characteristics for Activated Carbon/Li4Ti5O12 Capacitors

활성탄/리튬티탄산화물 커패시터의 전기화학적 특성에 미치는 비닐에틸렌카보네이트의 영향

  • Kwon, Yong-Kab (Center for Energy Convergence, Korea Institute of Science and Technology) ;
  • Choi, Ho-Suk (Center for Energy Convergence, Korea Institute of Science and Technology) ;
  • Lee, Joong-Kee (Center for Energy Convergence, Korea Institute of Science and Technology)
  • 권용갑 (한국과학기술원 에너지융합센터) ;
  • 최호석 (한국과학기술원 에너지융합센터) ;
  • 이중기 (한국과학기술원 에너지융합센터)
  • Received : 2012.08.14
  • Accepted : 2012.08.30
  • Published : 2012.08.31

Abstract

We employed the vinyl ethylene carbonate (VEC) as an electrolyte additive and investigated the effect of the electrolyte additive on the electrochemical performance in hybrid capacitor. The activated carbon was adopted as cathode material, and the $Li_4Ti_5O_{12}$ oxide was used as anode material. The electrolyte was prepared with the $LiPF_6$ salt in the mixed solvent of ethylene carbonate (EC), dimethyl carbonate (DMC), and ethyl methyl carbonate(EMC). We evaluated the electrochemical performance of the hybrid capacitor with increasing the amount of the VEC electrolyte additive, which is known as the remover of oxygen functional group and the stabilizer of the electrode by reducing the surface of electrode, and obtained the superior performance data especially at the addition of the VEC electrolyte additive of around 0.7 vol%. On the contrary, the addition of the VEC more than 0.7 vol% in the electrolyte leads to the degradation in electrochemical performance of hybrid capacitor, suggesting the increase of the side reaction from the excessive VEC additive. X-ray photoelectron spectroscopy (XPS) revealed that the addition of the VEC suppressed the formation of LiF component, which is known as the insulator, on the surface of electrode. The optimized addition of VEC exhibited the improved capacity retention around 82.7% whereas the bare capacitors without VEC additive showed the 43.2% of capacity retention after 2500 cycling test.

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