Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Organic Electrolyte of the Additive the Gamma-Butyroloctone (GBL) for Additive Material Application to High Voltage Electrochemical Capacitor

Gamma-butyroloctone(GBL)을 첨가한 유기계 전해액의 고전압용 전기화학 커패시터로의 응용

  • Received : 2016.10.19
  • Accepted : 2017.01.08
  • Published : 2017.02.28
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Abstract

In this study, we studied the organic electrolyte application to electrochemical capacitor for high operation voltage. For high operating voltage, 5 wt % of gamma butyroloctone (GBL) was added in the bare electrolyte. During the cycle performance, stable SEI layers were formed by reductive decomposition of additive GBL. As a result, columbic efficient of 1M $SBPBF_4$ in EC:DMC(1:1) with GBL composite was enhanced to 70% after the 2000th cycle at voltage range 0-3.5 V. Additionally, SEI layer protected the surface of electrode and prevent the side-reaction between electrolyte to electrode.

본 연구에서는 고전압용 전기화학 커패시터에 응용을 위한 유기 전해액 개발에 관한 연구를 실시하였다. 사용한 기준 전해액으로는 1M의 $SBPBF_4$염이 포함된 EC:DMC(1:1) 복합 전해액을 사용하였으며, 고전압 안정성을 위해 기준 전해액에 첨가제 GBL을 5 wt.% 첨가했다. 0-3.5 V 전압 범위에서 초기 250 사이클까지의 효율이 약 2.5배 향상된 것을 확인할 수 있었으며, 2000 사이클 이후에는 약 3배 이상의 커패시턴스 효율이 유지되는 것을 확인하였다. 고전압에서 GBL이 전해액 보다 먼저 분해를 일으켜 전해액이 분해되는 현상을 억제하며 안정성을 향상시키는 효과가 있는 것으로 판단된다. 또한 분해된 GBL이 전극 표면에 흡착하여 안정한 SEI 층을 형성해줌으로서, 전극 표면을 보호하여 전해질과의 부반응을 억제해주는 역할을 하는 것으로 판단된다.

Keywords

References

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