High performance supercapacitor under extremely low environmental temperature

Yue Zhou, Mehdi Ghaffari, Minren Lin, Haiping Xu, Huaqing Xie, Chong Min Koo, Q. M. Zhang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Supercapacitors with a broad operational temperature range, especially with the capability of operating at low temperature (below -50°C), are required for applications in extreme environments. This paper presents a high performance supercapacitor, consisting of highly aligned nano-porous graphene (A-NPG) with an eutectic mixture of ionic liquids (ILs), 1-butyl-4-methylpyridinium tetrafluoroborate (BMPBF4) in 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF4), which exhibits a high capacitance performance over a temperature range from -50°C to 80°C. The experimental results reveal a reducing of melting temperature Tm of the eutectic mixture to -74°C, compared with -39°C of BMIBF4. The increased ionic conductivity and reduced Tm of the eutectic mixture, combined with ultrahigh density A-NPG electrodes, enable the supercapacitor to show a high capacitance of 125 F cm-3 at room temperature and 106 F cm-3 at -50°C. In contrast, the supercapacitor with pure BMIBF4 shows a capacitance of 119 F cm-3 and 16.5 F cm-3 at room temperature and -50°C, respectively.

Original languageEnglish
Pages (from-to)71699-71703
Number of pages5
JournalRSC Advances
Volume5
Issue number88
DOIs
Publication statusPublished - 2015 Aug 18
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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  • Cite this

    Zhou, Y., Ghaffari, M., Lin, M., Xu, H., Xie, H., Koo, C. M., & Zhang, Q. M. (2015). High performance supercapacitor under extremely low environmental temperature. RSC Advances, 5(88), 71699-71703. https://doi.org/10.1039/c5ra14016a