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 journalArticlepeer-review

    7 Scopus citations

    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 (US)
    Pages (from-to)71699-71703
    Number of pages5
    JournalRSC Advances
    Volume5
    Issue number88
    DOIs
    StatePublished - Aug 18 2015

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Chemical Engineering(all)

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