Preparation of spiro-type quaternary ammonium salt via economical and efficient synthetic route as electrolyte for electric double-layer capacitor

A spiro-type quaternary ammonium salt, spiro-(1,1′)-bipyrrolidinium tetrafluoroborate (SBP-BF 4 ) was successfully prepared by an economical and efficient three-step process comprising the cyclization reaction of 1,4-dibromobutane and pyrrolidine, and subsequent ion exchange pathway with KOH followe...

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Bibliographic Details
Published inJournal of Central South University Vol. 22; no. 7; pp. 2435 - 2439
Main Authors Zhou, Hong-ming, Sun, Wen-jiao, Li, Jian
Format Journal Article
LanguageEnglish
Published Changsha Central South University 01.07.2015
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Summary:A spiro-type quaternary ammonium salt, spiro-(1,1′)-bipyrrolidinium tetrafluoroborate (SBP-BF 4 ) was successfully prepared by an economical and efficient three-step process comprising the cyclization reaction of 1,4-dibromobutane and pyrrolidine, and subsequent ion exchange pathway with KOH followed by neutralization reaction via HBF 4 in the system of ethanol solution. 1 H NMR, 13 C NMR, FI-IR and XPS analyses showed the structure of SBP-BF 4 . The as-obtained SBP-BF 4 was dissolved in AN and used as the electrolyte for supercapacitor. Electrochemical measurements demonstrate that, compared with commercial electrolyte TEMA-BF 4 /AN, SBP-BF 4 /AN exhibits high ionic conductivity, lower resistance and improved cycling performance, which is due to its smaller ion size and stable symmetry structure.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-015-2770-9