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

作者：Zhou Hong-ming; Sun Wen-jiao; Li Jian^*

来源：Journal of Central South University (English Edition), 2015, 22(7): 2435-2439.

DOI：10.1007/s11771-015-2770-9

• spiro-type quaternary ammonium salt
• synthesis
• electrolyte
• electric double-layer capacitor

A spiro-type quaternary ammonium salt, spiro-(1,1')-bipyrrolidinium tetrafluoroborate (SBP-BF4) 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 HBF4 in the system of ethanol solution. H-1 NMR, C-13 NMR, FI-IR and XPS analyses showed the structure of SBP-BF4. The as-obtained SBP-BF4 was dissolved in AN and used as the electrolyte for supercapacitor. Electrochemical measurements demonstrate that, compared with commercial electrolyte TEMA-BF4/AN, SBP-BF4/AN exhibits high ionic conductivity, lower resistance and improved cycling performance, which is due to its smaller ion size and stable symmetry structure.

• 出版日期2015-7
• 单位中南大学