The smallest quaternary ammonium salts with ether groups for high-performance electrochemical double layer capacitors

Taihee Han, Min Sik Park, Jeonghun Kim, Jung Ho Kim, Ketack Kim

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Electrochemical double layer capacitors (EDLCs) are energy storage devices that have been used for a wide range of electronic applications. In particular, the electrolyte is one of the important components, directly related to the capacitance and stability. Herein, we first report a series of the smallest quaternary ammonium salts (QASs), with ether groups on tails and tetrafluoroborate (BF4) as an anion, for use in EDLCs. To find the optimal structure, various QASs with different sized head groups and ether-containing tail groups were systematically compared. Comparing two nearly identical structures with and without ether groups, QASs with oxygen atoms showed improved capacitance, proving that ions with oxygen atoms move more easily than their counterparts at lower electric fields. Moreover, the ether containing QASs showed low activation energy values of conductivities, leading to smaller IR drops during the charge and discharge processes, resulting in an overall higher capacitance.

Original languageEnglish
Pages (from-to)1791-1796
Number of pages6
JournalChemical Science
Volume7
Issue number3
DOIs
Publication statusPublished - 2016 Mar 1

Bibliographical note

Funding Information:
This research was supported by a 2014 Research Grant from Sangmyung University.

Publisher Copyright:
© The Royal Society of Chemistry 2016.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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