BROWSE

Related Scientist

Researcher

분자 분광학 및 동력학 연구단
분자 분광학 및 동력학 연구단
more info

Bis(oxalate)borate-containing electrolytes for high voltage electric double-layer capacitors: A comparative study

Cited 0 time in webofscience Cited 0 time in scopus
25 Viewed 4 Downloaded
Title
Bis(oxalate)borate-containing electrolytes for high voltage electric double-layer capacitors: A comparative study
Author(s)
Nguyen, Hoai Van; Lee, Sanghee; Kyungwon Kwak; Lee, Kyung-Koo
Publication Date
2019-10
Journal
ELECTROCHIMICA ACTA, v.321, no., pp.134649 -
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
This study reports a systematic investigation of electrolytes based on new salts consisting of various cations and the bis(oxalate)borate (BOB) anion for use in electrical double layer capacitors. The quaternary ammonium salts—tetraethylammonium tetrafluoroborate (TEABF4), spiro-(1,1ʹ)-bipyrrolidinium tetrafluoroborate (SBPBF4), 1,1-dimethylpyrrolidinium tetrafluoroborate (DMPBF4), tetraethylammonium bis(oxalato)borate (TEABOB), spiro-(1,1ʹ)-bipyrrolidinium bis(oxalato)borate (SBPBOB), and 1,1-dimethylpyrrolidinium bis(oxalato)borate (DMPBOB)—were successfully prepared in high purity and dissolved in acetonitrile (ACN) at a concentration of 1.0 M. The successful synthesis of the salts was confirmed by nuclear magnetic resonance, ultraviolet–visible, and Fourier-transform infrared spectroscopies. The physicochemical properties and electrochemical performance of the prepared electrolytes, namely, thermal stability, ionic conductivity, viscosity, electrochemical stability window, specific capacitance, and durability, were investigated. Compared to the BF4-containing electrolytes, the new electrolytes based on the BOB anion, particularly the DMPBOB salt, showed dramatically enhanced high-voltage performance at elevated temperature. Electrical double layer capacitors based on 1 M DMPBOB in ACN exhibited a capacitance retention of 55.9% and a coulombic efficiency of >99% after 2000 cycles at a working voltage of 4.0 V and 45 °C. Moreover, X-ray photoelectron spectroscopy suggested that a highly stable protective layer induced by the BOB-containing electrolyte was formed on the negative electrode of the capacitor, inhibiting acute electrolyte decomposition during the cycling test. © 2019 Published by Elsevier Ltd.
URI
https://pr.ibs.re.kr/handle/8788114/6823
ISSN
0013-4686
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > Journal Papers (저널논문)
Files in This Item:
Bis(oxalate)borate-containing electrolytes for high voltage_(곽경원).pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse