TY - JOUR
T1 - Propionitrile as a single organic solvent for high voltage electric double-layer capacitors
AU - Nguyen, Hoai Van T.
AU - Faheem, Abdullah Bin
AU - Kwak, Kyungwon
AU - Lee, Kyung Koo
N1 - Funding Information:
This research was supported by the mid- and long-term nuclear research and development program through the National Research Foundation of Korea ( NRF-2017M2A8A5014710 ) funded by the Korean Ministry of Science and ICT and the National Research Foundation of Korea (NRF) grant funded by the Korea government( MSIT ) ( NRF-2019R1A4A102980111 ).
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/7/1
Y1 - 2020/7/1
N2 - This study investigates the novel use of propionitrile (PN) as the single organic solvent for high-voltage carbon/carbon capacitors. Quaternary ammonium salts spiro-(1,1ʹ)-bipyrrolidinium tetrafluoroborate (SBPBF4) and 1,1-dimethylpyrrolidinium tetrafluoroborate (DMPBF4) dissolved in acetonitrile (AN) and propionitrile (PN) are compared. PN-based electrolytes exhibit a large and symmetric electrochemical stability, an exceptional anodic potential limit, good ionic conductivity, and low viscosity, allowing EDLCs to operate at 3.5 V even with a high current density (2.5 A g−1). Moreover, PN-based electrolytes can suppress the anodic dissolution of the Al current collector at a high potential. These advantages help in the realization of EDLCs with excellent cycling stabilities at high voltages. As a result, at 3.5 V, EDLCs with PN-based electrolytes exhibit the highest energy and power density of 49.3 Wh kg−1 and 22.9 kW kg−1, respectively. Therefore, the electrolyte systems reported here could be a promising electrolyte candidate to replace currently commercialized electrolytes for practical applications.
AB - This study investigates the novel use of propionitrile (PN) as the single organic solvent for high-voltage carbon/carbon capacitors. Quaternary ammonium salts spiro-(1,1ʹ)-bipyrrolidinium tetrafluoroborate (SBPBF4) and 1,1-dimethylpyrrolidinium tetrafluoroborate (DMPBF4) dissolved in acetonitrile (AN) and propionitrile (PN) are compared. PN-based electrolytes exhibit a large and symmetric electrochemical stability, an exceptional anodic potential limit, good ionic conductivity, and low viscosity, allowing EDLCs to operate at 3.5 V even with a high current density (2.5 A g−1). Moreover, PN-based electrolytes can suppress the anodic dissolution of the Al current collector at a high potential. These advantages help in the realization of EDLCs with excellent cycling stabilities at high voltages. As a result, at 3.5 V, EDLCs with PN-based electrolytes exhibit the highest energy and power density of 49.3 Wh kg−1 and 22.9 kW kg−1, respectively. Therefore, the electrolyte systems reported here could be a promising electrolyte candidate to replace currently commercialized electrolytes for practical applications.
KW - 1,1-Dimethylpyrrolidinium tetrafluoroborate
KW - Cycle stability
KW - Electric double-layer capacitor
KW - High-voltage
KW - Propionitrile
UR - http://www.scopus.com/inward/record.url?scp=85083848920&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2020.228134
DO - 10.1016/j.jpowsour.2020.228134
M3 - Article
AN - SCOPUS:85083848920
SN - 0378-7753
VL - 463
JO - Journal of Power Sources
JF - Journal of Power Sources
M1 - 228134
ER -
