High-voltage ionic liquid electrolytes based on ether functionalized pyrrolidinium for electric double-layer capacitors

Jin Hong Lee; Jung Bok Ryu; Albert S. Lee; Wonjun Na; Hyo Sang Yoon; Wan Joo Kim; Chong Min Koo

doi:10.1016/j.electacta.2016.11.176

High-voltage ionic liquid electrolytes based on ether functionalized pyrrolidinium for electric double-layer capacitors

Jin Hong Lee, Jung Bok Ryu, Albert S. Lee, Wonjun Na, Hyo Sang Yoon, Wan Joo Kim, Chong Min Koo

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

A series of ionic liquids containing imidazolium, pyrrolidinium, or ether-functionalized pyrrolidinium cations incorporated with the same counter anion of bis(fluorosulfonyl)imide (FSI⁻) were synthesized to investigate the effects of the cation structures on the physical and electrochemical properties of ionic liquids. The introduction of the polar ether group was able to compensate for the loss of the mobility of pyrrolidinium cation-based ionic liquids, while maintaining the high thermal and electrochemical stability. Extensive examinations of these ionic liquids in electric double-layer capacitor (EDLC) cells were performed to investigate their voltage stability under various operating conditions. Electrochemical evaluation revealed that the cell fabricated with ether-functionalized pyrrolidinium ionic liquid could deliver larger capacitance values and stable cycling performance compared with the cell containing imidazolium-based ionic liquid at high operating voltage; demonstrating its possible applications as high voltage electrolytes for EDLCs.

Original language	English
Pages (from-to)	1847-1852
Number of pages	6
Journal	Electrochimica Acta
Volume	222
DOIs	https://doi.org/10.1016/j.electacta.2016.11.176
Publication status	Published - 2016 Dec 20
Externally published	Yes

Keywords

Electrical double-layer capacitor
High operating voltage
Ionic liquid

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry

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title = "High-voltage ionic liquid electrolytes based on ether functionalized pyrrolidinium for electric double-layer capacitors",

abstract = "A series of ionic liquids containing imidazolium, pyrrolidinium, or ether-functionalized pyrrolidinium cations incorporated with the same counter anion of bis(fluorosulfonyl)imide (FSI−) were synthesized to investigate the effects of the cation structures on the physical and electrochemical properties of ionic liquids. The introduction of the polar ether group was able to compensate for the loss of the mobility of pyrrolidinium cation-based ionic liquids, while maintaining the high thermal and electrochemical stability. Extensive examinations of these ionic liquids in electric double-layer capacitor (EDLC) cells were performed to investigate their voltage stability under various operating conditions. Electrochemical evaluation revealed that the cell fabricated with ether-functionalized pyrrolidinium ionic liquid could deliver larger capacitance values and stable cycling performance compared with the cell containing imidazolium-based ionic liquid at high operating voltage; demonstrating its possible applications as high voltage electrolytes for EDLCs.",

keywords = "Electrical double-layer capacitor, High operating voltage, Ionic liquid",

author = "Lee, {Jin Hong} and Ryu, {Jung Bok} and Lee, {Albert S.} and Wonjun Na and Yoon, {Hyo Sang} and Kim, {Wan Joo} and Koo, {Chong Min}",

note = "Funding Information: This work was financially supported by grants from the Fundamental R&D Program for Core Technology of Materials and Industrial Strategic Technology Development Program funded by the Ministry of Knowledge Economy, Republic of Korea. Partial funding was given by the Materials Architecturing Research Center of Korea Institute of Science and Technology (KIST) and the Korea Research Fellowship Program funded by the Ministry of Science, ICT, and Future Planning through the National Research Foundation of Korea. We would also like to give special thanks to In-hyuk Lee for valuable and sincere discussions about the experimental methods and data.",

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doi = "10.1016/j.electacta.2016.11.176",

language = "English",

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AU - Lee, Jin Hong

AU - Ryu, Jung Bok

AU - Lee, Albert S.

AU - Na, Wonjun

AU - Yoon, Hyo Sang

AU - Kim, Wan Joo

AU - Koo, Chong Min

N1 - Funding Information: This work was financially supported by grants from the Fundamental R&D Program for Core Technology of Materials and Industrial Strategic Technology Development Program funded by the Ministry of Knowledge Economy, Republic of Korea. Partial funding was given by the Materials Architecturing Research Center of Korea Institute of Science and Technology (KIST) and the Korea Research Fellowship Program funded by the Ministry of Science, ICT, and Future Planning through the National Research Foundation of Korea. We would also like to give special thanks to In-hyuk Lee for valuable and sincere discussions about the experimental methods and data.

PY - 2016/12/20

Y1 - 2016/12/20

N2 - A series of ionic liquids containing imidazolium, pyrrolidinium, or ether-functionalized pyrrolidinium cations incorporated with the same counter anion of bis(fluorosulfonyl)imide (FSI−) were synthesized to investigate the effects of the cation structures on the physical and electrochemical properties of ionic liquids. The introduction of the polar ether group was able to compensate for the loss of the mobility of pyrrolidinium cation-based ionic liquids, while maintaining the high thermal and electrochemical stability. Extensive examinations of these ionic liquids in electric double-layer capacitor (EDLC) cells were performed to investigate their voltage stability under various operating conditions. Electrochemical evaluation revealed that the cell fabricated with ether-functionalized pyrrolidinium ionic liquid could deliver larger capacitance values and stable cycling performance compared with the cell containing imidazolium-based ionic liquid at high operating voltage; demonstrating its possible applications as high voltage electrolytes for EDLCs.

AB - A series of ionic liquids containing imidazolium, pyrrolidinium, or ether-functionalized pyrrolidinium cations incorporated with the same counter anion of bis(fluorosulfonyl)imide (FSI−) were synthesized to investigate the effects of the cation structures on the physical and electrochemical properties of ionic liquids. The introduction of the polar ether group was able to compensate for the loss of the mobility of pyrrolidinium cation-based ionic liquids, while maintaining the high thermal and electrochemical stability. Extensive examinations of these ionic liquids in electric double-layer capacitor (EDLC) cells were performed to investigate their voltage stability under various operating conditions. Electrochemical evaluation revealed that the cell fabricated with ether-functionalized pyrrolidinium ionic liquid could deliver larger capacitance values and stable cycling performance compared with the cell containing imidazolium-based ionic liquid at high operating voltage; demonstrating its possible applications as high voltage electrolytes for EDLCs.

KW - Electrical double-layer capacitor

KW - High operating voltage

KW - Ionic liquid

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High-voltage ionic liquid electrolytes based on ether functionalized pyrrolidinium for electric double-layer capacitors

Abstract

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