Evaluation of short alkyl chain modified [DBU][TFSI] based ionic liquids as supercapacitor electrolytes

Olli Pitkänen; Nemanja Vucetic; Helene Cabaud; Eva Bozo; Topias Järvinen; Jyri Pekka Mikkola; Krisztian Kordas

doi:10.1016/j.electacta.2023.143659

Evaluation of short alkyl chain modified [DBU][TFSI] based ionic liquids as supercapacitor electrolytes

Olli Pitkänen^*, Nemanja Vucetic, Helene Cabaud, Eva Bozo, Topias Järvinen, Jyri Pekka Mikkola, Krisztian Kordas

^*Corresponding author for this work

Laboratory of Industrial Chemistry and Reaction Engineering

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

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Abstract

The need of new electrolytes with wide electrochemical window, good stability and conductivity has promoted novel ionic liquids (ILs) as new solutions for supercapacitors. In this work, four hydrophobic room temperature ionic liquids based on organic superbase-derived cations and Trifluoromethanesulfonimide (TFSI) anion were synthetized. The structures of the novel ILs were analyzed, characterized and their performance as a supercapacitor electrolyte was evaluated. The ILs have high decomposition temperatures of up to 490 °C and electrochemical window up to 4.8 V. It was found that there was an optimal chemical structure providing the best stability and operational potential window coupled with moderate conductivity. The IL with the shortest alkyl chain structure provided the highest conductivity but suffered from instability. The performance of the ILs with longer alkyl chains was hindered by lower conductivities and, in the case of the largest chemical structures, also by reduced cyclic stabilities in open air. However, the ionic liquid with moderate alkyl chain length was found to be stable even in open air providing decent conductivity, which can be utilized in future research to develop other hydrophobic ionic liquids suitable as supercapacitor electrolytes.

Original language	English
Article number	143659
Number of pages	6
Journal	Electrochimica Acta
Volume	475
DOIs	https://doi.org/10.1016/j.electacta.2023.143659
Publication status	Published - 20 Jan 2024
MoE publication type	A1 Journal article-refereed

Funding

The work was funded by Academy of Finland (project 325185 , Nigella) and was also performed as a part of activities of the European Regional Development Fund/Council of Oulu region (Project: “Towards green electronics: Biobased and sustainable applications for the microelectronics”) and the Johan Gadolin Process Chemistry Centre at Åbo Akademi University in Finland and Chemical-Biological Centre, Umeå University , Sweden. J.T. acknowledges Tauno Tönning and Walter Ahlström foundations for their financial support. The personnel of the Centre for Material Analysis (Univ. Oulu) for the technical assistance and the Swedish Bio4Energy programme is gratefully acknowledged.

Keywords

DBU
Electrolyte
Ionic liquids
Room temperature
Supercapacitors
TFSI

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10.1016/j.electacta.2023.143659

1-s2.0-S0013468623018273-mainFinal published version, 1.25 MBLicence: CC BY

https://urn.fi/URN:NBN:fi-fe202403019358

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title = "Evaluation of short alkyl chain modified [DBU][TFSI] based ionic liquids as supercapacitor electrolytes",

abstract = "The need of new electrolytes with wide electrochemical window, good stability and conductivity has promoted novel ionic liquids (ILs) as new solutions for supercapacitors. In this work, four hydrophobic room temperature ionic liquids based on organic superbase-derived cations and Trifluoromethanesulfonimide (TFSI) anion were synthetized. The structures of the novel ILs were analyzed, characterized and their performance as a supercapacitor electrolyte was evaluated. The ILs have high decomposition temperatures of up to 490 °C and electrochemical window up to 4.8 V. It was found that there was an optimal chemical structure providing the best stability and operational potential window coupled with moderate conductivity. The IL with the shortest alkyl chain structure provided the highest conductivity but suffered from instability. The performance of the ILs with longer alkyl chains was hindered by lower conductivities and, in the case of the largest chemical structures, also by reduced cyclic stabilities in open air. However, the ionic liquid with moderate alkyl chain length was found to be stable even in open air providing decent conductivity, which can be utilized in future research to develop other hydrophobic ionic liquids suitable as supercapacitor electrolytes.",

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AU - Pitkänen, Olli

AU - Vucetic, Nemanja

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AU - Bozo, Eva

AU - Järvinen, Topias

AU - Mikkola, Jyri Pekka

AU - Kordas, Krisztian

PY - 2024/1/20

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N2 - The need of new electrolytes with wide electrochemical window, good stability and conductivity has promoted novel ionic liquids (ILs) as new solutions for supercapacitors. In this work, four hydrophobic room temperature ionic liquids based on organic superbase-derived cations and Trifluoromethanesulfonimide (TFSI) anion were synthetized. The structures of the novel ILs were analyzed, characterized and their performance as a supercapacitor electrolyte was evaluated. The ILs have high decomposition temperatures of up to 490 °C and electrochemical window up to 4.8 V. It was found that there was an optimal chemical structure providing the best stability and operational potential window coupled with moderate conductivity. The IL with the shortest alkyl chain structure provided the highest conductivity but suffered from instability. The performance of the ILs with longer alkyl chains was hindered by lower conductivities and, in the case of the largest chemical structures, also by reduced cyclic stabilities in open air. However, the ionic liquid with moderate alkyl chain length was found to be stable even in open air providing decent conductivity, which can be utilized in future research to develop other hydrophobic ionic liquids suitable as supercapacitor electrolytes.

AB - The need of new electrolytes with wide electrochemical window, good stability and conductivity has promoted novel ionic liquids (ILs) as new solutions for supercapacitors. In this work, four hydrophobic room temperature ionic liquids based on organic superbase-derived cations and Trifluoromethanesulfonimide (TFSI) anion were synthetized. The structures of the novel ILs were analyzed, characterized and their performance as a supercapacitor electrolyte was evaluated. The ILs have high decomposition temperatures of up to 490 °C and electrochemical window up to 4.8 V. It was found that there was an optimal chemical structure providing the best stability and operational potential window coupled with moderate conductivity. The IL with the shortest alkyl chain structure provided the highest conductivity but suffered from instability. The performance of the ILs with longer alkyl chains was hindered by lower conductivities and, in the case of the largest chemical structures, also by reduced cyclic stabilities in open air. However, the ionic liquid with moderate alkyl chain length was found to be stable even in open air providing decent conductivity, which can be utilized in future research to develop other hydrophobic ionic liquids suitable as supercapacitor electrolytes.

KW - DBU

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KW - Room temperature

KW - Supercapacitors

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ER -

Evaluation of short alkyl chain modified [DBU][TFSI] based ionic liquids as supercapacitor electrolytes

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