Influence of Counterion Structure on Conductivity of Polymerized Ionic Liquids

Jordan R. Keith; Nathan J. Rebello; Benjamin J. Cowen; Venkat Ganesan

doi:10.1021/acsmacrolett.9b00070

Influence of Counterion Structure on Conductivity of Polymerized Ionic Liquids

Jordan R. Keith, Nathan J. Rebello, Benjamin J. Cowen, Venkat Ganesan

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

57 Scopus citations

Abstract

We performed long-time all-atom molecular dynamics simulations of cationic polymerized ionic liquids with eight mobile counterions, systematically varying size and shape to probe their influence on the decoupling of conductivity from polymer segmental dynamics. We demonstrated rigorous identification of the dilatometric glass-transition temperature (T g ) for polymerized ionic liquids using an all-atom force field. Polymer segmental relaxation rates are presumed to be consistent for different materials at the same glass-transition-normalized temperature (T g /T), allowing us to extract a relative order of decoupling by examining conductivity at the same T g /T. Size, or ionic volume, cannot fully explain decoupling trends, but within certain geometric and chemical-specific classes, small ions generally show a higher degree of decoupling. This size effect is not universal and appears to be overcome when structural results reveal substantial coordination delocalization. We also reveal a universal inverse correlation between ion-association structural relaxation time and absolute conductivity for these polymerized ionic liquids, supporting the ion-hopping interpretation of ion mobility in polymerized ionic liquids.

Original language	English (US)
Pages (from-to)	387-392
Number of pages	6
Journal	ACS Macro Letters
Volume	8
Issue number	4
DOIs	https://doi.org/10.1021/acsmacrolett.9b00070
State	Published - Mar 25 2019
Externally published	Yes

Bibliographical note

KAUST Repository Item: Exported on 2021-03-12
Acknowledged KAUST grant number(s): OSR-2016-CRG5-2993-1
Acknowledgements: We acknowledge funding in part by grants from the Robert A. Welch Foundation (Grant F1599), the National Science Foundation (CBET-17069698 and DMR-1721512), and King Abdullah University of Science and Technology (OSR-2016-CRG5-2993-1). Acknowledgment is also made to the Donors of the American Chemical Society Petroleum Research Fund for partial support of this research (56715-ND9). This research made use of the resources of the Texas Advanced Computing Center (TACC) and the High Performance Computing Center at Idaho National Laboratory which is supported by the Office of Nuclear Energy of the U.S. Department of Energy and the Nuclear Science User Facilities under Contract No. DE-AC07-05ID14517. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. DOEâ€™s National Nuclear Security Administration under Contract DE-NA-0003525. The views expressed in the article do not necessarily represent the views of the U.S. DOE or the United States Government.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

Inorganic Chemistry
Organic Chemistry
Materials Chemistry
Polymers and Plastics

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10.1021/acsmacrolett.9b00070

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title = "Influence of Counterion Structure on Conductivity of Polymerized Ionic Liquids",

abstract = "We performed long-time all-atom molecular dynamics simulations of cationic polymerized ionic liquids with eight mobile counterions, systematically varying size and shape to probe their influence on the decoupling of conductivity from polymer segmental dynamics. We demonstrated rigorous identification of the dilatometric glass-transition temperature (T g ) for polymerized ionic liquids using an all-atom force field. Polymer segmental relaxation rates are presumed to be consistent for different materials at the same glass-transition-normalized temperature (T g /T), allowing us to extract a relative order of decoupling by examining conductivity at the same T g /T. Size, or ionic volume, cannot fully explain decoupling trends, but within certain geometric and chemical-specific classes, small ions generally show a higher degree of decoupling. This size effect is not universal and appears to be overcome when structural results reveal substantial coordination delocalization. We also reveal a universal inverse correlation between ion-association structural relaxation time and absolute conductivity for these polymerized ionic liquids, supporting the ion-hopping interpretation of ion mobility in polymerized ionic liquids.",

author = "Keith, {Jordan R.} and Rebello, {Nathan J.} and Cowen, {Benjamin J.} and Venkat Ganesan",

note = "KAUST Repository Item: Exported on 2021-03-12 Acknowledged KAUST grant number(s): OSR-2016-CRG5-2993-1 Acknowledgements: We acknowledge funding in part by grants from the Robert A. Welch Foundation (Grant F1599), the National Science Foundation (CBET-17069698 and DMR-1721512), and King Abdullah University of Science and Technology (OSR-2016-CRG5-2993-1). Acknowledgment is also made to the Donors of the American Chemical Society Petroleum Research Fund for partial support of this research (56715-ND9). This research made use of the resources of the Texas Advanced Computing Center (TACC) and the High Performance Computing Center at Idaho National Laboratory which is supported by the Office of Nuclear Energy of the U.S. Department of Energy and the Nuclear Science User Facilities under Contract No. DE-AC07-05ID14517. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. DOE{\^a}€{\texttrademark}s National Nuclear Security Administration under Contract DE-NA-0003525. The views expressed in the article do not necessarily represent the views of the U.S. DOE or the United States Government. This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

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doi = "10.1021/acsmacrolett.9b00070",

language = "English (US)",

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AU - Keith, Jordan R.

AU - Rebello, Nathan J.

AU - Cowen, Benjamin J.

AU - Ganesan, Venkat

N1 - KAUST Repository Item: Exported on 2021-03-12 Acknowledged KAUST grant number(s): OSR-2016-CRG5-2993-1 Acknowledgements: We acknowledge funding in part by grants from the Robert A. Welch Foundation (Grant F1599), the National Science Foundation (CBET-17069698 and DMR-1721512), and King Abdullah University of Science and Technology (OSR-2016-CRG5-2993-1). Acknowledgment is also made to the Donors of the American Chemical Society Petroleum Research Fund for partial support of this research (56715-ND9). This research made use of the resources of the Texas Advanced Computing Center (TACC) and the High Performance Computing Center at Idaho National Laboratory which is supported by the Office of Nuclear Energy of the U.S. Department of Energy and the Nuclear Science User Facilities under Contract No. DE-AC07-05ID14517. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. DOEâ€™s National Nuclear Security Administration under Contract DE-NA-0003525. The views expressed in the article do not necessarily represent the views of the U.S. DOE or the United States Government. This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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N2 - We performed long-time all-atom molecular dynamics simulations of cationic polymerized ionic liquids with eight mobile counterions, systematically varying size and shape to probe their influence on the decoupling of conductivity from polymer segmental dynamics. We demonstrated rigorous identification of the dilatometric glass-transition temperature (T g ) for polymerized ionic liquids using an all-atom force field. Polymer segmental relaxation rates are presumed to be consistent for different materials at the same glass-transition-normalized temperature (T g /T), allowing us to extract a relative order of decoupling by examining conductivity at the same T g /T. Size, or ionic volume, cannot fully explain decoupling trends, but within certain geometric and chemical-specific classes, small ions generally show a higher degree of decoupling. This size effect is not universal and appears to be overcome when structural results reveal substantial coordination delocalization. We also reveal a universal inverse correlation between ion-association structural relaxation time and absolute conductivity for these polymerized ionic liquids, supporting the ion-hopping interpretation of ion mobility in polymerized ionic liquids.

AB - We performed long-time all-atom molecular dynamics simulations of cationic polymerized ionic liquids with eight mobile counterions, systematically varying size and shape to probe their influence on the decoupling of conductivity from polymer segmental dynamics. We demonstrated rigorous identification of the dilatometric glass-transition temperature (T g ) for polymerized ionic liquids using an all-atom force field. Polymer segmental relaxation rates are presumed to be consistent for different materials at the same glass-transition-normalized temperature (T g /T), allowing us to extract a relative order of decoupling by examining conductivity at the same T g /T. Size, or ionic volume, cannot fully explain decoupling trends, but within certain geometric and chemical-specific classes, small ions generally show a higher degree of decoupling. This size effect is not universal and appears to be overcome when structural results reveal substantial coordination delocalization. We also reveal a universal inverse correlation between ion-association structural relaxation time and absolute conductivity for these polymerized ionic liquids, supporting the ion-hopping interpretation of ion mobility in polymerized ionic liquids.

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UR - https://pubs.acs.org/doi/10.1021/acsmacrolett.9b00070

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U2 - 10.1021/acsmacrolett.9b00070

DO - 10.1021/acsmacrolett.9b00070

M3 - Article

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SP - 387

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JO - ACS Macro Letters

JF - ACS Macro Letters

IS - 4

ER -

Influence of Counterion Structure on Conductivity of Polymerized Ionic Liquids

Abstract

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