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  • Ion Dynamics of Water-in-Salt Electrolyte with Organic Solvents in Nanoporous Supercapacitor Electrodes

    Author(s)
    Li, Changwen
    Bo, Zheng
    Yang, Huachao
    Yang, Jinyuan
    Kong, Jing
    Wu, Shenghao
    Yan, Jianhua
    Cen, Kefa
    Ostrikov, Kostya Ken
    Griffith University Author(s)
    Ostrikov, Ken
    Year published
    2020
    Metadata
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    Abstract
    Water-in-salt electrolytes blended with organics solvents, that is, organic solvent/water mixed electrolytes, are promising for applications in next-generation energy storage devices vitally needed for industrial electrification and decarbonization. However, the electrolyte ion diffusion behaviors within nanoporous supercapacitor electrodes are poorly understood. Here a systematic investigation into supercapacitor resistances and ion kinetics is carried out experimentally and with numerical simulations. The electrochemical results on the nanoporous electrodes reveal a nonmonotonic (decreasing, increasing, and then decreasing) ...
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    Water-in-salt electrolytes blended with organics solvents, that is, organic solvent/water mixed electrolytes, are promising for applications in next-generation energy storage devices vitally needed for industrial electrification and decarbonization. However, the electrolyte ion diffusion behaviors within nanoporous supercapacitor electrodes are poorly understood. Here a systematic investigation into supercapacitor resistances and ion kinetics is carried out experimentally and with numerical simulations. The electrochemical results on the nanoporous electrodes reveal a nonmonotonic (decreasing, increasing, and then decreasing) trend of supercapacitor resistances with increasing solvent mobility, challenging the long-held views that supercapacitor resistances decrease with elevated mobility of organic solvent. The abnormal trend is examined by numerical molecular dynamics simulations of electrolyte ion diffusion within 0.95 nm nanochannels. The electrolyte conductivity is related to cation–anion interactions within nanochannels. We further confirm the crucial interplay of the van der Waals sizes of solvent molecules and channel width in determining electrolyte conductivity in nanoporous electrodes.
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    Journal Title
    ChemElectroChem
    DOI
    https://doi.org/10.1002/celc.202000101
    Note
    This publication was entered as an advance online version.
    Subject
    Analytical chemistry
    Physical chemistry
    Other chemical sciences
    Publication URI
    http://hdl.handle.net/10072/393476
    Collection
    • Journal articles

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