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    Model-based Design of Stable Electrolytes for Potassium Ion Batteries

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    Model_Model based.pdf
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    Description:
    Accepted Article
    Embargo End Date:
    2021-09-04
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    Type
    Article
    Authors
    Zhang, Jiao
    Cao, Zhen
    Zhou, Lin
    Park, Geon-Tae
    Cavallo, Luigi cc
    Wang, Limin
    Alshareef, Husam N. cc
    Sun, Yang-Kook
    Ming, Jun
    KAUST Department
    Chemical Science Program
    Functional Nanomaterials and Devices Research Group
    KAUST Catalysis Center (KCC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-09-04
    Online Publication Date
    2020-09-04
    Print Publication Date
    2020-10-09
    Embargo End Date
    2021-09-04
    Permanent link to this record
    http://hdl.handle.net/10754/665082
    
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    Abstract
    Rechargeable potassium (ion) batteries (KIBs) are an emerging energy storage system with many potential advantages over existing battery systems (e.g., Li-ion, Na-ion battery). However, the electrolyte design for KIBs remains challenging because of serious electrolyte decomposition. Particularly, this problem is aggravated when using metal potassium anodes. Herein, we report that the cation-solvent (i.e., K+-solvent) solvation structure which is determined by the electrolyte composition plays a dominant role in the failure of KIBs. We present an analysis of the reaction pathway to understand the behavior of the cation-solvent structure at the surface of metal electrodes (e.g., metal plating or M+-solvent decomposition). The electronegativity change of cation-solvent structure was studied and correlated to the stability of the electrolytes. We find that the electrolyte decomposition can be induced when the K+ -solvent structure accepts one electron from the electrode; however, this process can be suppressed by tuning the electronegativity through varying the solvent chemistry, anions type, and salt concentrations. Our results explain the high stability of existing high-concentration electrolytes, and present a general guideline to design stable electrolytes for KIBs. This approach can pave the way for the realization of high-performance K-ion batteries.
    Citation
    Zhang, J., Cao, Z., Zhou, L., Park, G.-T., Cavallo, L., Wang, L., … Ming, J. (2020). Model-based Design of Stable Electrolytes for Potassium Ion Batteries. ACS Energy Letters. doi:10.1021/acsenergylett.0c01634
    Sponsors
    This work is supported by the National Natural Science Foundation of China (21978281, 21975250) and National Key R&D Program of China (2017YFE0198100). The authors also thank the Independent Research Project of the State Key Laboratory of Rare Earth Resources Utilization (110005R086), Changchun Institute of Applied Chemistry, Chinese Academy of Sciences. The research reported in this publication was partially supported by King Abdullah University of Science and Technology (KAUST) and Hanyang University. The calculations were performed on the KAUST supercomputers.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Energy Letters
    DOI
    10.1021/acsenergylett.0c01634
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsenergylett.0c01634
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsenergylett.0c01634
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Catalysis Center (KCC)

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