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    Charge-Storage Mechanism of Aluminum-Sulfur Batteries

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    Charge storage.pdf
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Smajic, Jasmin cc
    Wee, Shianlin
    Fernandes Simoes, Filipa R.
    Hedhili, Mohamed N. cc
    Wehbe, Nimer
    Abou-Hamad, Edy
    Da Costa, Pedro M. F. J. cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Material Science and Engineering
    King Abdullah University of Science and Technology.
    Surface Science
    Imaging and Characterization Core Lab
    NMR
    Date
    2020-11-23
    Permanent link to this record
    http://hdl.handle.net/10754/666617
    
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    Abstract
    The electrochemical performance of aluminum-sulfur batteries is beset by poor stability and sluggish charge-storage properties. To address these issues, carbon allotropes have been used as electrode fillers, but successful outcomes remain inexplicably elusive. Here, a composite of sulfur and small diameter single-walled carbon nanotubes is synthesized and used as a cathode for reversible aluminum-sulfur batteries. The assembled electrode delivers a high capacity of 1024 mAh/g and effectively reduces the cell polarization by 37%. Moreover, the use of small-diameter SWCNT helps in lowering the electrolyte-to-sulfur ratio down to 17 μg/ml, an important step toward lean electrolyte conditions. Despite that, the capacity fade of the Al-S battery cannot be fully reversed. As we show, the consequence of the interaction between the electrolyte and S is the buildup of insoluble and poorly conductive discharge products, which inhibit charge diffusion and progressively deactivate the electrode, ultimately causing capacity decay. Overall, this works clarifies the carbon–sulfur–electrolyte interactions and their role in the underlying charge-storage mechanism of Al-S batteries.
    Citation
    Smajic, J., Wee, S., Fernandes Simoes, F. R., Hedhili, M. N., Wehbe, N., Abou-Hamad, E., & Costa, P. M. F. J. (2020). Charge-Storage Mechanism of Aluminum-Sulfur Batteries. ECS Meeting Abstracts, MA2020-02(2), 232–232. doi:10.1149/ma2020-022232mtgabs
    Publisher
    The Electrochemical Society
    Journal
    ECS Meeting Abstracts
    DOI
    10.1149/ma2020-022232mtgabs
    Additional Links
    https://iopscience.iop.org/article/10.1149/MA2020-022232mtgabs
    ae974a485f413a2113503eed53cd6c53
    10.1149/ma2020-022232mtgabs
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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