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    Spectro-Electrochemical Study of Staging in Graphitic Electrodes for Aluminum Batteries

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    Name:
    Shianlin Wee - Thesis - Final Draft.pdf
    Size:
    2.944Mb
    Format:
    PDF
    Description:
    Shianlin Wee - Thesis - Final Draft
    Embargo End Date:
    2021-11-14
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    Type
    Thesis
    Authors
    Wee, Shianlin cc
    Advisors
    Da Costa, Pedro M. F. J. cc
    Committee members
    Tung, Vincent cc
    Ooi, Boon S. cc
    Program
    Material Science and Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2019-11-14
    Embargo End Date
    2021-11-14
    Permanent link to this record
    http://hdl.handle.net/10754/660189
    
    Metadata
    Show full item record
    Access Restrictions
    At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis will become available to the public after the expiration of the embargo on 2021-11-14.
    Abstract
    After three decades of commercialization, graphite remains the preferred active material for intercalation-type Li-ion battery anodes. Still, the characterization of staging continues to be elusive at the sub-micro- and nano-scales, the typical dimensions of graphite crystallites. Here, the intercalation of Al-based anions in graphitic materials was studied using X-ray powder diffraction (XRD) and Raman spectroscopy. While, in the first case, the analysis was done ex-situ and in mm3-samples, a more localized view was provided by the laser probe which could, furthermore, interrogate the electrochemical process in real-time (in-situ). To do this, an electrochemical cell for Raman studies was custom-made for Al batteries working with non-aqueous electrolytes. Two C materials were used: natural graphite (NG) and processed expandable graphite (EG). Owing to the smaller flake size, higher graphitization degree and larger crystallites of the NG, the Al/NG cells exhibited better performance than the Al/EG ones. Interestingly, discrepancies were observed in the stage numbers estimated from XRD and Raman. These were thought to arise from the, respectively, long- and short-range atomic order scales that are analyzed by those two techniques. To confirm this, in-situ Raman multi-point studies were performed. The results show the presence of domains with mixed stage graphite intercalation when the cells were fully charged, explaining the staging discrepancies.
    Citation
    Wee, S. (2019). Spectro-Electrochemical Study of Staging in Graphitic Electrodes for Aluminum Batteries. KAUST Research Repository. https://doi.org/10.25781/KAUST-S18AJ
    DOI
    10.25781/KAUST-S18AJ
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-S18AJ
    Scopus Count
    Collections
    Theses; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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