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    Coordination Polymer Modified Separator for Mitigating Polysulfide Shuttle Effect in Lithium-Sulfur Batteries

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    Name:
    Yi Wan - Thesis - Final Draft.pdf
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    Type
    Thesis
    Authors
    Wan, Yi cc
    Advisors
    Li, Lain-Jong cc
    Committee members
    Zhang, Xixiang cc
    Huang, Kuo-Wei cc
    Program
    Material Science and Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2017-11-19
    Embargo End Date
    2018-12-10
    Permanent link to this record
    http://hdl.handle.net/10754/626342
    
    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 became available to the public after the expiration of the embargo on 2018-12-10.
    Abstract
    The development of the new cathode and anode materials of Lithium-Ion Batteries (LIBs) with high energy density and outstanding electrochemical performance is of substantial technological importance due to the ever-increasing demand for economic and efficient energy storage system. Because of the abundance of element sulfur and high theoretical energy density, Lithium-Sulfur (Li-S) batteries have become one of the most promising candidates for the next-generation energy storage system. However, the shuttling effect of electrolyte-soluble polysulfides severely impedes the cell performance and commercialization of Li-S batteries, and significant progress have been made to mitigate this shuttle effect in the past two decades. Coordination polymers (CPs) or Metal-organic Frameworks (MOFs) have been attracted much attention by virtue of their controllable porosity, nanometer cavity sizes and high surface areas, which supposed to be an available material in suppressing polysulfide migration. In this thesis, we investigate different mechanisms of mitigating polysulfide diffusion by applying a layer of MOFs (including Y-FTZB, ZIF-7, ZIF-8, and HKUST-1) on a separator. We also fabricate a new free-standing 2D coordination polymer Zn2(Benzimidazolate)2(OH)2 with rich hydroxyl (OH-) groups by using a simple, scalable and low cost method at air/water surface. Our results suggest that the chemical stability, the cluster morphology and the surface function groups of MOFs shows a greater impact on minimizing the shuttling effect in Li-S batteries, other than the internal cavity size in MOFs. Meanwhile, the new design of 2D coordination polymer efficiently mitigate the shuttling effect in Li-S battery resulting in a largely promotion of the battery capacity to 1407 mAh g-1 at 0.1 C and excellent cycling performance (capacity retention of 98% after 200 cycles at 0.25C). Such excellent cell performance is mainly owing to the fancying physical and chemical structure controllability of MOFs or CPs, which has substantial potential for future commercial utilizations.
    Citation
    Wan, Y. (2017). Coordination Polymer Modified Separator for Mitigating Polysulfide Shuttle Effect in Lithium-Sulfur Batteries. KAUST Research Repository. https://doi.org/10.25781/KAUST-W1U24
    DOI
    10.25781/KAUST-W1U24
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-W1U24
    Scopus Count
    Collections
    Theses; Theses; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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