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    SnO2 anode surface passivation by atomic layer deposited HfO2 improves li-ion battery performance

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    Type
    Article
    Authors
    Yesibolati, Nulati
    Shahid, Muhammad
    Chen, Wei
    Hedhili, Mohamed N. cc
    Reuter, Mark C.
    Ross, Frances M.
    Alshareef, Husam N. cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Core Labs
    Functional Nanomaterials and Devices Research Group
    Imaging and Characterization Core Lab
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2014-03-14
    Online Publication Date
    2014-03-14
    Print Publication Date
    2014-07
    Permanent link to this record
    http://hdl.handle.net/10754/563442
    
    Metadata
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    Abstract
    For the first time, it is demonstrated that nanoscale HfO2 surface passivation layers formed by atomic layer deposition (ALD) significantly improve the performance of Li ion batteries with SnO2-based anodes. Specifically, the measured battery capacity at a current density of 150 mAg -1 after 100 cycles is 548 and 853 mAhg-1 for the uncoated and HfO2-coated anodes, respectively. Material analysis reveals that the HfO2 layers are amorphous in nature and conformably coat the SnO2-based anodes. In addition, the analysis reveals that ALD HfO2 not only protects the SnO2-based anodes from irreversible reactions with the electrolyte and buffers its volume change, but also chemically interacts with the SnO2 anodes to increase battery capacity, despite the fact that HfO2 is itself electrochemically inactive. The amorphous nature of HfO2 is an important factor in explaining its behavior, as it still allows sufficient Li diffusion for an efficient anode lithiation/delithiation process to occur, leading to higher battery capacity. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Sponsors
    The authors wish to thank R. B. Rakhi for her support. HNA and FMR acknowledge the support from the KAUST-IBM grant.
    Publisher
    Wiley-VCH Verlag
    Journal
    Small
    DOI
    10.1002/smll.201303898
    10.1002/smll.201470081
    ae974a485f413a2113503eed53cd6c53
    10.1002/smll.201303898
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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