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    Electrochemical Characteristics and Li+ Ion Intercalation Kinetics of Dual-phase Li4Ti5O12/Li2TiO3 Composite in Voltage Range of 0−3 V

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    acs2Ejpcc2E5b12114.pdf
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    Type
    Article
    Authors
    Bhatti, Humaira S
    Anjum, Dalaver H. cc
    Ullah, Shafiq
    Ahmed, Bilal cc
    Habib, Amir
    Karim, Altaf
    Hasanain, Syed Khurshid
    KAUST Department
    Advanced Nanofabrication Imaging and Characterization Core Lab
    Electron Microscopy
    Date
    2016-05-03
    Online Publication Date
    2016-05-03
    Print Publication Date
    2016-05-12
    Permanent link to this record
    http://hdl.handle.net/10754/607143
    
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    Abstract
    Li4Ti5O12, Li2TiO3 and dual-phase Li4Ti5O12/Li2TiO3 composite were prepared by sol-gel method with average particle size of 1 µm, 0.3 µm and 0.4 µm, respectively. Though Li2TiO3 is electrochemically inactive, the rate capability of Li4Ti5O12/Li2TiO3 is comparable to Li4Ti5O12 at different current rates. Li4Ti5O12/Li2TiO3 also shows good rate performance of 90 mA h g-1 at high rate of 10 C in voltage range of 1−3 V, attributable to increased interfaces in the composite. While Li4Ti5O12 delivers capacity retention of 88.6 % at 0.2 C over 50 cycles, Li4Ti5O12/Li2TiO3 exhibits no capacity fading at 0.2 C (40 cycles) and capacity retention of 98.45 % at 0.5 C (50 cycles). This highly stable cycling performance is attributed to the contribution of Li2TiO3 in preventing undesirable reaction of Li4Ti5O12 with the electrolyte during cycling. CV curves of Li4Ti5O12/Li2TiO3 in 0−3 V range exhibit two anodic peaks at 1.51 V and 0.7−0.0 V, indicating two modes of lithium intercalation into the lattice sites of active material. Owing to enhanced intercalation/de-intercalation kinetics in 0−3 V, composite electrode delivers superior rate performance of 203 mAh/g at 2.85 C and 140 mAh/g at 5.7 C with good reversible capacity retention over 100 cycles.
    Citation
    Electrochemical Characteristics and Li+ Ion Intercalation Kinetics of Dual-phase Li4Ti5O12/Li2TiO3 Composite in Voltage Range of 0−3 V, 2016 The Journal of Physical Chemistry C
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.5b12114
    Additional Links
    http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b12114
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.jpcc.5b12114
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