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  • Engineering of Oxygen Vacancy and Electric-Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

    Author(s)
    Meng, Tao
    Li, Bo
    Hu, Lei
    Yang, Hao
    Fan, Wenjie
    Zhang, Shanqing
    Liu, Peng
    Li, Mingyang
    Gu, Feng Long
    Tong, Yexiang
    Griffith University Author(s)
    Zhang, Shanqing
    Year published
    2019
    Metadata
    Show full item record
    Abstract
    Rational design of nanostructured electrode materials is highly desired for developing high‐performance lithium‐ion batteries (LIBs). Encapsulating electrode materials in reduced graphene oxide (rGO) shows great potential for manipulation of physicochemical properties at the atomic level, promoting remarkable electrochemical properties. Here, a controllable strategy is proposed to synthesize a “pomegranate‐like” 3D rGO encapsulated lithium titanate composite (CT‐rGO@LTO). The experimental results demonstrate the enriched oxygen vacancies in LTO and the electronic interactions at the interface between LTO and rGO. Density ...
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    Rational design of nanostructured electrode materials is highly desired for developing high‐performance lithium‐ion batteries (LIBs). Encapsulating electrode materials in reduced graphene oxide (rGO) shows great potential for manipulation of physicochemical properties at the atomic level, promoting remarkable electrochemical properties. Here, a controllable strategy is proposed to synthesize a “pomegranate‐like” 3D rGO encapsulated lithium titanate composite (CT‐rGO@LTO). The experimental results demonstrate the enriched oxygen vacancies in LTO and the electronic interactions at the interface between LTO and rGO. Density functional theory (DFT) calculations confirm the charge redistribution in the CT‐rGO@LTO composite, establishing a strong electric field with oxygen vacancies. Furthermore, the extra active sites in rGO for Li‐ion storage are investigated via in situ Raman tests. Benefiting from the oxygen vacancies and the electric‐field effect, the CT‐rGO@LTO electrode delivers excellent cycling stability with a capacity retention of 87.1% after 1500 cycles at 5 C. Moreover, the CT‐rGO@LTO electrode is adopted to assemble a full cell with a LiCoO2 cathode, which also displays superior rate capability with capacities of 139.4 and 109.7 mA h g−1 at 0.5 and 10 C, respectively. This work provides profound insights of fabricating high‐performance electrode materials for advanced energy storage.
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    Journal Title
    Small Methods
    Volume
    3
    Issue
    10
    DOI
    https://doi.org/10.1002/smtd.201900185
    Subject
    Chemical sciences
    Science & Technology
    Physical Sciences
    Technology
    Chemistry, Physical
    Nanoscience & Nanotechnology
    Publication URI
    http://hdl.handle.net/10072/396683
    Collection
    • Journal articles

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