Surface coating of lithium-manganese-rich layered oxides with delaminated MnO2 nanosheets as cathode materials for Li-ion batteries

Shaohua Guo, Haijun Yu, Pan Liu, Xizheng Liu, De Li, Mingwei Chen, Masayoshi Ishida, Haoshen Zhou

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    92 Citations (Scopus)

    Abstract

    Lithium-manganese-rich layered oxides are of great importance as cathode materials for rechargeable lithium batteries. In this article, Li 1.2Mn0.567Ni0.167Co0.066O 2 is prepared by a co-precipitation method, and the delaminated MnO2 nanosheets with different amounts, 1 wt%, 3 wt% and 5 wt%, are introduced for coating this material for the first time. The structure and morphology of these materials have been investigated via X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterizations. The results clearly demonstrate that the surface of lithium-manganese-rich layered oxides is covered by continuous delaminated MnO2 nanosheets. The electrochemical properties including the discharge capacity, initial coulombic efficiency, rate capability and cycle stability of these coated materials have been greatly enhanced, which are obviously related to the delaminated MnO2 nanosheet coating with good electrochemical activity and low charge transfer resistance. Moreover, the lithium-manganese-rich layered oxide coated with 3 wt% delaminated MnO 2 nanosheets presents the best comprehensive electrochemical properties as well as improves the initial discharge capacity and coulombic efficiency by 299 mA h g-1 and 88% respectively; the capacity retention after 50 cycles also reaches 93%, and the discharge capacity can be 157 mA h g-1 even at a 5 C discharge rate.

    Original languageEnglish
    Pages (from-to)4422-4428
    Number of pages7
    JournalJournal of Materials Chemistry A
    Volume2
    Issue number12
    DOIs
    Publication statusPublished - 2014 Mar 28

    ASJC Scopus subject areas

    • Chemistry(all)
    • Renewable Energy, Sustainability and the Environment
    • Materials Science(all)

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