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Interface-modulated fabrication of hierarchical yolk–shell Co3O4/C dodecahedrons as stable anodes for lithium and sodium storage

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Abstract

Transition-metal oxides (TMOs) have gradually attracted attention from researchers as anode materials for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) because of their high theoretical capacity. However, their poor cycling stability and inferior rate capability resulting from the large volume variation during the lithiation/sodiation process and their low intrinsic electronic conductivity limit their applications. To solve the problems of TMOs, carbon-based metal-oxide composites with complex structures derived from metal–organic frameworks (MOFs) have emerged as promising electrode materials for LIBs and SIBs. In this study, we adopted a facile interface-modulated method to synthesize yolk–shell carbon-based Co3O4 dodecahedrons derived from ZIF-67 zeolitic imidazolate frameworks. This strategy is based on the interface separation between the ZIF-67 core and the carbon-based shell during the pyrolysis process. The unique yolk–shell structure effectively accommodates the volume expansion during lithiation or sodiation, and the carbon matrix improves the electrical conductivity of the electrode. As an anode for LIBs, the yolk–shell Co3O4/C dodecahedrons exhibit a high specific capacity and excellent cycling stability (1,100 mAh·g−1 after 120 cycles at 200 mA·g−1). As an anode for SIBs, the composites exhibit an outstanding rate capability (307 mAh·g−1 at 1,000 mA·g−1 and 269 mAh·g−1 at 2,000 mA·g−1). Detailed electrochemical kinetic analysis indicates that the energy storage for Li+ and Na+ in yolk–shell Co3O4/C dodecahedrons shows a dominant capacitive behavior. This work introduces an effective approach for fabricating carbonbased metal-oxide composites by using MOFs as ideal precursors and as electrode materials to enhance the electrochemical performance of LIBs and SIBs.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2016YFA0202603), the National Basic Research Program of China (No. 2013CB934103), the National Natural Science Foundation of China (Nos. 51521001 and 51272197), the National Natural Science Fund for Distinguished Young Scholars (No. 51425204), the Fundamental Research Funds for the Central Universities (WUT: 22016III001, 2017IVA096) and the Foundation of National Excellent Doctoral Dissertation of PR China (No. 2016-YB-004); Prof. Liqiang Mai gratefully acknowledges the financial support from China Scholarship Council (No. 201606955096).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China

    Yuzhu Wu, Jiashen Meng, Qi Li, Chaojiang Niu, Xuanpeng Wang, Wei Yang, Wei Li & Liqiang Mai

  2. Department of Chemistry, University of California, Berkeley, California, 94720, USA

    Liqiang Mai

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  1. Yuzhu Wu
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Interface-modulated fabrication of hierarchical yolk–shell Co3O4/C dodecahedrons as stable anodes for lithium and sodium storage

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Wu, Y., Meng, J., Li, Q. et al. Interface-modulated fabrication of hierarchical yolk–shell Co3O4/C dodecahedrons as stable anodes for lithium and sodium storage. Nano Res. 10, 2364–2376 (2017). https://doi.org/10.1007/s12274-017-1433-6

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