Sea urchin-like NiCoO2@C nanocomposites for Li-ion batteries and supercapacitors

Jin Liang, Kai Xi, Guoqiang Tan, Sheng Chen, Teng Zhao, Paul R. Coxon, Hyun Kyung Kim, Shujiang Ding*, Yuan Yang, R. Vasant Kumar, Jun Lu

*此作品的通讯作者

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129 引用 (Scopus)

摘要

The rational construction of battery electrode architecture that offers both high energy and power densities on a gravimetric and volumetric basis is a critical concern but achieving this aim is beset by many fundamental and practical challenges. Here we report a new sea urchin-like NiCoO2@C composite electrode architecture composed of NiCoO2 nanosheets grown on hollow concave carbon disks. Such a unique structural design not only preserves all the advantages of hollow structures but also increases the packing density of the active materials. NiCoO2 nanosheets grown on carbon disks promote a high utilization of active materials in redox reactions by reducing the path length for Li+ ions and for electron transfer. Meanwhile, the hollow concave carbon not only reduces the volume change, but also improves the volumetric energy density of the entire composite electrode. As a result, the nanocomposites exhibit superior electrochemical performance measured in terms of high capacity/capacitance, stable cycling performance and good rate capability in both Li-ion battery and supercapacitor applications. Such nanostructured composite electrode may also have great potential for application in other electrochemical devices.

源语言英语
页(从-至)457-465
页数9
期刊Nano Energy
27
DOI
出版状态已出版 - 1 9月 2016
已对外发布

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Liang, J., Xi, K., Tan, G., Chen, S., Zhao, T., Coxon, P. R., Kim, H. K., Ding, S., Yang, Y., Kumar, R. V., & Lu, J. (2016). Sea urchin-like NiCoO2@C nanocomposites for Li-ion batteries and supercapacitors. Nano Energy, 27, 457-465. https://doi.org/10.1016/j.nanoen.2016.06.032