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Issue 32, 2017
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Hierarchically organized CNT@TiO2@Mn3O4 nanostructures for enhanced lithium storage performance

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Abstract

Here a new concept is conceived to design CNT@TiO2@Mn3O4 nanostructures, in which CNTs, TiO2 nanosheets and Mn3O4 nanoparticles are hierarchically organized in a three-stage order. In this concept, each component plays a unique, indispensable role. In the first stage, 1D CNTs serve not only as a backbone to accommodate mechanical stress, but also as a conductive dopant to facilitate electron transport. In the second stage, 2D TiO2 nanosheets act as a major active material to ensure high safety and a long cycle life. In the third stage, 0D Mn3O4 nanoparticles function as an auxiliary active material to contribute an extraordinarily high theoretical capacity. Besides, the CNTs can minimize the restacking of the TiO2 nanosheets, thus guaranteeing good structural integrity. TiO2 nanosheets, being flexible and elastic in nature, are able to inhibit the aggregation of Mn3O4 nanoparticles, as well as buffer the volume variation suffered during repeated lithiation/delithiation. Mn3O4 nanoparticles, in turn, are capable of physically isolating the TiO2 nanosheets to enlarge their interlayer distances for easy lithium and electron access. Thanks to the significant synergy, CNT@TiO2@Mn3O4 nanostructures exhibit enhanced cycle and rate performances and represent a new step towards high-performance anode candidates of lithium-ion batteries.

Graphical abstract: Hierarchically organized CNT@TiO2@Mn3O4 nanostructures for enhanced lithium storage performance

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Publication details

The article was received on 31 Mar 2017, accepted on 20 Jul 2017 and first published on 20 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA02823G
Citation: J. Mater. Chem. A, 2017,5, 17048-17055
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    Hierarchically organized CNT@TiO2@Mn3O4 nanostructures for enhanced lithium storage performance

    D. Yan, X. Zhu, Y. Mao, S. Qiu, L. Gu, Y. Feng and K. Sun, J. Mater. Chem. A, 2017, 5, 17048
    DOI: 10.1039/C7TA02823G

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