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Issue 14, 2016
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Comparison of amorphous, pseudohexagonal and orthorhombic Nb2O5 for high-rate lithium ion insertion

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Abstract

Amorphous, pseudohexagonal and orthorhombic Nb2O5 nanoparticles were synthesized using a facile and green sol–gel process followed by thermal treatment at 450 °C, 600 °C and 800 °C for 3 h in air, respectively. The resulting materials have been subjected to a detailed experimental study and comparison of their structural, electrical and electrochemical properties. The experiments have demonstrated that the pseudohexagonal Nb2O5 (TT-Nb2O5) exhibited higher storage capacity, largely due to its high specific surface area and small crystallites, and better cycling performance than both amorphous Nb2O5 (a-Nb2O5) and orthorhombic Nb2O5 (T-Nb2O5); such experimental findings were found to be associated with and thus ascribed to the lower charge transfer resistance and higher lithium ion diffusion coefficient of TT-Nb2O5 than those of a-Nb2O5 and T-Nb2O5. This research contributes to a better fundamental understanding of the relationship between the crystal structure and the crystallinity and electrochemical properties, particularly Li-ion storage properties, and leads to a possible new advancement in the research field of lithium ion batteries and pseudocapacitors.

Graphical abstract: Comparison of amorphous, pseudohexagonal and orthorhombic Nb2O5 for high-rate lithium ion insertion

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Publication details

The article was received on 23 Oct 2015, accepted on 01 Mar 2016 and first published on 01 Mar 2016


Article type: Paper
DOI: 10.1039/C5CE02069G
Citation: CrystEngComm, 2016,18, 2532-2540
  • Open access: Creative Commons BY license
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    Comparison of amorphous, pseudohexagonal and orthorhombic Nb2O5 for high-rate lithium ion insertion

    S. Li, Q. Xu, E. Uchaker, X. Cao and G. Cao, CrystEngComm, 2016, 18, 2532
    DOI: 10.1039/C5CE02069G

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