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Issue 44, 2019
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Zinc niobate materials: crystal structures, energy-storage capabilities and working mechanisms

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Abstract

W5Nb16O55 is a very promising negative electrode compound for lithium-ion storage owing to its good safety, durable cyclability and high rate performance. However, its commercialization is hindered by its limited capacity and high tungsten cost. Here, we designed a tungsten-free and niobium-rich zinc niobate (Zn2Nb34O87) with a large capacity (theoretically 389 mA h g−1) as a new insertion negative electrode compound. Micron-sized Zn2Nb34O87 blocks (Zn2Nb34O87-B) and one-dimensional Zn2Nb34O87 nanofibers (Zn2Nb34O87-N) were prepared via a solid-state reaction and electrospinning methods, respectively. Zn2Nb34O87-B and Zn2Nb34O87-N have 3 × 4 × ∞ shear ReO3 crystal structures of orthorhombic and monoclinic types, respectively. Both the Zn2Nb34O87 materials exhibited better electrochemical performance than W5Nb16O55 in terms of the capacity, lithium-ion diffusion coefficient, intercalation pseudocapacitive contribution, rate performance, and cyclability. In situ X-ray diffraction characterization demonstrated the excellent structural stability and electrochemical reversibility of Zn2Nb34O87, and revealed that lithium ions were stored in the (010) crystallographic planes. Furthermore, a LiNi0.5Mn1.5O4‖Zn2Nb34O87-N full cell exhibited outstanding electrochemical performance, including a large capacity, prominent rate performance, and especially ultra-long cyclability (96.5% capacity retention even after 1000 cycles at 5C). Therefore, Zn2Nb34O87 holds great promise as a practical negative electrode compound for large-capacity, cost-effective, rapid, durable and safe lithium-ion storage.

Graphical abstract: Zinc niobate materials: crystal structures, energy-storage capabilities and working mechanisms

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Publication details

The article was received on 19 Jul 2019, accepted on 20 Oct 2019 and first published on 31 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA07818E
J. Mater. Chem. A, 2019,7, 25537-25547

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    Zinc niobate materials: crystal structures, energy-storage capabilities and working mechanisms

    X. Zhu, H. Cao, R. Li, Q. Fu, G. Liang, Y. Chen, L. Luo, C. Lin and X. S. Zhao, J. Mater. Chem. A, 2019, 7, 25537
    DOI: 10.1039/C9TA07818E

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