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High valence Mo-doped Na3V2 (PO4)3/C as a high-rate and long-life cathode for Sodium ion batteries

Abstract

NASCON-structure Na3V2(PO4)3 (NVP) is a considerable cathode material for sodium ion battery, which is still confronted low rate performance for its poor conductivity. To address this problem, high-valance Mo6+ ion was introduced into NVP. The crystal structure, electrochemical performances, sodium ion diffusion kinetics and ion transfer mechanism of high valence Mo-doped Na3-5xV2-xMox(PO4)3/C (0< x < 0.04) have been investigated. X-ray diffraction, electron microscopy and XPS data confirmed high purity NASICON phosphate phases. The Na ion diffusion process was identified through CV measurement, which clearly shows fast sodium ion transportations in the Mo-doped NASICON materials. Meanwhile, DFT calculations prove the Na ion diffusion is promoted by Mo doping. Benefiting from superior Na ion kinetics, Na2.9V1.98Mo0.02(PO4)3 performed 90 mAh g-1 at 10 C and preserved 83.5% capacity retention after 500 cycles. Our studies demonstrate high-valence Mo doped Na3V2(PO4)3/C is a promising cathode material for sodium ion batteries with super high rate and long life.

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Publication details

The article was received on 12 Oct 2017, accepted on 13 Nov 2017 and first published on 13 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08970H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    High valence Mo-doped Na3V2 (PO4)3/C as a high-rate and long-life cathode for Sodium ion batteries

    X. Li, Y. Huang, J. wang, L. Miao, Y. Li, Y. Liu, Y. Qiu, C. Fang, J. Han and Y. Huang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08970H

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