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Superior Na-Storage Performance of Molten-State-Blending Synthesized Monoclinic NaVPO4F Nanoplates for Na-Ion Batteries

Abstract

A superior monoclinic NaVPO4F nanoplate for Na ion batteries has been prepared by a molten-state-blending technique. By this molecular level blending method, the nanoscale laminated NaVPO4F@C sample with high crystallinity can be obtained. High thermal stability, stable Na+ insertion/extraction as well as superior electron/Na+ transport of NaVPO4F have been elucidated by temperature dependent IR, in-situ XRD and kinetics investigation. Accordingly, the as prepared NaVPO4F with moderate carbon coating exhibits superior Na-storage performance. It can deliver a high initial specific capacity of 135.0 mA h g−1 at 0.2 C, ultra-high rate performance (up to 112.1mA h g-1 at 30 C) and super-stable cycling performance (capacity fading rate of 0.0064 % cycle-1 during 1500 cycles at 20 C). The potential application of NaVPO4F as the anode has been explored, and a symmetrical battery with NaVPO4F as both the anode and cathode has been successfully assembled for the first time. More significantly, in-situ XRD and ex-situ NMR have been employed to explore the charge-discharge behavior during an electrochemical cycle of SIB, and the result clearly demonstrates less than one Na has been intercalated/extracted from NaVPO4F during charging/discharging process

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Publication details

The article was received on 11 Sep 2018, accepted on 01 Nov 2018 and first published on 03 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA08842J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Superior Na-Storage Performance of Molten-State-Blending Synthesized Monoclinic NaVPO4F Nanoplates for Na-Ion Batteries

    M. Ling, F. Li, H. Yi, X. Li, G. Hou, Q. Zheng and H. Zhang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08842J

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