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Tailoring a novel cathode material with extremely high power and long cyclability for application of Na-ion batteries in real-life

Abstract

We report Na2Fe1.96V0.96(PO4)3 (NFVP) as a new cathode material for Na ion batteries with outstanding cycle life and high power density for the first time. Structural characterization of NFVP was performed using Rietveld refinement of X-ray diffraction and neutron diffraction patterns, which revealed large Na diffusion paths in the structure that enable fast Na (de)intercalation without large volume change. Using X-ray diffraction and X-ray photoelectron spectroscopy with charge/discharge measurements, it was confirmed that based on redox reactions of Fe and V ions, ~2 Na ions are reversibly (de)intercalated from the structure with the average voltage of ~3.1V (vs. Na+/Na). At 30C, which is very fast charge/discharge, ~74% of the theoretical capacity was delivered. Furthermore, NFVP exhibited an outstanding cycle life of over 2500 cycles (~70% retention of the initial capacity), which is attributed to the low volume change (~1%) during charge/discharge.

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Publication details

The article was received on 30 Jul 2017, accepted on 09 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA06693G
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Tailoring a novel cathode material with extremely high power and long cyclability for application of Na-ion batteries in real-life

    J. Kim, H. Kim, S. Lee and S. Myung, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06693G

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