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Issue 42, 2017
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Development of a new alluaudite-based cathode material with high power and long cyclability for application in Na ion batteries in real-life

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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 enabled rapid Na (de)intercalation without a 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 an average voltage of ∼3.1 V (vs. Na+/Na). At 30C, which denotes the rapid 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 can be attributed to the low volume change (∼1%) during charge/discharge.

Graphical abstract: Development of a new alluaudite-based cathode material with high power and long cyclability for application in Na ion batteries in real-life

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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, 2017,5, 22334-22340
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    Development of a new alluaudite-based cathode material with high power and long cyclability for application in Na ion batteries in real-life

    J. Kim, H. Kim, S. Lee and S. Myung, J. Mater. Chem. A, 2017, 5, 22334
    DOI: 10.1039/C7TA06693G

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