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An Efficient Evaluation of F-doped Polyanion Cathode Materials with Long Cycle Life for Na-Ion Batteries Applications

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      Abstract

      A series of Na3−xV2(PO4−xFx)3 (x = 0, 0.1, 0.15 and 0.3) polyanion cathode materials are synthesized via a sol-gel method. The optimal doping concentration of F in Na3V2(PO4)3 is 0.15 mol %. By neutron powder diffraction data, the chemical composition of as-synthesized material is Na2.85V2(PO3.95F0.05)3. The half-cell of Na2.85V2(PO3.95F0.05)3 cathode exhibits a stable discharge capacity of 103 mAh g−1 and 93% of capacity retention over 250 cycles without decay at 0.1 A g−1, which is higher than that of bare Na3V2(PO4)3 (98 mAh g−1). The high rate capability of Na2.85V2(PO3.95F0.05)3 is also dramatically enhanced via increase the conductivity of host material by F-doping. Moreover, the symmetrical Na-ion full-cell is fabricated using Na2.85V2(PO3.95F0.05)3 as cathode and anode materials. It is achieved that the good reversibility and superior cycling stability about 98% of capacity retention with ~100% of coulombic efficiency at 1.0 A g−1 throughout 1000 cycles. These results demonstrate that the optimal amount of Na2.85V2(PO3.95F0.05)3 is a distinctive potential candidate for excellent long-term cyclic stability with high rate low-cost energy storage applications.

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      Research development on sodium-ion batteries.

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        The emerging chemistry of sodium ion batteries for electrochemical energy storage.

        Energy storage technology has received significant attention for portable electronic devices, electric vehicle propulsion, bulk electricity storage at power stations, and load leveling of renewable sources, such as solar energy and wind power. Lithium ion batteries have dominated most of the first two applications. For the last two cases, however, moving beyond lithium batteries to the element that lies below-sodium-is a sensible step that offers sustainability and cost-effectiveness. This requires an evaluation of the science underpinning these devices, including the discovery of new materials, their electrochemistry, and an increased understanding of ion mobility based on computational methods. The Review considers some of the current scientific issues underpinning sodium ion batteries.
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          Superior Electrochemical Performance and Storage Mechanism of Na3V2(PO4)3Cathode for Room-Temperature Sodium-Ion Batteries

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            Author and article information

            Affiliations
            [1 ]ISNI 0000 0004 0532 2121, GRID grid.411649.f, Department of Chemical Engineering, Chung Yuan Christian University, ; Taoyuan City, Chungli, 32023 Taiwan ROC
            [2 ]ISNI 0000 0004 0532 2121, GRID grid.411649.f, Department of Physics, Chung Yuan Christian University, ; Taoyuan City, Chungli, 32023 Taiwan ROC
            [3 ]ISNI 0000 0001 0749 1496, GRID grid.410766.2, Neutron Group, National Synchrotron Radiation Research Center, ; Hsinchu City, 30076 Taiwan ROC
            Contributors
            wrliu1203@gmail.com
            Journal
            Sci Rep
            Sci Rep
            Scientific Reports
            Nature Publishing Group UK (London )
            2045-2322
            1 November 2017
            1 November 2017
            2017
            : 7
            29093535
            5665866
            13718
            10.1038/s41598-017-13718-0
            © The Author(s) 2017

            Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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