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Synthesis of Uniform Hierarchical Na3V1.95Mn0.05(PO4)2F3@C Hollow Microspheres as a Cathode Material for Sodium Ion Batteries

Abstract

Uniform hierarchical Na3V1.95Mn0.05(PO4)2F3@C hollow microspheres composed of nanoparticles and nanoplates were successfully synthesized by one-step polyol assisted hydrothermal method combined with chemical vapor deposition (CVD) technique. We have also investigated the formation mechanism of hierarchical hollow microspheres, which shows that both tetraethylene glycol and citric acid play important roles in the formation of hietarchical hollow microspheres.The Na3V1.95Mn0.05(PO4)2F3@C shows an initial reversible capacity of 122.9 mA h g−1 and the discharge capacity of 109 mA h g−1 is maintained with the columbic efficiency of 99.1% after 500 cycles. The unique architecture, enhanced electronic conductivity and improved diffusion coefficient of sodium ion for Na3V2(PO4)2F3 by Mn2+ doping and carbon coating account for the enhanced electrochemical properties. Therefore, we provide an approach desiging tunable structure for multi-element compounds with enhanced electrochemical performance as a promising cathode mareial for practical application.

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Publication details

The article was received on 20 Dec 2017, accepted on 05 Feb 2018 and first published on 05 Feb 2018


Article type: Paper
DOI: 10.1039/C7TA11105C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Synthesis of Uniform Hierarchical Na3V1.95Mn0.05(PO4)2F3@C Hollow Microspheres as a Cathode Material for Sodium Ion Batteries

    Y. Zhang, S. Guo and H. Xu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA11105C

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