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Issue 9, 2017
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Highly reversible sodium storage in a GeP5/C composite anode with large capacity and low voltage

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Abstract

Sodium ion batteries (SIBs) are considered to be a promising alternative to lithium ion batteries because of the high abundance of sodium. However, the scarcities of suitable anode materials severely hamper the development of SIBs. Here, we synthesized a GeP5/C composite with binary sodium-reactive components on a large scale. Theoretically, it can promise a capacity of 1888 mA h g−1 or 6891 mA h cm−3, which is the best record in anodes for SIBs reported so far. In practice, the GeP5/C showed a low potential of ≈0.4 V vs. Na+/Na with a smooth charge/discharge profile. It delivered a large reversible capacity of 1250 mA h g−1 with a first coulombic efficiency of 93%. Electrochemical-mechanism studies suggested that the formation of a GeP5 phase endowed a high first coulombic efficiency and synergetic effect between the sodiation of Ge and P. This effect smoothly leveled the multistep plateaus and effectively reduced the polarization between charge/discharge. When applied to a full cell by coupling a Na3V2(PO4)3/C cathode, the assembled Na3V2(PO4)3//GeP5 full cell showed a large capacity of 800 mA h g−1 with a high average output voltage of 2.65 V. The excellent sodium-storage performances of GeP5/C will ensure commercial utilization in future SIBs.

Graphical abstract: Highly reversible sodium storage in a GeP5/C composite anode with large capacity and low voltage

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Publication details

The article was received on 05 Jan 2017, accepted on 03 Feb 2017 and first published on 03 Feb 2017


Article type: Paper
DOI: 10.1039/C7TA00139H
Citation: J. Mater. Chem. A, 2017,5, 4413-4420

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    Highly reversible sodium storage in a GeP5/C composite anode with large capacity and low voltage

    W. Li, L. Ke, Y. Wei, S. Guo, L. Gan, H. Li, T. Zhai and H. Zhou, J. Mater. Chem. A, 2017, 5, 4413
    DOI: 10.1039/C7TA00139H

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