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Issue 46, 2014
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Structural enhancement of Na3V2(PO4)3/C composite cathode materials by pillar ion doping for high power and long cycle life sodium-ion batteries

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Abstract

Structurally stabilized Na3V2(PO4)3/C composite cathode materials with excellent electrochemical performance can be obtained by incorporating functional pillar ions into the structure. As pillar ions, K-ions have a larger ionic radius compared to Na-ions, and play an important role in enlarging the Na-ion diffusion pathway and in increasing the lattice volume by elongating the c-axis, thereby improving the rate performance. Furthermore, since the incorporated K-ions rarely participate in the electrochemical extraction/insertion reactions, they can stabilize the Na3V2(PO4)3 structure by suppressing significant lattice volume changes or structural distortion, even in a wide range of voltage windows accompanying multiple transitions of V ions and phase distortions. We investigated how the K-ion doping level affected the crystal structure and electrochemical properties of Na3V2(PO4)3 cathode materials for Na-ion batteries.

Graphical abstract: Structural enhancement of Na3V2(PO4)3/C composite cathode materials by pillar ion doping for high power and long cycle life sodium-ion batteries

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Publication details

The article was received on 31 Jul 2014, accepted on 08 Sep 2014 and first published on 08 Sep 2014


Article type: Paper
DOI: 10.1039/C4TA03948C
Citation: J. Mater. Chem. A, 2014,2, 19623-19632
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    Structural enhancement of Na3V2(PO4)3/C composite cathode materials by pillar ion doping for high power and long cycle life sodium-ion batteries

    S. Lim, D. Han, D. Nam, K. Hong, J. Eom, W. Ryu and H. Kwon, J. Mater. Chem. A, 2014, 2, 19623
    DOI: 10.1039/C4TA03948C

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