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Issue 80, 2015
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Insight into the limited electrochemical activity of NaVP2O7

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Recently, LiVP2O7 has been investigated as a possible high-voltage substitute for Li2FeP2O7. However, its Na-equivalent, NaVP2O7, as an economic replacement for Li2FeP2O7 has not yet been well understood. Here, for the first time, we report the feasibility of NaVP2O7 as a 3.4 V cathode material for Na-ion batteries. Having a theoretical capacity of 108 mA h g−1, it shows an initial discharge capacity of 38.4 mA h g−1 at 1/20C (1C = 108 mA g−1) in the voltage range of 2.5–4.0 V. Our study suggests that part of the sodium ions in the lattice structure exist as structural stabilizers and bring lattice distortion upon desodiation. This study also shows that the title compound, NaVP2O7, suffers from high intrinsic internal resistance, which limits the phase transition kinetics between pristine NaVP2O7 and desodiated Na1−xVP2O7.

Graphical abstract: Insight into the limited electrochemical activity of NaVP2O7

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The article was received on 24 Jun 2015, accepted on 24 Jul 2015 and first published on 30 Jul 2015

Article type: Paper
DOI: 10.1039/C5RA12158B
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RSC Adv., 2015,5, 64991-64996

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    Insight into the limited electrochemical activity of NaVP2O7

    Y. Kee, N. Dimov, A. Staikov, P. Barpanda, Y. Lu, K. Minami and S. Okada, RSC Adv., 2015, 5, 64991
    DOI: 10.1039/C5RA12158B

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