Insight into the limited electrochemical activity of NaVP2O7

Yongho Kee, Nikolay Dimov, Aleksandar Staikov, Prabeer Barpanda, Ying Ching Lu, Keita Minami, Shigeto Okada

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)64991-64996
Number of pages6
JournalRSC Advances
Volume5
Issue number80
DOIs
Publication statusPublished - Jul 24 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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