Insight into the limited electrochemical activity of NaVP2O7

Kee, Yongho and Dimov, Nikolay and Staikov, Aleksandar and Barpanda, Prabeer and Lu, Ying-Ching and Minami, Keita and Okada, Shigeto (2015) Insight into the limited electrochemical activity of NaVP2O7. In: RSC ADVANCES, 5 (80). pp. 64991-64996.

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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.

Item Type:	Journal Article
Publication:	RSC ADVANCES
Publisher:	ROYAL SOC CHEMISTRY
Additional Information:	Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	03 Sep 2015 06:31
Last Modified:	03 Sep 2015 06:31
URI:	http://eprints.iisc.ac.in/id/eprint/52301

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