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Lithium-ion batteries; cathode material; LiVPO₄F; surface modification.

In this paper, we reveal that the intrinsic low electronic conductivity of the pristine LiVPO₄F is overcome with conductive Cu-coating. The existence of nano-Cu is confirmed with X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS). The morphology and particle size are observed by scanning electron microscopy (SEM). Galvanostatic charge/discharge test indicates that Cu coating is effective to improve the discharge capacity, cycle performance and rate capability. Analysis of electrochemical impedance spectra (EIS) shows that the addition of nano-Cu markedly decreases the charge transfer resistance of the pristine LiVPO₄F electrode.

Yu Zhang¹ Xiaolan Bai² Cuiling Li¹

1. School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
2. School of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

Published

August 2015

Manuscript received

17 January 2015

Manuscript revised

15 April 2015

Accepted

14 May 2015