Abstract

Layered vanadium oxychloride (VOCl) was tested as cathode material for rechargeable sodium ion batteries. Electrochemical characterization showed that the VOCl electrode can deliver a discharge capacity of 120 mAh g− 1 at a 0.5 C rate in a voltage range of 1.0–3.0 V vs Na/Na+. A capacity of 80 mAh g− 1 was obtained after 55 cycles at 1 C rate. A combination of intercalation and conversion type reaction of VOCl with Na has been identified by energy-dispersive X-ray spectroscopy (EDX) and ex situ X-ray diffraction (XRD). The results demonstrate the principle feasibility of using VOCl as cathode material for rechargeable sodium ion batteries.

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