Abstract
This paper investigates the electrochemical properties of CuFeO2 prepared by using a malate precursor method as negative electrodes for sodium-ion batteries. In the voltage range of 0.01 to 3.0 V, the oxide calcined at 750C shows a poor cycle property of 27 mAh/g at 10 cycles, although it exhibits the large first discharge capacity of 579 mAh/g. The cycle property is improved to up to 122 mAh/g at 10 cycles by employing a cycle condition with the voltage range of 0.01 to 1.5 V. The results suggest that the sodium-ion insertion/extraction mechanism in CuFeO2 would involve valence changes of Fe ions in the oxide from the Fe3+ state to Fe0 state in the discharge process and from Fe0 to Fe3+ in the charge process.
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