Synthesis and Characterization of Cu11V6O26 as High–Capacity Cathodes for Lithium Secondary Batteries via a Wet–Chemistry Route

The cathode material of Cu11V6O26 has been synthesized for the lithium secondary batteries via the wet-chemistry method. The as-prepared powders were characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM) and laser particle size analysis (LPSA). The electrochemical performances were evaluated by the galvanostatic discharge-charge and cyclic voltammetry technique. These results revealed that Cu11V6O26 powder could be formed at a temperature as low as 300 °C, and its particle size was smaller and distributed in a narrower range compared to the other powders synthesized at 400 °C and 500 °C. The initial discharge capacity of the powder synthesized at 300 °C whose D50% was only 24.251μm was 318.2 mAh/g. It was also found that a severe structure modification of Cu11V6O26 powder might take place after the first cycle according to cyclic voltammetry test, which should be responsible for its irreversible capacity.

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