Synthesis and Characterization of Cui11V6O26 as High—Capacity Cathodes for Lithium Secondary Batteries via a Wet—Chemistry Route

Abstract

The cathode material of Cu11 V6 026 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 Cu11 V6 026 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 Cu11 V6 026 powder might take place after the first cycle according to cyclic voltammetry test, which should be responsible for its irreversible capacity.