Low-temperature synthesis of LiCoO 2 with eutectic of lithium precursors via the solid-state reaction method

Abstract

Lithium cobalt oxide powders have been prepared via the solid-state reaction method at lower temperatures (650 and 750°C) and in a shorter time (2 h). The eutectic effects of LiOH· H 2 O and Li 2 CO 3 salts on the formation of LiCoO 2 was investigated. The effects of the molar ratio of LiOH·H 2 O to Li 2 CO 3 , the sintering temperature and the molar ratio of Li/Co on the physicochemical properties of LiCoO 2 powders were examined, especially, by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and charge-discharge cycling tests. LiCoO 2 prepared at 750°C and 2 h with a molar ratio (9:1) between these of LiOH·H 2 O and Li 2 CO 3 showed the best electrochemical properties (discharge capacity 98.3 mAhg −1 and capacity retention 80.7% after 50 cycles at 1C).