Lithium cobalt oxide powders have been successfully prepared by a molten-salt synthesis (MSS) method using a eutectic mixture of LiCl and Li2CO3 salts. The physico-chemical properties of the lithium cobalt oxide powders are investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), particle-size analysis and charge-discharge cycling. A lower temperature and a shorter time (approximately 700 °C and 1 h) in the Li:Co = 7 system are sufficient to prepare single-phase HT-LiCoO2 powders by the MSS method, compared with the solid-state reaction method. Charge-discharge tests show that the lithium cobalt oxide prepared at 800 °C has an initial discharge capacity as high as 140 mA h g-1, and 100 mA h g-1 after 40 cycles. The dependence of the synthetic conditions of HT-LiCoO2 on the reaction temperature, time and amount of flux with respect to starting oxides is extensively investigated.
Bibliographical noteFunding Information:
The authors gratefully acknowledge the direct support of this work by the Korea Research Foundation (KRF 99-042-E000 75 E3107) and the LG Chemical Ltd.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering