Abstract
Conventional cathode material (LiCoO 2) was modified by coating with a thin layer of La 2O 3/Li 2O/TiO 2 for improving its performance for lithium ion battery. The morphology and structure of the modified cathode material was characterized by SEM, XRD, and Auger electron spectroscopy. The performance of the cells with the modified cathode material was examined, including the cycling stability, the diffusion coefficient under different voltages, and the C-rate discharge. The results showed that the cell composed of the coated cathode material discharged at a large current density, and possesses a stable cycle performance in the range from 3.0 to 4.4 V. It was explained that the rate of Li ion diffusion increased in the cell while using La 2O 3/Ti 2O/TiO 2-coated LiCoO 2 as the cathode and the coating layer may act as a faster ion conductor (La 2O 3/Ti 2O/TiO 2).
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