Abstract
The electrochemical properties of LiNi1-yAlyO2 (0≤y≤0.1) powder prepared by emulsion method were investigated. The emulsion-derived powder was calcined at the temperature range of 700-800°C for various times. A single phase of LiNi1-yAlyO2 solid solution was formed at 750°C. The composition of LiNi0.99Al0.01O2 synthesized at 750°C for 36 h demonstrated the largest discharge capacity and showed an improved cycle life. The initial and final discharge capacities were 168 and 156 mAh/g, respectively, during 20 cyclic tests. The fading rate in discharge capacity after 20 cycles was only 7%, which was lower than the 8.7% of LiNiO2. The optimum condition for the synthesis of LiNi1-yAlyO2 was by heating at 750°C for 36 h in an oxygen stream.
