Abstract
Powder of the cathode material, LiNixMn2-xO4 (0≤x≤0.2) was prepared by emulsion method and calcined at 800°C for 48h in air. The calcined powder showed a spinel structure and a spherical morphology. The average particle size and the specific surface area were 0.17μm and 34m2/g, respectively. Charge-discharge tests were carried out galvanostatically in a voltage range between 3.0V and 4.5V. The composition of LiNi0.025Mn1.975O4 showed an improved discharge capacity, 123.4mA·h/g and a stable cycle life during charge-discharge cycling. The plateau range near 4.0V became narrow as the amount of nickel increased. Another plateau range was observed near 4.6V which became broader with increasing x.
