Non-aqueous electrolyte secondary cell and manufacturing process of positive active material therefor

摘要

Lithium composite metal oxides prepared by mixing two or more hydroxides of different types of metal selected from the group of nickel, cobalt, manganese and aluminum and a lithium compound of which the D50 value is in the range 5 to 50 µm, the D90 value is 90 µm or smaller, and in which particles 100 µm or greater in particle size do not exist, followed by calcinating in the temperature range 700 to 1000°C and for 2 to 30 hours, and grinding, are used as the active materials of a positive electrode which is laminated with a negative electrode with a separator interposed and spirally wound thereby forming an electrode group. By using the positive active materials prepared in this manner, discharge capacity and cycle characteristic of a non-aqueous electrolyte secondary cell can be improved.