Disclosed is a positive active material for a lithium secondary battery having high capacity and long durability properties, and particularly to a powder of LiaNi1-x-yCoxMyO2-zFz and LiaNi1-x-yCoxMyO2-zSz (where M is a metal selected from the group consisting of Al, Mg, Sr, La, Ce, V, and Ti, and wherein 0.ltoreq.x<0.99, 0.01.ltoreq.y.ltoreq.0.1, 0.01.ltoreq.z.ltoreq.0.1, and 1.00.ltoreq.a.ltoreq.1.1) an oxygen in LiaNi1-x-yCoxMyO2 is substituted with F or S whereby the durability, capacity and structural safety of the positive active material is increased.

Se divulga un material activo positivo para una batería secundaria del litio que tiene alta capacidad y características largas de la durabilidad, y particularmente a un polvo de LiaNi1-x-yCoxMyO2-zFz y de LiaNi1-x-yCoxMyO2-zSz (donde está un metal M seleccionado del al del grupo, del magnesio, del sr, del la, del ce, del V, y del ti que consisten en, y en donde 0.ltoreq.x