The positive active material for secondary battery according to the
invention comprises O, Fe in an amount of higher than 25% by weight, and V
in an amount of from higher than 0% by weight to less than 35% by weight.
The positive active material, when it is free of lithium, exhibits the
following main peaks by the X-ray diffractometry using CuK.alpha. rays: a
peak within a 2.theta. range of from greater than 26.degree. to less than
29.degree. and a peak within a 2.theta. range of from greater than
29.degree. to less than 32.degree.. The non-aqueous secondary battery
having a positive electrode comprising this positive active material
exhibits a high capacity and good cycle life performance and is
inexpensive and environmentally friendly.
