Positive active material for secondary battery, process for preparation thereof and non-aqueous secondary battery comprising same

   
   

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.

 
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