Disclosed is a positive active material of for a rechargeable lithium battery and a method of preparing the same. The positive active material is represented by formula 1: Li.sub.x Mn.sub.2-a-b Cr.sub.a M.sub.b O.sub.4+z [formula 1] where x.gtoreq.2; 0.25 Se divulga un material activo positivo para de una batería recargable del litio y de un método de preparar igual. El material activo positivo es representado por el fórmula 1: Li.sub.x Mn.sub.2-a-b Cr.sub.a M.sub.b O.sub.4+z [ fórmula 1 ] donde x.gtoreq.2; 0.25

 
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