Lithium accumulators based on lithiated iron phosphate and carbon

A method of manufacturing a composite material of lithium iron phosphate and carbon comprising high energy ball milling in which the maximum relative speed of the balls is greater than 4 m/s, so as to impart to the mixture of precursors a mechanical activation energy sufficient to obtain micrometric mixed aggregates of nanometric particles and in that the milling has a duration of less than two hours as well as the composite electrode material, the electrode and the cell obtained therefrom.