Lithium batteries containing lithium-bearing iron phosphate and carbon

An electrode material having the following formula LiαFeβBγPO4/C, wherein 0.85≦α≦1.08, 0≦γ/β≦0.1 and γ+β≦1, wherein it appears as microforged micrometric mixed aggregates of nanometric particles, said nanometric particles having a maximum size, as measured by transmission microscopy, of less than 50 nm, and said microforged micrometric mixed aggregates having an average size (D50), as measured by laser grain size measurement in methanol comprised between 0.5 and 60 μm, preferably between 1 and 45 μm, and more preferentially from 2 to 15 μm.