Purification procedure surface of a graphite containing impurities with the aid of a dilute aqueous solution in NH4F and h2so4.

Process for preparing graphite particles purified surface from graphite particles behaving impurities, said process comprising at least one step of treating the expressed graphite particles, by means of a diluted aqueous solution of (H2SO4 and NH4F) in wherein the total content by weight of (H2SO4 and NH4F) represents between 5 and 30% of the total mass of the diluted aqueous solution and the quantity of diluted aqueous solution (H 2 SO 4 and NH 4F) used for treatment It represents between 70 and 95% by weight of the total mass of the graphite particles subjected to purification.