C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 31/04 (2006.01) H01M 4/58 (2006.01)
Patent
CA 2478428
The invention relates to a method of preparing surface-purified graphite particles from particles of an impure graphite. The inventive method comprises at least one step whereby the graphite particles are treated with a dilute aqueous solution of (H¿2?SO¿4? and NH¿4?F). According to the invention, the H¿2?SO¿4? and the NH¿4?F each have a weight content in the dilute aqueous solution of between 5 and 30 % of the total weight of said solution, while the quantity of the dilute aqueous solution represents between 70 and 95 % of the weight of the graphite particles to be purified.
Procédé de préparation de particules de graphite purifiées en surface ô partir de particules d'un graphite impur, ce procédé comporte au moins une étape de traitement des particules de graphite ô l'aide d'une solution aqueuse diluée de (H2SO4 et NH4F), H2SO4 et NH4F étant chacun présent dans la solution aqueuse diluée ô une teneur en poids représentant de 5 ô 30% de la masse totale de la solution aqueuse, la quantité de la solution aqueuse diluée représentant de 70 ô 95 % du poids des particules de graphite soumises ô purification.
Armand Michel
Gagnon Claude
Guerfi Abdelbast
Kinoshita Kimio
Zaghib Karim
Armand Michel
Hydro-Quebec
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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