Surface purification of natural graphite and effect of...

C - Chemistry – Metallurgy – 01 – B

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C01B 31/04 (2006.01) H01M 4/58 (2006.01)

Patent

CA 2399252

The invention concerns the physical or chemical purification of natural graphite ore. Said purification is preferably applied to the surface of natural graphite to enable the formation of a passivation film during the first discharge or parting of lithium in the graphite when the latter is used in a lithium-ion cell. Grinding to a small size before purification enables to optimise particle distribution, resulting in a more homogeneous electrode. Said grinding is carried out in the presence of natural graphite impurities which act as micro-abrasive and provide the graphite with hardness thereby enhancing its mechanical properties.

La présente invention concerne la purification physique ou chimique spécifique du minerai du graphite naturel. Cette purification est appliquée de préférence à la surface du graphite naturel pour permettre la formation d'un film de passivation lors de la première décharge ou l'intercalation du lithium dans le graphite lorsque ce dernier est utilisé dans une pile lithium-ion. Le broyage à une petite taille avant la purification permet l'optimisation de la distribution des particules, donnant lieu à une électrode beaucoup plus homogène. Ce broyage se fait en présence des impuretés naturelles du graphite qui jouent le rôle de micro-abrasif et donne une dureté au graphite qui fait augmenter ses propriétés mécaniques.

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