Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Reexamination Certificate
2011-08-09
2011-08-09
Hendrickson, Stuart (Department: 1736)
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
C423S461000
Reexamination Certificate
active
07993621
ABSTRACT:
The present invention relates to the physical or chemical specific purification of natural mineral graphite. This purification is preferably applied to the surface of natural graphite in order to allow the formation of a passivation film during the first electrical discharge or the insertion of lithium in the graphite when the latter is used in a lithium-ion cell. The grinding to a small size before purification allows the optimization of the distribution of the particles, resulting in a more uniform electrode. This grinding is carried out in the presence of the natural impurities of the graphite that play the role of a micro-abrasive and result in a hardness of the graphite that increases its mechanical properties.
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Armand Michel
Brochu Fernand
Gauthier Michel
Guerfi Abdelbast
Massé Monique
Buchanan & Ingersoll & Rooney PC
Hendrickson Stuart
Hydro-Quebec
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