Potato-shaped graphite particles with low impurity rate at...

Details Potato-shaped graphite particles with low impurity rate at... Potato-shaped graphite particles with low impurity rate at...

C - Chemistry, Metallurgy

01

B

C01B 31/04 (2006.01) H01M 4/02 (2006.01) H01M 4/58 (2006.01)

Patent

CA 2422660

The invention concerns modified graphite particles obtained from graphite or based on graphite, said particles having impurities in their internal structure and having, at the surface, a low, even nil, rate of an impurity or several impurities. Said particles further comprise at least one of the following characteristics: a tab density ranging between 0.3 and 1.5 g/cc; the shape of a potato; and a size distribution such that the D90/D10 ratio varies between 2 and 5 and the particles have a size ranging between 1 and 50 µm. Said particles are useful for fuel cells, electrochemical generators or moisture sensor and/or oxygen sensor and they have interesting electrochemical properties. The resulting electrochemical cells and batteries are stable and safe.

Particules de graphite modifié obtenues à partir de graphite ou à base de graphite, les dites particules possédant des impuretés dans leur structure interne et possédant, en surface, un taux faible voir nul d'une ou de plusieurs impuretés. Ces particules possèdent en outre au moins une des caractéristiques suivantes: une densité tab comprise entre 0,3 et 1,5 g/cc; la forme d'un patatoïde; et une dispersion granulométrique telle que le rapport D90/D10 varie entre 2 et 5 et les particules ont une taille comprise entre 1 et 50 µm. Ces particules sont utilisables pour les piles à combustible, générateur électrochimiques ou comme capteur d'humidité et/ou comme capteur d'oxygène et elles possèdent des propriétés électrochimiques intéressantes. Les piles électrochimiques et batteries ainsi obtenus sont stables et sécuritaires.

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