Potato-shaped graphite particles with low impurity rate at the surface, method for preparing the same

摘要

Modified graphite particles obtained from graphite or based on graphite, the said particles having impurities in their internal structure and having on the surface a low, even nil, rate of an impurity or several impurities. In addition, these particles have at least one of the following characteristics:
a tab density between 0.3 and 1.5 g/cc;a potatolike shape; anda granulometric dispersion such that the D90/D10 ratio varies between 2 and 5 and the particles have a size between 1 and 50 μm.;These particles can be used for fuel cells, electrochemical generators, or as moisture absorbers and/or oxygen absorbers and they have important electrochemical properties. The electrochemical cells and batteries thus obtained are stable and safe.

主权项

1. A process for preparing modified graphite-based particles comprising:
coating a surface of prismatic-shaped graphite-based particles with a metallic deposit or with a metallic and carbonic deposit while keeping a basal function (fb) and an edge function (fe) of the prismatic-shaped graphite-based particles constant, wherein the coating of the surface of the prismatic-shaped graphite-based particles results in a sphericity of 80% or more.