Patent ID: 7588826

Claim:
Process for preparing a homogenous mixture of coated particles containing a graphite based conductive nucleus and at least two partial or complete coating of the surface of said nucleus, the coating comprising a first interactive functional agent, the first interactive functional agent consisting of a material that differs in composition and/or in physical shape from the material that constitute the nucleus of the coated particles, said process including at least one step of crushing particles of the graphite nucleus together with particles of the first interactive functional agent, the particles of graphite having an average size X and those of the first interactive functional agent having an average size Y such that the ratio Y/X is smaller than 1, and said process further comprising a second crushing step, wherein the coating particles obtained in the first crushing step are subjected to a second crushing in the presence of a second interactive functional agent that is identical or different from the first interactive functional agent used in the first crushing step, the average size of the particles of the second interactive functional agent being smaller than the size of the coated particles obtained in the first crushing step.