Importance

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Abstract

A process is provided for preparing a particulate material consisting of a plurality of porous particles comprising an electroactive material selected from silicon, tin, germanium, aluminium or a mixture thereof, wherein the particles are assembled from a plurality of particle fragments comprising the electroactive material wherein the fragments are obtained by the fragmentation of a porous precursor. The fragmentation step may be realized e.g. by wet ball milling and the later assembling step is preferably realized by spray-drying. Also provided are particulate materials obtainable according to the process of the invention, compositions comprising the particulate materials, and electrodes and electrochemical cells comprising the particulate materials. The materials and compositions are especially useful as anode materials in the context of a metal-ion battery such as a lithium-ion battery.

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First Claim