Process for preparing electroactive materials for metal-ion batteries

Abstract

This invention relates a process for preparing composite particles. The process comprises a first step of providing a plurality of porous particles comprising micropores and/or mesopores, wherein the total pore volume of micropores and mesopores as measured by nitrogen gas adsorption is in the range from 0.4 to 2.2 cm3/g. The porous particles are contacted with a precursor of an electroactive material at a temperature effective to cause deposition of the electroactive material in the pores of the porous particles to form intermediate particles. Deposition of the electroactive material is discontinued and by-products are optionally separated from the intermediate particles. The intermediate particles are then contacted with a precursor of an electroactive material, at a temperature effective to cause further deposition of the electroactive material in the pores of the intermediate particles to form the composite particles. In at least one of the deposition steps, the reactor pressure is maintained at less than 200 kPa.

Dependencies are inferred from the claim text.