Silicon-carbon composite particulate material
AssigneesCommissariat A L'energie Atomique Et Aux Energies Alternatives, Umicore AG & Co. KG
InventorsJean-Sebastien Bridel, Tim Van Rompaey, Vincent Caldeira, Agnes Brun, Jean-Francois Colin, Cedric Haon
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Abstract
The present invention relates to an electrochemically active Si-carbon composite particulate material, wherein silicon nanoparticles are entrapped in a carbon matrix material based on at least micronic graphite particles, reduced graphene platelets and amorphous carbon.
Claims14
An electrochemically active Si-carbon composite particulate material, wherein silicon nanoparticles are entrapped in a carbon matrix material, the carbon matrix material comprising:
- micronic graphite particles,
- reduced graphene platelets and
- amorphous carbon, wherein:
- the electrochemically active Si-carbon composite particulate material comprise particles having a distribution of size with 1 μm<D10<80 μm, 5 μm<D50<300 μm and 10 μm<D90<700 μm and a BET ranging from 2 to less than 26.7 m2/g;
- the micronic graphite particles and reduced graphene platelets in a weight ratio graphite/graphene from 1.7 to 14;
- and
- the electrochemically active Si-carbon composite particulate material comprises Si ranging from 13 to 30% by weight of its total weight.
A method for forming an electrochemically active material using of a Si-carbon composite particulate material comprising:
- (i) providing Si nanoparticles under a non-agglomerated form,
- (ii) contracting said Si nanoparticles with a solution containing at least one carbon-containing organic compound, and a dispersion of micronic graphite particles and of reduced graphene or graphene oxide platelets,
- (iii) drying the mixture of the previous step (ii) for forming a particulate material, which particles contain Si nanoparticles, micronic graphite particles, reduced graphene or graphene oxide platelets, and the carbon-containing organic compound, and
- (iv) thermally treating the particulate material of step (iii) so that the carbon-containing organic compound decomposes and graphene oxide, if present, reduces thereby obtaining a Si-carbon composite particulate material having silicon nanoparticles entrapped in a carbon matrix material based on at least micronic graphite particles, reduced graphene platelets and amorphous carbon, the Si-carbon composite particulate material comprising particles having a distribution of size with 1 μm<D10<80 μm, 5 μm<D50<300 μm and 10 μm<D90<700 μm and a BET ranging from 2 to less than 26.7 m2/g;
- the micronic graphite particles and reduced graphene platelets in a weight ratio graphite/graphene from 1.7 to 14;
- and the electrochemically active Si-carbon composite particulate material comprises Si ranging from 13 to 30% be weight of its total weight.
Dependencies are inferred from the claim text.