Stable dispersions of single and multiple graphene layers in solution
AssigneeBelenos Clean Power Holding AG
InventorsReinhard Nesper, Kaspar Tommy
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Abstract
Disclosed is a method for producing colloidal graphene dispersions comprising the steps of (i) dispersing graphite oxide in a dispersion medium to form a colloidal graphene oxide or multi-graphene oxide dispersion (ii) thermally reducing the graphene oxide or multi-graphene oxide in dispersion. Dependent on the method used for the preparation of the starting dispersion a graphene or a multi-graphene dispersion is obtained that can be further processed to multi-graphene with larger inter-planar distances than graphite. Such dispersions and multi-graphenes are for example suitable materials in the manufacturing of rechargeable lithium ion batteries.
Claims41
A method for producing colloidal graphene dispersions or multi-graphene dispersions, the method comprising the steps of:
- (i) dispersing graphite oxide in a dispersion medium to form a colloidal graphene oxide dispersion or a multi-graphene oxide dispersion;
- and
- (ii) thermally reducing the graphene oxide or multi-graphene oxide in dispersion to form a colloidal graphene dispersion or a multi-graphene dispersion.
17-19. (canceled)
A method for preparing an electrode for rechargeable lithium ion batteries using the multi-graphene layers according to claim 39, the method comprising the steps of:
- (c-1) providing the multi-graphene layers, wherein the multi-graphene layers have low C/O ratio of at most 13;
- and
- (c-2) coating a conductor with said multi-graphene layers, optionally, in the presence of a binder.
Dependencies are inferred from the claim text.