▎ 摘　　要

NOVELTY - Producing colloidal graphene dispersions or multi-graphene dispersions comprises: (a) dispersing graphite oxide in a dispersion medium to form a colloidal graphene oxide dispersion or a multi-graphene oxide dispersion; and (b) thermally reducing the graphene oxide or multi-graphene oxide in dispersion. USE - The method is useful for producing colloidal graphene dispersion or multi-graphene dispersion, and graphene or multi-graphene layer or multi-graphene particles, where the: colloidal graphene dispersion is useful for providing nanoparticles with an electronically conducting coating having a C/O ratio of at least 13.5; and multi-graphene (including multi-graphene with low C/O ratio) is useful as electrode material in rechargeable lithium ion batteries (all claimed). ADVANTAGE - The method: provides colloidal graphene dispersion or multi-graphene dispersions having high stability with improved intercalating features, thus making them suitable in the production of electrodes in rechargeable lithium ion batteries; and allows the production graphene layers in high yields without the need of additives or reducing agents. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) producing a graphene or multi-graphene layer or multi-graphene particles comprising steps (a), (b) as above per se, and either depositing on a substrate or precipitating the dispersion of step (a) and then performing step (b), or depositing on a substrate or precipitating the dispersion of step (b); (2) the colloidal graphene dispersion obtained by the method; (3) a multi-graphene dispersion or isolated multi-graphene with an inter-planar distance in the multi-graphene of greater than 3.35 Angstrom , preferably greater than 3.6 Angstrom ; (4) generating electronically conducting nanoparticles comprising coating nanoparticles with the graphene dispersion or graphene oxide dispersion and then thermally reducing the coated particles in dispersion to get nanoparticles coated with graphene/multi-graphene of a C/O ratio of at least 13.5; and (5) preparing an electrode for rechargeable lithium ion batteries, comprising providing the multi-graphene and coating a conductor with the multi-graphene, optionally in the presence of a binder.