Graphene-enhanced anode particulates for lithium ion batteries

摘要

A nano graphene-enhanced particulate for use as a lithium-ion battery anode active material, wherein the particulate is formed of a single sheet of graphene or a plurality of graphene sheets and a plurality of fine anode active material particles with a size smaller than 10 μm. The graphene sheets and the particles are mutually bonded or agglomerated into the particulate with at least a graphene sheet embracing the anode active material particles. The amount of graphene is at least 0.01% by weight and the amount of the anode active material is at least 0.1% by weight, all based on the total weight of the particulate. A lithium-ion battery having an anode containing these graphene-enhanced particulates exhibits a stable charge and discharge cycling response, a high specific capacity per unit mass, a high first-cycle efficiency, a high capacity per electrode volume, and a long cycle life.

主权项

1. A lithium-ion battery anode comprising:
multiple nano graphene-enhanced particulates, wherein at least one of said particulate is formed of a single or a plurality of graphene sheets and a plurality of fine anode active material particles with a size smaller than 10 μm, and the graphene sheets and the particles are mutually bonded or agglomerated into said particulate with at least a graphene sheet embracing inside an envelope constituted by the graphene sheet or multiple graphene sheets said anode active material particles and said a single or plurality of graphene sheets, and wherein said graphene sheets are in an amount of at least 0.01% but less than 99% by weight and said anode active material is in an amount of at least 0.1% by weight, all based on the total weight of said particulate.