Multi-level graphene-protected anode active material particles for fast-charging lithium-ion batteries

摘要

Provided is graphene-embraced particulate for use as a lithium-ion battery anode active material, wherein the particulate comprises primary particle(s) of an anode active material and multiple sheets of a first graphene material overlapped together to embrace or encapsulate the primary particle(s) and wherein a single or a plurality of graphene-encapsulated primary particles, along with an optional conductive additive, are further embraced or encapsulated by multiple sheets of a second graphene material, wherein the first graphene and/or the second graphene material is attached to a redox partner species (e.g. sulfonyl group, —NH₂, etc.) capable of reversibly forming a redox pair with lithium. The invention also provides an anode electrode and a battery comprising multiple graphene-embraced particulates having redox forming species bonded thereto.