▎ 摘　　要

NOVELTY - Halogenated graphene nanoplatelets comprises graphene layers (i) that are free from any element or component other than sp2 carbon, and (ii) defect-free graphene layers, except for the carbon atoms forming the perimeters of the graphene layers of the nanoplatelets. The nanoplatelets comprises 5 wt.% or less halogen, preferably bromine. USE - Halogenated graphene nanoplatelets used in lithium ion battery, lithium sulfur battery, lithium air battery, lithium ion capacitor, supercapacitor, sodium ion battery, magnesium ion battery, thermoplastic or thermoset composition, lubricant composition, as carbocatalyst, in metal-free catalysis, in photocatalysis, as catalyst support (all claimed), and as alternative to carbon nanotubes. Uses include but are not limited to phones, automobiles, mass energy storage in power plants, as physical property enhancement additive, and for polishing and reducing asperities. ADVANTAGE - The halogenated graphene nanoplatelets exhibit improved conductivity, physical properties, and superior thermal stability, enhanced dissolvability in water, and are produced by the process, which is highly reproducible and deemed capable of being performed on a commercial scale. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) production of halogenated exfoliated graphite in the absence of water and oxygen, which includes (a) contacting a diatomic halogen selected from elemental bromine, elemental fluorine, iodine monochloride, iodine monobromide, and/or iodine monofluoride, with graphite flakes to form solids comprising halogen-intercalated graphite, and (b) feeding, into a reaction zone free from oxygen and water vapor, halogen-intercalated graphite while (a1) rapidly heating the halogen-intercalated graphite to, and maintaining the halogen-intercalated graphite at, a temperature of about 400 degrees C or above, and (b1) maintaining contact of the diatomic halogen chosen, with the halogen-intercalated graphite within the reaction zone, and withdrawing halogenated exfoliated graphite from the reaction zone, where the halogenated exfoliated graphite comprises 5 wt.% or less halogen, preferably bromine, and (c) optionally repeating steps (a) and (b) in sequence; and (2) energy storage device, which comprises an electrode comprised of halogenated graphene nanoplatelets.