Composite conductive material, power storage device, conductive dispersion, conductive device, conductive composite and thermally conductive composite and met

摘要

A composite electrically-conductive material is disclosed which comprises a graphene material exfoliated from a graphite-based carbon material and the graphite-based carbon material, and an electrically-conductive material dispersed in a base material, where the graphite-based carbon material has rhombohedral graphite layer and a hexagonal graphite layer wherein a Rate, which is defined by Equation 1, is 31% or more: Rate = P3/ (P3+P4) x100 Equation 1 wherein P3 is a peak intensity of a (101) plane of the rhombohedral graphite layer based on the X-ray diffraction method, and P4 is a peak intensity of a (101) plane of the hexagonal graphite layer based on the X-ray diffraction method. The graphene material is a crystal of mean size of 100nm or more and formed in a flake-like or sheet-like shape having 10 layers or less. The graphite-based carbon material can be produced by carrying out radiowave and physical treatment on a natural graphite material. The composite may be formed by kneading the graphite-based carbon material together with the electrically-conductive material and the base material. The composite may be used as electrode materials, as an ink for coating substrates with a conductive material and electromagnetic shielding.