▎ 摘　　要

NOVELTY - Composite ionically-conductive material comprises: at least graphene-like graphite exfoliated from a graphite-based carbon material; and ionically-conductive material dispersed in a base material. The graphite-based carbon material has a rhombohedral graphite layer (3R) and a hexagonal graphite layer (2H). USE - The composite ionically-conductive material is useful in a power storage device, ionically-conductive dispersion and ionically-conductive solid composite (all claimed). ADVANTAGE - The composite ionically-conductive material: exhibits excellent conductivity; prevents electrification and static electricity; and intercepts electromagnetic waves. DETAILED DESCRIPTION - Composite conductive material comprises: at least graphene-like graphite exfoliated from a graphite-based carbon material; and conductive material dispersed in a base material. The graphite-based carbon material has a rhombohedral graphite layer (3R) and a hexagonal graphite layer (2H). The rate (3R) of the rhombohedral graphite layer (3R) and the hexagonal graphite layer (2H) based on an X-ray diffraction method defined by ratio of peak intensity (P3) of a plane of the rhombohedral graphite layer (3R) to the sum of P3 and peak intensity of a plane of the hexagonal graphite layer (2H)x 100 is 31% or more. The graphene-like graphite is a mixed material containing the graphite-based carbon material to graphene, produced by exfoliating a part or whole of the graphite-based carbon material. The graphene is a crystal of a mean size of 100 nm or more and formed in a flake-like or sheet-like shape having 10 layers or less. An INDEPENDENT CLAIM is also included for producing the composite ionically-conductive material comprising kneading at least a graphite-based carbon material and a conductive material into a base material.