▎ 摘　　要

NOVELTY - High-expansion volume graphene aggregate is claimed. The expansion volume of high-expansion volume graphene aggregate is not less than 450 ml/g (preferably 550-600 ml/g). USE - The aggregate is useful as conductive material, cathode material or anode material in lithium ion battery (claimed). ADVANTAGE - The aggregate has low emission of harmful substances. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing high-expansion volume graphene aggregate comprising carrying out oxidation reaction of layered graphite and oxidant in presence of intercalating agent to obtain expandable graphite, then subjecting expandable graphite to high temperature treatment to strip the expandable graphite into graphene to obtain high-expansion volume graphene aggregate, where intercalant is mixture of strong acid and organic acid, strong acid is bromic acid and/or iodic acid, and organic acid is formic acid, acetic acid or oxalic acid; and (2) high-expansion volume graphene aggregate is obtained by above method.