▎ 摘　　要

NOVELTY - Method for manufacturing graphene, involves forming graphite oxide from graphite, subjecting the graphite oxide to hydrochloric acid treatment, and subjecting the graphite oxide that has been subjected to the hydrochloric acid treatment, to heat treatment at 120-200 degrees C to reduce the graphite oxide. USE - The method is useful for manufacturing graphene preferably porous graphene, which is used as anode material in lithium secondary battery. ADVANTAGE - The method is highly economical and widely useable due to low temperature process for manufacturing graphene by performing heat treatment at relatively low temperature during short time. The method enables mass production of the graphene with low unit price due to simple synthesis process and low heat treatment temperature. The lithium secondary battery containing the graphene as an anode material has high capacity, by reacting lithium at high voltage of 2 V or more, when compared to existing cathode material used in the lithium secondary battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for graphene obtained by the above-mentioned method.