▎ 摘　　要

NOVELTY - Graphene is prepared by pressing graphite on stainless steel current collector to obtain working electrode of 3-electrode system (110), preparing intercalated graphite using the 3-electrode system (120), washing intercalated graphite with deionized water (130), vacuum-drying (140), soaking (150) dried intercalated graphite in low temperature liquefied gas, heat-stripping, and cooling (160) in oxygen-free environment. USE - Preparation of graphene (claimed). ADVANTAGE - Preparation method of graphene is performed at low temperature for a short reaction time with high efficiency, high yield, and low cost without using toxic chemical reagents, and the prepared graphene has high electrical conductivity. DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram of the preparation method of graphene. (Drawing includes non-English language text). Preparation of working electrode of 3-electrode system (110) Preparation of intercalated graphite (120) Deionized water washing (130) Vacuum-drying process (140) Soaking in low temperature liquefied gas (150) Cooling (160)