▎ 摘　　要

NOVELTY - Electrochemically preparing graphene comprises e.g. (i) pressing the graphite material into graphite flakes through a sheeting device, where the graphite material comprises at least one of graphite paper, flake graphite, graphite powder or graphite foil, and the sheet thickness is 2-5 mm which is used as the electrolysis electrode reactant A and selecting ammonium salt as the electrolyte, preparing 0.1-3 mol/liter as ammonium salt solution B, adding the solution B further with aqeous ammonia, adjusting the pH of the solution B to 8-14, and mixing the mixed solution evenly to obtain an alkaline electrolyte solution C; and (ii) placing the electrolyte device in a constant temperature environment, using the graphite sheets as the electrode M and the electrode N to be electrolyzed, using the solution B as the electrolyte, transferring the electrode to alkaline electrolyte solution C, applying the alternative current voltage of the control time parameter as shown below to strip. USE - The method is useful for electrochemically preparing graphene. ADVANTAGE - The method: can produce graphene of different quality, accurately control the parameters of the alternating current thus achieves the intercalation and exfoliation of graphene; avoids the oxidation of graphene during the intercalation process; and utilizes readily and easily available chemical raw materials; and is convenient for industrialization. DETAILED DESCRIPTION - Electrochemically preparing graphene comprises (i) pressing the graphite material into graphite flakes through a sheeting device, where the graphite material comprises at least one of graphite paper, flake graphite, graphite powder or graphite foil, and the sheet thickness is 2-5 mm which is used as the electrolysis electrode reactant A and selecting ammonium salt as the electrolyte, preparing 0.1-3 mol/liter as ammonium salt solution B, where the ammonium salt comprises at least one of tetrabutylammonium hydrogen sulfate, tetrabutylammonium sulfate, tetraethylammonium hydrogensulfate or tetraethylammonium sulfate, adding the solution B further with aqeous ammonia, adjusting the pH of the solution B to 8-14, and mixing the mixed solution evenly to obtain an alkaline electrolyte solution C; and (ii) placing the electrolyte device in a constant temperature environment of 0-5 degrees C, in step (i), using the graphite sheets as the electrode M and the electrode N to be electrolyzed, using the solution B as the electrolyte, maintaining stably for 1-3 hours under a direct current voltage of 2.5-3.5 V, transferring the electrode to alkaline electrolyte solution C, applying the alternative current voltage of the control time parameter as shown below to strip, stabilizing it at 5-15 V and energizing continue according to the set parameters for 0.5-2 hours to obtain a precipitate at the bottom of solution C, where AC voltage control parameters given as specified, name the two electrodes electrode M and electrode N, applying voltage on the two electrodes according to the following parameters as specified, where the time ratio of stage one to stage two, stage three to stage four, stage six to stage five and stage eight to stage seven is 1:1-60:1, preferably 4:1-30:1, more preferably 10:1-20:1 to obtain a precipitate at the bottom of solution C.An INDEPENDENT CLAIM is also included for a graphene prepared as mentioned above, preferably obtained graphene is not graphene oxide but graphene with a low degree of oxidation, and oxygen content and the ratio of oxygen element to the total mass of graphene does not exceed 10% with a larger size without less than 3 mu m and the number of layers is less than 8.