Preparation method of electrode membrane used for Li-ion capacitor

The invention relates to a preparation method of an electrode membrane used for a Li-ion capacitor. The invention belongs to the technical field of the Li-ion capacitors. The preparation method of the electrode membrane used for the Li-ion capacitor is characterized in that the preparation process comprises the steps of: mixing functionalized grapheme and an olivine structure anode material to be an electrode material, and then mixing the electrode material and a conductive agent with glue, finally pressing the membrane to obtain the electrode membrane. By adding the functionalized grapheme material, the electrode has relatively good power performance and energy density, and after the anode material is mixed, the energy density of the electrode is further improved; and compared with other general capacitors, the Li-ion capacitor has a great energy density advantage.