A method for making an electrode for an ionic liquid-based supercapacitor comprising two electrodes (anode, cathode) separated by an ionic polymer electrolyte separator, comprising: - a step for making a carbon paste (6) resulting from mixing carbon materials (5), ionic liquids (2) and a binder (4), so as to obtain an active material (6) for said electrode at room temperature, - a step for forming said electrode (11) from mechanically processing said active material (6). A supercapacitor comprising a stack of a cathode electrode, an electrolyte separator and an anode electrode, said cathode and anode electrodes being electrically connected to current collectors, wherein said electrolyte separator comprises a polymer with an ionic liquid and said electrodes comprise a carbon-based active material mixed with an ionic liquid electrolyte and a binder.

Patent family WO2020260444

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