Novel sulphur-modified monolithic porous carbon-based material process for the preparation thereof and uses thereof in the storage and release of energy

Process for the preparation of a sulphur-modified monolithic porous carbon-based material, characterized in that it comprises at least the following stages:

• (i) the drying of a gel comprising at least one hydrophilic polymer of polyhydroxybenzene/formaldehyde type,
• (ii) the pyrolysis of the material obtained during stage (i),
• (iii) the impregnation of the material resulting from stage (ii) with a strong sulphur-based acid,
• (iv) the heat treatment at a temperature of between 300 and 500° C., preferably between 350 and 500° C., and more preferably still between 300 and 400° C., of the sulphur-modified material obtained at the end of stage (iii),
• the said process not comprising a hydrogenation stage.