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OwnerDavid Ayme-Perrot, Marie Dieudonne +2inventors
InventorsDavid Ayme-Perrot, Marie Dieudonne, Philippe Sonntag, Anne-Caroline Pasquier
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A subject-matter of the invention is a novel process for the preparation of sulphur-modified monolithic porous carbon-based materials by impregnation with a strong sulphur-based acid, the materials capable of being obtained according to this process and the use of these materials with improved supercapacitance properties to produce electrodes intended for energy storage systems. Electrodes composed of sulphur-modified monolithic porous carbon-based materials according to the invention and lithium batteries and supercapacitors having such electrodes also form part of the invention.
A sulphur-modified monolithic porous carbon-based material obtained according to a process comprising at least the following stages:
An electrode comprising a sulphur-modified monolithic porous carbon-based material having a surface atomic percentage of sulphur varying from 0.01 to 0.5%, and exhibiting a density of between 0.5 and 1.3.
A sulphur modified carbon-based material comprising a carbon monolith and having a network of pores in which at least 10% of the pores have a diameter between 2 and 50 nm, and wherein the material comprises a surface atomic percentage of sulphur varying from 0.01 to 0.5%, a density of between 0.5 and 1.3, and a mean full capacitance by weight of greater than or equal to 140 F/g, measured in a 1M aqueous H2SO4 solution, or of greater than or equal to 120 F/g, measured in a 6M aqueous KOH solution.
Dependencies are inferred from the claim text.