Sgl Carbon Se

Centre National De La Recherche Scientifique

L'universite D'orleans

Université D'orleans

Martin Cadek

Encarnacion Raymundo-Pinero

Francois Beguin

Mario Wachtler

Wilhelm Frohs

A composite suitable as a charge-storing material for electrochemical capacitors contains carbon nanotubes and a carbonaceous materiel. The carbonaceous material is the carbonization residue of a biopolymer or seaweed rich in heteroatoms. Wherein the carbonization residue of the biopolymer or seaweed is electrically conductive and has a heteroatom content as detected by XPS of at least 6%.

Composite containing carbonized biopolymers and carbon nanotubes and method of making the composite

In a method of manufacturing a porous coke suitable as a charge-storing material in electrochemical capacitors, one manufactures or provides a non-calcined isotropic coke with spherical or onion-shaped morphology and low graphitizability as a starting material. The starting material is comingled with a caustic alkali to obtain a homogenous mixture. The homogenous mixture is heat treated at a temperature in a range between 650 and 950&#xb0; C. to obtain the porous coke. The porous coke is washed and neutralized.

Porous coke and method of producing the porous coke

A carbon material suitable for the preparation of electrodes for electrochemical capacitors is obtained by single-stage carbonization of biopolymers with a large content of heteroatoms. Neither addition of an activating agent during carbonization nor subsequent gas phase activation is necessary. Several biopolymers which are available by extraction from seaweed are suitable precursors. Alternatively, the seaweed containing such biopolymers is carbonized directly.

Electrochemical capacitor, carbonized biopolymers and carbonization process

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Augsburg, Germany

Martin Cadek