Carbon based electrodes

H - Electricity – 01 – M

Patent

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H01M 4/96 (2006.01) H01M 8/18 (2006.01)

Patent

CA 2332051

A carbon based electrode for the electrochemical reduction of sulfur or oxygen, which comprises an electrode core and, in electrical contact therewith, a structure comprising a porous particulate activated carbon bonded with a polymeric binder material, characterised in that the structure is at least 1 mm thick, in that the particulate activated carbon is prepared from a lignocellulosic material and has the following properties: i) a particle size in the range of from 200 to 850 µm; ii) a pore volume of from 0.45 to 1.0 cm3 per gram; iii) a surface area in the range of from 800 to 1500 m2/g; and in that the binder is used in an amount not exceeding 25 % by weight based upon the mixture of activated carbon and binder material.

L'invention concerne une électrode à base de carbone permettant la réduction électrochimique du soufre ou de l'oxygène, laquelle électrode comprend une âme et, au contact électrique de celle-ci, une structure comprenant du charbon actif poreux en particules lié à un liant polymère. L'électrode est caractérisée en ce que la structure a au moins une épaisseur de 1mm, en ce que le charbon actif en particules est préparé à partir d'un matériau lignocellulosique, et présente les propriétés ci-après : i) une granulométrie comprise entre 200 et 850 µm ; ii) un volume de pores compris entre 0,45 et 1,0 cm?3¿ par gramme ; iii) une aire comprise entre 800 et 1500 m?2¿/g ; et en ce que le liant est utilisé dans une quantité n'excédant pas 25 % en poids par rapport au mélange de charbon actif et de liant.

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