Electrodes for galvanic elements
AssigneeDeutsche Automobilgesellschaft mbH
InventorsGabor Benczur-Urmossy, Ute Baumeyer
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Abstract
Electrodes for galvanic elements which contain an active mass and an electrocatalyst, an organic binding agent and a conductive substance which also contributes simultaneously to the mechanical rigidity; as conductive substance is used the voluminous material obtained by thermal decomposition of nickel- or/and iron-carbonyl in the presence of an inert gas that is not preheated.
Claims27
In a electrode for galvanic elements including one of an active mass and an electrocatalyst, an organic binding agent, and a conductive substance. the improvement wherein said conductive substance is a comminuted form of a moss-like material of fiber-shaped crystal aggregates obtained by thermal decomposition of a gaseous carbonyl selected from the group consisting of nickel carbonyl, iron carbonyl and mixtures thereof in the presence of a non-preheated inert gas in a decomposition zone heated to about 300.degree. to 500.degree. C., the gaseous carbonyl being mixed with said inert gas at a ratio of 1:1 to about 1:100.
A loosely cohesive, voluminous, moss-like material of fiber-shaped crystal aggregates formed by thermally decomposing a carbonyl gas selected from the group consisting of nickel carbonyl, iron carbonyl and mixtures thereof in an admixture with a non-preheated inert gas at atmospheric pressure and at a temperature of at least about 300.degree. C.
In a electrode for galvanic elements including one of an active mass and an electrode catalyst, an organic binding agent and a conductive substance, the improvement wherein said conductive substance is obtained by passing a mixture of an unpreheated inert gas and a metal carbonyl gas selected from the group consisting of nickel carbonyl, iron carbonyl and mixtures thereof at atmospheric pressure through a reaction vessel heated to a decomposition temperature of at least about 300.degree. C. so that a decomposition product of said metal carbonyl comprising a loosely cohesive, large-volume, moss-like material of fiber-shaped crystal aggregates is formed on the walls of said reaction vessel, recovering said decomposition product from said reaction vessel, and comminuting said decomposition product to form particles having particle sizes of less than 1 mm.
A method for producing a conductive substance for use in electrodes for galvanic elements, comprising the steps of evaporating a material selected from the group consisting of nickel carbonyl, iron carbonyl and mixtures thereof to produce a carbonyl gas, mixing the carbonyl gas obtained thereby with an inert gas having undergone no preheating when mixed with said carbonyl gas, and causing the gas mixture to undergo thermal decomposition by conducting the gas mixture at atmospheric pressure to a decomposition zone heated to the decomposition temperature of said carbonyl gas whereby the growth of crystals one upon the other into a voluminous product comprising a moss-like material of fiber-shaped crystal aggregates is attained and thereafter comminuting the voluminous product obtained from the decomposition zone into particle size smaller than 1 mm.
Dependencies are inferred from the claim text.