Electrode for an electrochemical cell, and an electrochemical cell
AssigneeSouth African Inventions Development Corporation
InventorJohan Coetzer
Life of this patent
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Abstract
An electrode for an electrochemical cell, the electrode comprising an electrochemically active substance selected from: (a) the group comprising or including the halogens, the alkali metals, the alkaline earth metals the first and second series of transition elements, lead, phosphorus, arsenic, antimony, bismuth, and aluminium; (b) an oxygen, sulphur or selenium composition; or (c) a composition containing carbon, baron, silicon or nitrogen with any of the substances of (a) or (b); and a zeolite molecular sieve carrier wherein the electrochemically active substance is sorbed and is held in dispersed form for effective use in a cell. An electrochemical cell including a pair of electrodes and an electrolyte, at least one electrode comprising an electrode as defined above.
Claims35
An electrochemical cell including a pair of compatible electrodes and a compatible electrolyte, at least one of the electrodes comprising an electrochemically active substance which comprises one or more elements selected from the group consisting of the halogens, the alkali metals, the alkaline earth metals, the first and second series of transition elements, lead, phosphorous, arsenic, antimony, bismuth and aluminium and a zeolite molecular sieve carrier having pore sizes of less than 100 Angtrom units wherein the electrochemically active substance is sorbed and is held in dispersed form in the cavities thereof for effective use in the cell, and the electrochemically active substance being such that any exchangeable cations of the zeolite molecular sieve carrier make a negligible contribution to the cell reaction, and substantially all the power and energy of the cell is provided by the eldctrochemically active substance held in dispersed form in the cavities in the carrier.
A composite electrode for an electrochemical cell, the composite electrode comprising an electrochemically active electrode and an active scavenger body electronically connected to the electrode for scavenging free electrochemical reaction products formed during use in a cell, the active scavenger body comprising a body of dehydrated zeolite crystals treated with an electron conductive material to make the active scavenger body electron conductive.
An electrochemical cell comprising a pair of compatible electrodes and an electrolyte, at least one of the electrodes being in the form of a composite electrode comprising an electrochemically active electrode and an active scavenger body electronically connected to the electrode for scavenging free electrochemical reaction products formed during use in the cell, the active scavenger body comprising a body of dehydrated zeolite crystals treated with an electron conductive material to make the active scavenger body electron conductive.
An electrochemicall cell including a pair of compatible electrodes and a compatible electrolyte, at least one of the electrodes comprising an electrochemically active substance which comprises a composition containing oxygen, sulphur or selenium, with the proviso that elemental sulphur;
- elemental selenium;
- elemental sulphur stabilized by having its vapour pressure lowered by its containing a minor proportion in relation to the sulphur of a stabilizing electronegative element comprising selenium, arsenic, phosphorous or antimony;
- and elemental selenium stabilized by having its vapour pressure lowered by its containing a minor proportion in relation to the selenium of a stabilizing electronegative element comprising sulphur, arsenic, phosphorous or antimony, are excluded, so that such sulphur and selenium in elemental or stabilized form are excluded as electrochemically active substances, and a zeolite molecular sieve carrier having pore sizes of less than 100 Angstrom units wherein the electrochemically active substance is sorbed and is held in dispersed form in the cavities thereof for effective use in the cell.
Dependencies are inferred from the claim text.