An aqueous electrolyte mixture for mcfcs

H - Electricity – 01 – M

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H01M 8/14 (2006.01)

Patent

CA 2561902

The present invention relates to an electrolytic mixture for molten carbonate fuel cells (MCFCs). The carrier solution is constituted by one or more organic solvents and water, with an organic solvent percentage comprised of between 5% and 80%. The electrolyte consists of a mixture of Li2CO3 and LiKCO3 in such stoichiometric ratios as to give the Li2CO3/K2CO3 62/38 eutectic mixture. The compound LiKCO3 has a solubility in water, like lithium carbonate, less than that of the potassium carbonate, which is normally found in MCFC electrolytic mixtures. This allows the resolution of the problem of electrolyte loss during the operation of the cell, due to the solubilisation of the same in water.

La présente invention concerne un mélange électrolytique destiné à des piles à combustible à carbonate fondu (MCFC). La solution du porteur est constituée par un ou plusieurs solvants organiques et de l'eau, avec un pourcentage de solvant organique compris entre le 5 % et 80 %. L'électrolytique est constitué d'un mélange de Li¿2?CO¿3? et de LiKCO¿3? dans des rapports stoechiométriques permettant d'obtenir le mélange eutectique Li¿2?CO¿3?/K¿2?CO¿3? 62/38. Le composé LiKCO¿3? possède une solubilité dans l'eau, comme le carbonate de lithium, inférieure à celle du carbonate de potassium, qu'on trouve habituellement dans des mélanges électrolytiques MCFC. Ceci permet de résoudre le problème de pertes d'électrolyte pendant le fonctionnement de la pile, dû à la solubilisation de celui-ci dans l'eau.

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