Process of manufacturing sintered carrier type negative electrodes for alkaline storage cells

Abstract

Abstract A METHOD OF PREPARING NEGATIVE ELECTRODES FOR ALKALINE STORAGE CELLS BY INCORPORATING ACTIVE ELECTRODE MATERIAL INTO POROUS METAL CARRIERS, FOR EXAMPLE, FOR SINTERED NICKEL BY IMPREGNATING THE CARRIER WITH AN ACIDIFIED CADMIUM SALT SOLUTION, THEN PRECIPITATING CADMIUM HYDROXIDE AND INCIDENTALLY NICKEL HYDROXIDE IN ITS PORES BY IMMERSION IN AN ALKALI METAL SOLUTION, THEN WASHING AND DRYING THE PRECIPITATE BEARING CARRIER, THEREAFTER HEATING SUCH CARRIER AT TEMPERATURES RANGING FROM 200 TO 500*C. IN AIR OR INERT ATMOSPHERE FOR A SELECTED PERIOD OF TIME TO CONVERT THE NICKEL AND CADMIUM HYDROXIDES INTO RESPECTIVE OXIDES, THEREAFTER REHYDRATING THE HEATED OXIDE BEARING CARRIER BY IMMERSION IN AN AQUEOUS LIQUID SUCH AS WATER OR AN AQUEOUS SOLUTION OF A NICKEL SALT OR AN ALKALI METAL HYDROXIDE MAINTAINED AT A TEMPERATURE OF APPROXIMATELY 80*C. FOR APPROXIMATELY 1 TO 2 HOURS. THIS CONVERTS THE CADMIUM OXIDE TO CADMIUM HYDROXIDE WITHOUT SUBSTANTIALLY AFFECTING THE NICKEL OXIDE. SUBSEQUENTLY WASHING THE SO-TREATED CARRIER BEARING CADMIUM HYDROXIDE AND SUCH NICKEL OXIDE AND FINALLY WASHING AND FINALLY DRYING THE ELECTRODE PREFERABLY IN CARBONATED AIR. THE RESULTANT NEGATIVE ELECTRODE HAS A MATERIALLY REDUCED AMOUNT OF DELETERIOUS OR PARASITIC POSITIVE ACTIVE MATERIAL AND INCREASED POROSITY AND FLEXIBILITY AS COMPARED WITH LIKE NEGATIVE ELECTRODES PRODUCED BY CONVENTIONAL CARRIER IMPREGNATING AND PRECIPATING PROCEDURE. NEGATIVE ELECTORDES RESULTING FROM THE PROCESS OF THIS INVENTION AND ALKALINE STORAGE CELLS WITH SUCH NEGATIVE ELECTRODES ARE ALSO DISCLOSED.

Inventors

• 👤 Emile Jean Lucien Pinard

Bibliographic Details