MANUFACTURE OF HYDROGEN ABSORBING ELECTRODE AND METAL OXIDE-HYDROGEN STORAGE BATTERY WITH HYDROGEN ABSORBING ELECTRODE

摘要

PURPOSE:To provide a metal oxide-hydrogen storage battery having high energy density and a long life by immersing an alloy sheet consisting of a hydrogen absorbing alloy powder and fluororesin in an alkali aqueous solution and then composing an electrode by press-uniting the sheet with an electric collector. CONSTITUTION:A MmNi4.0Mn0.3Al0.3Co0.4 alloy is prepared by, for example, mixing together Mm containing highly pure La, Ni, Mn, Al, and Co at prescribed ratios and melting them in an arc melting furnace. The resulting product is pulverized to form powder and a proper amount of PTFE(polytetrafluoroethylene), carbon fine powder, or CMC(carboxymethyl cellulose) are added to the powder to make alloy sheets 1a, 1b with different compositions. After the sheets are immersed in potassium hydroxide aqueous solution for 12 hours, the sheets are washed with water, dried, press-united with an electric collector 3 by a roller pressing method to produce a sheet-type electrode in which a lead 2 is attached to the collector. The resulting body is inserted in a bag-like separator, combined with a nickel-based positive pole to form a group of electrodes and using a potassium hydroxide aqueous solution as an electrolytic solution, a nickel-hydrogen storage battery is prepared.