Herstellung und Regenerierung von Schlämmen für die Anwendung in Zinkluftbatterien

摘要

An at least partially spent Zn-alkali slurry for use in zinc-air batteries is, after optional dilution with aqueous Group Ia metal hydroxide(s) and water, regenerated by: (i) optionally separating the dissolved and undissolved phases; (ii) electrolyzing the at least partially spent slurry and/or the separated dissolved phase from step (i), in a cell with a corrosion-resistant anode and a non-Zn-adherent cathode such that the Zn which deposits thereon self-detaches or is removable by a method selected from brushing, scraping, vibrating and the use of liquid jets, until no more than a preselected amount of Zn remains in the solution, the current density at the cathode being preselected so that in conjunction with the non-Zn-adherent characteristic of the cathode, the electrowon Zn will have, after consolidating into particles, a density of 0.2-2.0 g./cc and a surface area of 0.5-6.0 m<2>/g.; (iii) removing Zn from the cathode and consolidating it into particles; (iv) combining Zn from step (iii) with additional aqueous Group Ia metal hydroxide, and if desired other makeup components such as the optionally separated undissolved phase from step (i), thereby reconstituting charged slurry; (v) optionally analyzing the reconstituted slurry from step (iv) in order to ascertain whether at least the amounts of Zn (and of other constituents of the slurry) and the amount and concentration of the Group Ia metal hydroxide(s), lie within predetermined limits; (vi) optionally adjusting the amounts of reconstituted slurry ingredients. The invention includes also a similar process for the preparation of a Zn-alkali slurry for use in batteries comprising particulate zinc.