Method for recovering and electrolyzing zinc electrode of insert-block-type zinc air battery

Abstract

The invention discloses a method for recovering and electrolyzing a zinc electrode of an insert-block-type zinc air battery, which comprises the following steps of: (a) recovering the zinc electrode: a negative electrode of the insert-block-type battery after being discharged is taken out to obtain deactivated substances of the zinc electrode; (b) preparing special electrolyte; solid potassium hydroxide flake caustic soda with the purity more than 96% is adopted to prepare a potassium hydroxide solution with the concentration of 6 to 9mol / L, 30 to 40g of zinc oxide is added to the potassium hydroxide solution per liter, and the purity of the zinc oxide is more than 98%; and (c) inserting a cathode plate and an anode plate for electrolysis in the special electrolyte prepared in the step b,and putting the zinc electrode recovered in the step a in the electrolyte for the purpose of electrolytic preparation of zinc. According to the invention, electrolytic preparation of zinc by a wet method is preferably adopted, the current density is 100 to 150mA / cm<2>, the temperature ranges from 25DEG C to 50DEG C and zinc scraping is performed every 30 to 60min. In the method, the deactivated substances of the zinc electrode, obtained from battery recovery, are used as the raw material of electrolytic preparation of zinc so as to perform electrolysis, thus the step of recovering a negative alkali solution can be avoided and the consumption of the raw material can be reduced, and simultaneously, the novel negative plate updated and manufactured by the raw material has good electric conductivity, strong corrosive resistance and long service life.

Description

technical field [0001] The invention relates to a charging method for a zinc electrode of a block-type zinc-air battery, which belongs to the technical field of zinc-air batteries. Background technique [0002] Zinc-air batteries have been developed for a century since Maiche was first successfully produced in 1879. At present, this technology is still in continuous development. With the development of porous air electrodes and thin diffusion electrodes with polytetrafluoroethylene as binder, zinc The discharge current of the empty battery has been greatly improved, and the highest can reach 1000mA / cm 2 . After the 1980s, large-scale zinc-air batteries became the focus of research. After the 1990s, large-scale zinc-air batteries were widely used in electric vehicles, and they are expected to be used in household vehicles, thereby solving the problems of energy crisis and environmental degradation. [0003] The electrolysis and replacement of the negative electrode of zinc-...

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Problems solved by technology

[0003] The electrolysis and replacement of the negative electrode of zinc-air batteries has always been an important issue restricting the development of zinc-air batteries. However, the morphology of zinc powder produced by zinc smelting factories cannot meet the needs of current batteries, which makes the utilization rate of zinc after battery assembly Low, insufficient discharge, and at the same time, during the battery anode reduction process after the mechanical replacement of the plug-in battery, the battery needs to be disassembled, the negative electrode is cleaned, and then the current collector is removed to remove the inactivated negative electrode. Broken, heated and dissolved in the electrolyte before electrolysis can be carried out. This electrolysis method consumes a lot of alkali, and the washing process of zinc powder is complicated and time-consuming. It cannot keep up with the speed of battery replacement. After the process is improved

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