The dynamic growth of mobile technologies is a driving need for portable power sources. The most popular division of electrochemical cells relies on the type of chemical reaction within the cell. Current data coming from the Polish market show that despite the growth in the sale of secondary power sources, zinc-carbon and alkaline batteries are still the most popular. The results of non-reductive acidic leaching of zinc and manganese from the waste batteries stream have been presented. Manganese was leached with almost 100% yield in an experiment with a solid to liquid ratio equal to 4/1, pH of 1.04, and H2SO4 concentration of 72.5 wt. %. High yields were also obtained for zinc recovery from the waste stream (100% for two series with solid to liquid ratio 4/5, pH of 0.80; H2SO4concentration of 37.2 wt. %, and solid to liquid ratio 1/2; pH of 1.01; H2SO4 concentration of 27.3 wt. %). Besides, the quantitative and qualitative analysis of Zn-C and Zn-Mn batteries introduced to the Polish market and waste generated in the years 2010-2018 has been presented.
The studies were focused on paste-type nickel cathodes produced with foam nickel as a carrier. The influence of the following additives on the electrochemical behavior of the paste-type cathodes was analyzed: cobalt powder, cobalt oxide, barium hydroxide and calcium hydroxide.
The electrochemical performance of nickel foam, sintered nickel and nickel deposited on Reticulated Vitreous Carbon (RVCŽ) in KOH solutions has been investigated. The results indicate that the foam nickel is a very good carrier for redox couple Ni(OH)2/NiOOH which is used in alkaline rechargeable batteries as an electrode material. Also RVC covered with nickel is a good matrix for nickel hydroxide and it can be used as a positive electrode in secondary alkaline batteries. Foam nickel saturated with Ni(OH)2 has the best weight capacities in comparison to sintered nickel and nickel deposited on RVC. Sintered nickel saturated with Ni(OH)2 has the best volume capacity. However, Ni/RVC-NiOOH electrode has much better weight specific energy than that typical for sintered nickel saturated with NiOOH. The influence of additives (derivatives of cellulose) on sizes of pores and their distribution in sintered nickel and power capacity of positive electrode has been also studied.
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