Zinc-Air Batteries | EcoGeek - Clean Technology: "Zinc air batteries are already used in hearing aids, though companies like Power Air hope to build batteries more suited for power and charging mobile electronic devices. Toyota is even researching ways to use zinc-air cells in electric vehicles, though they have put a 2020 timeline on the project, which means we won’t be seeing it any time soon.
As far as the chemistry goes, using zinc is no different than any other fuel cell, or regular battery for that matter (zinc, in fact, is a major component of most alkaline batteries). So what’s so special about it? It has two big advantages over something like lithium. Firstly, it is abundant and cheap, whereas there are fears about the supply of lithium. Secondly, it is safe and recyclable. It also has a relatively high energy density (energy contained per unit of volume)."
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