Typical applications are hearing aids and safety

July 09 [Tue], 2013, 11:28
Zinc-air batteries generate electrical power by an oxidation process of zinc and oxygen from the air. The cell can produce 1.65V, but 1.4V and lower achieves a longer lifetime. Removing a sealing tab activates the A1322 laptop battery by enabling airflow and the battery reaches full operating voltage within five seconds. Once turned on, the battery cannot be stopped. Inhibiting airflow by adding a tape only slows degeneration.

Zinc-air batteries have similarities to the proton exchange membrane fuel cell (PEMFC) by using oxygen in the air as fuel for the positive electrode. Air can, to a certain extent, control the rate of the reaction. Zinc-air is considered a primary battery; however, there are recharging versions for high-power applications. Recharging occurs by replacing the spent zinc electrodes, which can be in the form of a zinc electrolyte paste. A different type of zinc-air battery uses zinc pellets. Rechargeable zinc-air A1189 laptop battery have been tried on electric vehicles and discontinued.

At 300–400Wh/kg, zinc-air has a high specific energy, manufacturing cost is moderate, but the specific power (current handling) is low. In a sealed state, the self-discharge is two percent per year. Zinc-air is sensitive to extreme temperatures and high humidity. Pollution also affects performance; high ambient carbon dioxide reduces the performance by increasing the internal resistance. Typical applications are hearing aids and safety lamps at construction sites.
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