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Jotakin etuja ja kohtia, joita kaiketi voidaan saada parannettua
http://www.mpoweruk.com/zinc_air.htmAdvantagesHigh energy density but low power
Inexpensive materials
The zinc-air system, when sealed, has excellent shelf life, with a self-discharge rate of only 2 percent per year.
In relation to their physical size, Zinc/Air batteries store more energy per unit of weight (in terms of 220 Wh/kg) than almost any other primary type.Primary cells available in a range of button and coin cell sizes.
Rechargeable high power cells available for traction applications.
ShortcomingsSensitive to extreme temperature and humid conditions.
Carbon dioxide from the air forms carbonate which reduces conductivity.
High self discharge.
After activation, chemicals tend to dry out and the batteries have to be used
quickly.
Although recharging is possible it is also inconvenient and is only suitable for high power types.
High internal resistance which means zinc air batteries must be huge to satisfy high current needs.
High power batteries such as those designed for traction applications use mechanical charging in which discharged zinc cartridges are replaced by fresh zinc cartridges. The used cartridges are subsequently recycled.
Lähetetty: 04.11.2009 20:07