Essay Comparison of Batteries

1088 WordsDec 10, 20125 Pages
Lead Acid Cell vs. Button Cell Lead acid cells were invented in 1859 by the French Physicist Gaston Plante, and are the oldest types of rechargeable batteries. These types of batteries typically weigh at 5kg, but can range from half a kilogram to over 30 kilograms on the consumer market. Though their chemistry means a very low energy-to-weight and energy-to-volume ratio in comparison to other modern batteries, their ability to supply high surge currents means that the cells maintain a large power-to-weight ratio. This makes them highly desirable for use in large appliances such as motor vehicles, which require the high current provided by this type of battery. In comparison, Button cells are much smaller than lead acid cells.…show more content…
Common anode materials are zinc or lithium, and there are a range of cathode materials, including manganese dioxide, silver oxide, and cupric oxide. Of notable mention is the mercuric oxide button cell, which was banned due to the toxicity and environmental hazard of mercury. Reaction between silver oxide (cathode) and zinc (anode): Zn + Ag2O ZnO + 2Ag These batteries are dry batteries, and are created with the ideal of a long lifetime. As such, they rarely leak if ever, and boast a steady electricity production over a long period of time. Both Lead acid cells and button cells rely on chemical reactions for the production of their energy. However, where a lead-acid cell would typically use an anode and cathode within a liquid or gel medium, button cells use solid anode and cathodes which react with each other through a separator. This reflects their uses; where the chemistry of a lead acid battery allows it to produce large amounts of electricity in surges as needed to start appliances such as motor vehicles, the chemistry of Button cells allows for a slow and steady release of small amounts of charge. Cost and Practicality As was reflected upon under the chemistry subtitle, the batteries have been designed, and retain their designs, to specifically fit their uses. Though the size of the lead acid batteries does not allow for the powering of small portable devices such as watches,
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