Silver based batteries for high power applications
Section snippets
Background
A capacitor stores energy in an electric field. In contrast, a battery stores energy in the chemical reagents formed during the charging process. Upon discharge these chemicals then react to produce an electric current. The resistance of the electrolyte initially controls the rate of discharge of a storage battery. As the surface energy is depleted, discharge rates become dependent on chemistry and ion diffusion within the active layer. For thin cell batteries with properly formed active
Results and discussion
Over the years, special high rate, short duration tests were conducted on various standard Yardney high rate cells. Although some of these were short circuit tests, where the voltage drops to near 0 V, the peak power current can be calculated from the short circuit current. Assuming that the relation between voltage and current is linear, the peak power current is exactly one half of the short circuit current. For example, two parallel banks of Yardney model HR140DC cells, normally used for
Conclusion
For more than 50 years, primary and secondary silver–zinc batteries have attracted a variety of applications due to their high specific energy/energy density, demonstrated reliability, safety, and the highest power output per unit weight and volume of all commercially available batteries. There are a number of other secondary electrochemical systems that someday could provide power densities that are comparable to the silver-based couples such as the lithium-based systems (i.e., lithium-ion).
References (6)
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(1924)- M. Pollack, L.W. Matsch, Electric Gun and Power Source, Technical Report No. 14, Armour Research Foundation, May...
- Technical Memorandum no. 84-2027, Evaluation of Silver-Zinc HR 190 DC-2 Cells For Use In The Fast Target, NUWC,...
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