HIGH RATE BATTERIES.
NAVAL RESEARCH LAB WASHINGTON D C
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The capacity and efficiency of a battery increase rapidly as the porosity of the active materials in the plates is increased. At porosities of 85 to 90 percent, ampere-hour efficiencies of more than 50 percent were obtained in discharge times of as little as one minute over a range of temperatures extending down as low as -60C. Metal plates of controlled porosities and high surface areas were produced by the electrolytic reduction of metal compounds subjected to controlled physical pressure during electrolysis. Anodic active materials were prepared in an analogous manner. The active materials thus prepared and tested included zinc, cadmium, lead, Ag2O and AgO, all of which provided highly successful electrode materials. The results of tests on these materials indicate that the technique can be applied to many more active materials, thus pointing the way to the production of a wide range of extremely high-rate, low-temperature batteries.
- Electrochemical Energy Storage