Improved Alkaline Earth-Oxyhalide Electrochemical Cell for Low Temperature Use.
Patent Application, Filed 20 May 88,
DEPARTMENT OF THE ARMY WASHINGTON DC
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This invention relates in general to an alkaline earth-oxyhalide electrochemical cell and in particular, to an improved alkaline earth oxyhalide electrochemical cell for low temperature use. A typical cell includes a calcium anode, 1M CaAlCl42 thionyl chloride75 percent Shawinigan - 25 percent acetone washed Black Pearls 2000 carbon black cathode. The improvement to this cell involves the addition of 10 volume percent bromine to the electrolyte. During discharge at about -30 C, cathode potential is raised by about 0.5 volt providing a cell voltage well above the 2.0 volt minimum which is a standard military specification. Without bromine, cell capacity is about one minute. With the addition of bromine, load voltage is initially 2.5 volts, then slowly decreases to 2.0 volts over about twelve minutes.
- Electrochemical Energy Storage