HIGH CAPACITY MAGNESIUM BATTERIES
Abstract
An analysis of heat evolved during Mg-cell discharge showed the heat is due to the irreversibility of the Mg anode and to corrosion. The heat must be controlled for efficient operation. An efficient heat sink must be used at high discharge rates to control voltage tolerance. The use of a water sink permits good operation at rates as low as the 7-min rate. A cathode efficiency of 88% was obtained with a HgO reserve cell at an 8-min discharge rate by using a thin plate construction. Capacity based on element wt. and volume was 39 whr/lb and 4.5 whr/cu in. Delayed-action studies of AZ-21 Mg-Mg(ClO4)2 MnO2 cells on a tranceiver-type discharge showed this alloy has characteristics similar to AZ-31 alloy. Impedance of AZ-21 Mg-Mg(ClO4)2-MnO2 A-size cells was slightly lower than comparable AZ-10 alloy cells. Delayed action and impedance measurements of Mg(AZ-10)-Mg(ClO4)2-MnO2 and CuO cells stored for 1 yr showed no significant difference from initial fresh-cell results. Cell capacities averaged 90%.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1961
- Accession Number
- AD0274750
Entities
People
- G. S. Lozier
- R. J. Ryan