Accession Number : AD0663551

Title :   INCREASING THE DISCHARGE CAPACITY OF A SILVER OXIDE ELECTRODE BY CHARGING WITH 60-CYCLE ASYMMETRIC AC,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Wales,C. P.

Report Date : 07 NOV 1967

Pagination or Media Count : 21

Abstract : The discharge capacity of sintered silver electrodes used in storage batteries was improved 40 to 50% when the prior charge was made by an alternating, rather than constant, current. Commercial Ag-Zn cells, under the same conditions, gave capacity increases of 15 to 25%. This improvement was obtained by charging the cells with 60-cps asymmetric ac, composed of two opposing half-wave currents 180 degrees out of phase and unequal in amplitude, as compared with charging by a constant current, both being at the 20-hr rate in 35% KOH at 25C. Capacity depended on the proportion of charge and discharge components of the ac. Capacity improvements were smaller when net charge current was set at the 6-hr rate, when charge current was composed of 60-cps half-wave reverse current superimposed on constant charge current, or when the KOH concentration was increased. No significant improvement occurred when the charge with reverse current followed a series of discharges at the 1-hr rate. (Author)

Descriptors :   (*ALKALINE BATTERIES, ELECTRODES), (*ELECTRODES, *SILVER COMPOUNDS), STORAGE BATTERIES, OXIDES, ELECTRIC DISCHARGES, SILVER, ZINC, ELECTROLYTES, POTASSIUM COMPOUNDS, HYDROXIDES, BATTERY CHARGERS, ALTERNATING CURRENT

Subject Categories : Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE