Abstract
Tests in 2 V cells were performed to study the cause of the decrease of capacity and cell voltage. It was found that the capacity of aged cells increased significantly when expanders like Indulin C and Na-1-naphthol-4-sulfonate were added. The cell voltage, lowered by an excess of hydrogen evolution, increased after addition of anisaldehyde. The beneficial effect of both the expanders and inhibitor lasted for several tens of cycles. Addition of anisaldehyde in an aged 2 V submarine cell (8.9 kAh), at a temperature of 30 °C, gave an increase of cell voltage of 145 mV. This increase is almost entirely due to an increase in overvoltage of the hydrogen-evolution reaction at the negative plate. Measurements in 2 V cells confirm the results of short time tests on smooth lead electrodes described in part 1.
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