INVESTIGATIONS OF THE NEGATIVE PLATE OF LEAD ACID CELLS .2. VERIFICATION WITH 2-V CELLS

Tests in 2 V cells were performed to study the cause of the decrease o f capacity and cell voltage. It was found that the capacity of aged ce lls increased significantly when expanders like Indulin C and Na-1-nap hthol-4-sulfonate were added. The cell voltage, lowered by an excess o f hydrogen evolution, increased after addition of anisaldehyde. The be neficial effect of both the expanders and inhibitor lasted for several tens of cycles. Addition of anisaldehyde in an aged 2 V submarine cel l (8.9 kAh), at a temperature of 30-degrees-C, gave an increase of cel l voltage of 145 mV. This increase is almost entirely due to an increa se in overvoltage of the hydrogen-evolution reaction at the negative p late. Measurements in 2 V cells confirm the results of short time test s on smooth lead electrodes described in part 1.