Abstract
The characteristics of the negative electrode of a Ni/MH (metal hydride) battery are related to the charge transfer and mass transfer processes at the interface between the MH electrode and the electrolyte. With increasing number of charge/discharge cycles, the MH alloy powders micro-crack into particles that are several microns in diameter and this then influences the exchange current density. A polarization experiment was used to analyze the charge transfer and mass transfer processes. The exchange current densities of uncoated and Pd-coated Mm 0.95 Ti 0.05 Ni 3.85 Co 0.45 Mn 0.35 Al 0.35 alloy electrodes increase with increasing number of charge/discharge cycles before reaching a constant value after 20–30 cycles.
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