![]() ![]() Based on the report and surface analysis obtained from the energy dispersive X-ray spectroscopy, the composition formula of metal-hydride electrodes can be closely documented as the AB 5 type alloy and the “A” elements are recognized as lanthanum (La) and cerium (Ce). The capacity deterioration of this type, Ni-MH cell, is considered in relation to the change of activation resistance of the nickel positive electrodes. The cell capacity decay was diagnosed by analyzing the ohmic resistance, activation resistance, and mass transfer resistance of the Ni-MH cells with degraded capacity. An improved equivalent circuit model considering diffusion process is proposed for simulation of battery impedance data at different charge input levels. Impedance measurement was conducted at the entire cell level for studying of the Ni-MH rechargeable batteries.
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