Abstract
The aim of this work was to study the influence of titanium and thermal pretreatments on the electrochemical performance of Zr1−xTixCr0.7Mo0.3Ni alloys used as anodic active materials in Ni-MH batteries to improve their electrochemical energy storage performance. It was observed that the substitution of Zr by Ti produced new responses in electrochemical impedance spectroscopy (EIS) diagrams. EIS spectra were adjusted employing a fitting methodology through a model for a porous electrode where the physical meanings of parametric figures and time constants were emphasized. Changes in the system response with the electrode state of charge (SOC) were also studied, and new functional relations between time constant values and SOC were found. The results give new evidence supporting the fact that certain crystallographic phases (such as cubic center body phases) have a helpful influence on the diffusion process, while other phases (such as the hexagonal titanium phase) contribute negatively to it.
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