Abstract
The effects of titanium on the crystalline structure and electrochemical properties of Zr-based AB 2 electrode alloys were investigated. SEM, XRD and Rietveld analysis were used to analyze the microstructures and phase composition and abundance of the alloys. It was found that titanium could significantly change the phase abundance of Zr 1− x Ti x (NiVMnCr) 2.1 ( x=0, 0.1, 0.3) alloys. The C14 Laves phase increases and the C15 Laves phase and non-Laves phase decrease as the amount of titanium additive increases. Titanium also causes the cell parameters to contract. The more titanium added to the alloys, the more the cell volume of the alloys contracts. The microstructures of the three alloys, with or without titanium addition, were observed by scanning electron microscopy (SEM) and were shown to be dendrites. This shows that titanium has no effect on the microstructure of the alloys. Electrochemical analysis showed that titanium additive electrodes have a higher discharge capacity, but no obvious effect on the activation process. It is believed that the main reason for the increase in capacity of titanium additive electrodes is the increase in the amount of Laves phases (C14+C15 phases). Titanium additive improved the charging/discharging cycle life of Zr 1− x Ti x (NiVMnCr) 2.1 ( x=0, 0.1, 0.3) alloys and reduced the average capacity attenuation rate during charging/discharging cycling due to the excellent corrosion resistance of titanium.
Published Version
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