Electrochemical properties of the LaNi4.5Co0.25Al0.25 hydrogen storage alloy in wide temperature range

The effect of temperature on the overall electrochemical properties of LaNi4.5Co0.25Al0.25 hydrogen storage alloy has been studied systematically. The results show that temperature has a striking effect on the overall electrochemical properties. The LaNi4.5Co0.25Aln0.25 alloy electrode has a maximum capacity of 324.4 mA h/g at 253 K after first activation at room temperature. The cycling stability and capacity retention S50 increase with the decreasing temperature from 333 K to 253 K, while the reversible capacity loss (RCL) and irreversible capacity loss (ICL) both increase with elevation of testing temperature. The high-rate discharge ability (HRD) at room temperature is superior to that of other temperatures.