Study of Electrochemical Properties of La-Y-Ni System Hydrogen Storage Alloys
The structure of La0.5Nd0.5Y2Ni9.5Mn0.5Al0.5 hydrogen storage alloy and its electrochemical properties were mainly investigated.The alloy was prepared using vacuum arc melting method,its structure was tested by X-ray diffraction test(XRD test),and the electrochemical properties of the alloy were determined by DC-5 battery tester.The maximum discharge capacity of the alloy electrode can reach 265.5 mAh·g-1.The cycling relationship curve of La0.5Nd0.5Y2Ni9.5Mn0.5Al0.5 alloy clearly shows that when the cycle reaches the 60th cycle,the capacitance retention of the electrode of the alloy,S60,still reaches 70.5％,which indicates that the hydrogen storage alloy has good cycling stability at a temperature of 303 K.This indicates that the hydrogen storage alloy has good cycling stability at 303 K.The high multiplicity performance of the hydrogen storage alloy electrode decreases with the increase of temperature.At 303 K,La0.5 Nd0.5 Y2Ni9.5 Mn0.5 Al0.5 hydrogen storage alloy has the best high rate discharge performance.Although the high rate discharge performance of the alloy electrodes decreases with increasing temperature,the degree of slowing down also decreases gradually.The results indicate that the La0.5Nd0.5Y2Ni9.5Mn0.5Al0.5 alloy is of high research significance,and its application prospect will be very broad after the low-cost La-Y-Ni system hydrogen storage alloy is successfully applied and put into production in large quantities.
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