La-Y-Ni体系储氢合金的电化学性能的研究  

Study of Electrochemical Properties of La-Y-Ni System Hydrogen Storage Alloys

作　　者：袁芳雪 杨智勇 Yuan Fangxue;Yang Zhiyong(College of Safety Science and Engineering,Xinjiang Institute of Engineering,Urumqi 830023,China)

机构地区：[1]新疆工程学院安全科学与工程学院,新疆乌鲁木齐830023

出　　处：《山东化工》2024年第6期38-41,共4页Shandong Chemical Industry

摘　　要：主要研究了La_(0.5)Nd_(0.5)Y_(2)Ni_(9.5)Mn_(0.5)Al_(0.5)贮氢合金的结构及其电化学性能。使用真空电弧熔炼法制备合金,通过X射线衍射测试(XRD测试)测试其结构,用DC-5型电池测试仪测定合金的电化学性能。合金电极的放电容量最大可达到265.5 mAh·g^(-1)。由La_(0.5)Nd_(0.5)Y_(2)Ni_(9.5)Mn_(0.5)Al_(0.5)合金的循环关系曲线可以清楚地看出,当循环达到第60个周期时,此合金电极的电容量保持率S60仍能达到70.5%,这说明了此种储氢合金在303 K的温度下,有着良好的循环稳定性。储氢合金电极的高倍率性能随着温度的升高逐渐降低。高倍率放电性能在303 K时La_(0.5)Nd_(0.5)Y_(2)Ni_(9.5)Mn_(0.5)Al_(0.5)储氢合金的表现最为突出。尽管随着温度的升高,合金电极的高倍率放电性能在逐渐降低,但是减缓的程度也在逐渐降低。结果说明,La_(0.5)Nd_(0.5)Y_(2)Ni_(9.5)Mn_(0.5)Al_(0.5)合金具有较高的研究意义,在低成本La-Y-Ni系储氢合金成功应用并大量投入生产后,其应用前景将非常广阔。The structure of La_(0.5) Nd_(0.5) Y_(2)Ni_(9.5) Mn_(0.5) Al_(0.5) 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 La_(0.5) Nd_(0.5) Y_(2)Ni_(9.5) Mn_(0.5) Al_(0.5) 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,La_(0.5) Nd_(0.5) Y_(2)Ni_(9.5) Mn_(0.5) Al_(0.5) 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 La_(0.5) Nd_(0.5) Y_(2)Ni_(9.5) Mn_(0.5) Al_(0.5) 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.

关 键 词：贮氢合金 La-Y-Ni体系 镍氢电池 

分 类 号：TQ150[化学工程—电化学工业]