储氢电池用新型镁基合金的制备与性能研究

Preparation and Properties of New-type Magnesium-based Alloy for Hydrogen Storage Battery

采用机械合金化方法制备了储氢电池用新型镁基合金Mg-8Ca-5Si-3V-0.3Cr,并进行了XRD、SEM、吸放氢性能、充放电循环性能和耐腐蚀性能的测试。结果表明,该合金为非晶合金,能在室温吸放氢,最大吸氢量为3.962%,放氢平台压力约为0.5 MPa;与熔炼法制备的Mg2Ni镁基储氢合金相比,该合金经20次充放电循环后放电容量衰减率从99.6%减小至20.6%,腐蚀电位正移313m V。

The new-type magnesium-based alloy of Mg-8Ca-5Si-3V-0.3Cr for hydrogen storage battery was prepared by mechanical alloying, and the XRD analysis, SEM observation, hydriding-dishydriding property, charging/discharging cycling stability and corrosion resistance test were carried out. The results show that the new-type alloy is amorphous alloy, that can be hydride and dehydrate at room temperature and the maximum hydriding quality is 3.962%, and the press of dishydriding platform is about 0.5 MPa. Furthermore, compared with the magnesium-based alloy of Mg2 Ni prepared by melting, the new-type alloy made the discharge capacity decay rate after charging/discharging cycling for 20 times decreases from 99.6%to 20.6%, and the corrosion potential changes from 313 m V to positive direction.