La0.65Mg0.35Nix (x =3.0~3.5)储氢合金电极自放电性能研究

系统地研究了La0.65Mg0.35Nix(x=3.0～3.5)储氢合金电极的自放电性能。结果表明,随着Ni含量的增加,合金电极最大放电容量从350.6mAh·g-1(x=3.0)增加到351.2mAh·g-1(x=3.1),然后减小到244.1mAh·g-1(x=3.5)。72h自放电的容量保持率从77.7%(x=3.0)增加到79.5%(x=3.1),然后又降低到63.5%(x=3.5)。说明适中的Ni含量有利于降低合金电极的自放电率。通过测量合金电极的P-C-T曲线和合金的腐蚀曲线分析了合金电极自放电性能的变化规律。

Investigation on the Self-Discharge Property of La0.65Mg0.35Nix (x = 3.0~3.5) Hydrogen Storage Alloy Electrodes

The self-discharge property of La0.65Mg0.35Nix (x=3.0~3.5) hydrogen storage alloy electrodes was studied systematically. The results show that with the Ni content increasing, the maximum discharge capacity of the alloy electrodes increases from 350.6 mAh·g-1 (x=3.0) to 351.2 mAh·g-1 (x=3.1) and then decreases to 244.1 mAh·g-1 (x=3.5). Moreover, the capacity retention rate of 72 h self-discharge increases from 77.7% (x=3.0) to 79.5% (x=3.1), and then decreases to 63.5% (x=3.5), which indicates that the self-discharge property of the alloy electrodes is improved by the appropriate Ni content. The variety of the self-discharge property of the alloy electrodes with x value was analyzed by testing the electrochemical pressure-component-temperature (P-C-T) curves and corrosion curves of the alloy electrodes.