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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。
The self-discharge performance of La0.65Mg0.35Nix (x = 3.0 ~ 3.5) hydrogen storage alloy electrode was systematically studied. The results show that with the increase of Ni content, the maximum discharge capacity increases from 350.6mAh · g-1 (x = 3.0) to 351.2mAh · g-1 (x = 3.1), and then decreases to 244.1mAh · g- 1 (x = 3.5). The capacity retention of self-discharge at 72h increased from 77.7% (x = 3.0) to 79.5% (x = 3.1) and then decreased to 63.5% (x = 3.5). The moderate Ni content is beneficial to reduce the self-discharge rate of the alloy electrode. By measuring the P-C-T curve of the alloy electrode and the corrosion curve of the alloy, the variation law of the self-discharge performance of the alloy electrode was analyzed.