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为了提高合金的电化学性能,采用Ce部分替代La,并结合快淬方法制备了La_(1–x)CexMgNi_(3.5)Mn_(0.5)(x=0,0.1,0.2,0.3,0.4)贮氢合金。XRD和SEM测试结果表明,合金由LaMgNi_4主相以及LaNi_5第二相组成。随着快淬速度的增加,合金的晶格参数及晶胞体积逐渐增大,晶粒明显得到细化。电化学测试结果表明,铸态及快淬态合金具有优异的活化性能,其放电容量均在第一次循环时即可达到最大值。随着快淬速度的增加,合金的放电容量先增大后减小,但其循环稳定性逐渐提高。此外,合金电极的电化学动力学性能均随快淬速度的增加先提高后降低。
In order to improve the electrochemical performance of the alloy, Ce was used in place of La in combination with the rapid quenching method to prepare La_ (1-x) CexMgNi_ (3.5) Mn_ (0.5) (x = 0,0.1,0.2,0.3,0.4) alloy. The results of XRD and SEM show that the alloy consists of LaMgNi 4 main phase and LaNi 5 second phase. With the increase of quenching speed, the lattice parameters and unit cell volume of the alloy gradually increase, and the grain is obviously refined. Electrochemical test results show that the as-cast and quenched alloys have excellent activation properties, and the discharge capacity reaches the maximum value at the first cycle. With the increase of quenching speed, the discharge capacity of the alloy first increases and then decreases, but the cyclic stability of the alloy increases gradually. In addition, the electrochemical kinetics of the alloy electrode increased first and then decreased with the increase of quenching rate.