论文部分内容阅读
采用机械合金化法(MA)制备了非晶态LaMg11Zr+200%(质量分数,下同)N i+x%La(x=0,5,10)系列储氢合金,并详细研究了La添加对该系列合金的相结构及电化学性能的影响。结构分析表明,球磨20h该系列合金都呈非晶态,La添加后合金颗粒得到明显细化;电化学研究表明,La添加后,合金电极充电阻力减小,放电容量随La含量的增加而增大,适量La的添加一定程度上改善了合金电极的循环稳定性和动力学性能,LaMg11Zr+200%N i+5%La合金电极达到最大放电容量597.2mAh.g-1,循环30次后的容量保持率仍为53.5%。
Amorphous LaMg11Zr + 200% (mass fraction) Ni i + x% La (x = 0,5,10) series hydrogen storage alloys were prepared by mechanical alloying method (MA) Effect on the phase structure and electrochemical performance of this series of alloys. The results of the structure analysis showed that all the alloys were amorphous after ball milling for 20h, and the alloy particles were refined after La addition. The electrochemical studies showed that the resistance of the alloy electrode decreased after La addition, and the discharge capacity increased with the increase of La content The addition of large amount of La can improve the cycle stability and kinetic performance of the alloy electrode to a certain extent. The maximum discharge capacity of LaMg11Zr + 200% Ni + 5% La alloy electrode reaches 597.2mAh.g-1. After 30 cycles Capacity retention is still 53.5%.