The study on the electrochemical performance of mechanically alloyed Mg-Ti-Ni-based ternary and quaternary hydrogen storage electrode alloys
The study on the electrochemical performance of mechanically alloyed Mg-Ti-Ni-based ternary and quaternary hydrogen storage electrode alloys
复制标题
机械合金化Mg-Ti-Ni基三元、四元储氢电极合金电化学性能研究
DOI：
10.1016/s0360-3199(01)00025-8
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发表时间：
2001-08
期刊：
影响因子：
--
通讯作者：
Zhang Yao, Chen Li-xin, Lei Yong-quan
中科院分区：
文献类型：
--
作者：
Zhang Yao, Chen Li-xin, Lei Yong-quan
本文采用机械合金化（MA）方法制备了三元Mg 50 − xTixNi 50（x= 5，10，15）和四元Mg35 Ti 10 M5 Ni 50（M = Y，Al，Zr）镁基储氢电极。通过X射线衍射仪（XRD）和扫描电镜（SEM）研究了Mg 35 Ti 15 Ni 50合金在MA过程中的相结构变化和形貌。通过放电试验研究了Ti含量对Mg-Ti-Ni三元电极合金放电容量、循环寿命和高倍率放电性能的影响。结果表明，随着Ti含量的增加，Mg 50 − xTixNi 50合金的循环稳定性提高，但放电容量和高倍率放电性能均下降。MA四元合金Mg35 Ti 10 M5 Ni 50（M = Y，Al，Zr）比三元合金Mg35 Ti 15 Ni 50具有更长的循环寿命和更低的放电容量。在合金颗粒表面包覆Ni对提高合金的循环稳定性也有一定的作用，发现包覆Ni有利于合金的循环稳定性，但不利于合金的放电容量
In this paper, ternary Mg50−xTixNi50(x=5,10,15) and quaternary Mg35Ti10M5Ni50( M = Y , Al , Zr ) magnesium-based hydrogen storage electrodes prepared by means of mechanical alloying (MA) were investigated. Through X-ray diffractometer (XRD) and scanning electron microscope (SEM) investigation, the phase structure transformation and morphology of Mg35Ti15Ni50during MA process were examined. The effects of Ti content on discharge capacity, the cycling life and high rate dischargeability of the ternary Mg–Ti–Ni electrode alloys were studied in the discharge tests. It was found that as the Ti content increased the cycling stability of Mg50−xTixNi50alloys improved but the discharge capacity and high rate discharge-ability both decreased. The MA quaternary Mg35Ti10M5Ni50( M = Y , Al , Zr ) alloys had significantly longer cycling life but lower discharge capacity than the ternary alloy Mg35Ti15Ni50. Surface coating of alloy particles with Ni was also tested for improving the cycling stability of the ternary alloys and found beneficial for cycling stability and bad for discharge capacity
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