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Fabrication Characteristics and Hydrogenation Behavior of Hydrogen Storage Alloys for Sealed Ni-MH Batteries

机译：密封镍氢电池储氢合金的制备特性和氢化行为

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摘要

Hydrogen storage alloys based on LmNi_(4.2)Co_(0.2)Mn_(0.3) Al_(0.3) were fabricated to study the equilibrium hydrogen pressure and electrochemical performance. The surface morphology and structure of the alloys were analyzed by SEM and XRD, and then the hydrogenation behaviors of all alloys were evaluated by PCT and electrochemical half-cell. We studied the hydrogenation behavior of the Lm-based alloy with changes in composition elements such as Mn, Al, and Co and investigated the optimal design for Lm-based alloy in a sealed battery system. As a result of studying the hydrogenation characterization of alloys with the substitution elements, hydrogen storage alloys such as LmNi_(3.75)Co_(0.45)Mn_(0.5)Al_(0.3) and LmNi_(3.5)Co_(0.5)Mn_(0.5)Al_(0.5) were obtained to correspond with the characteristics of a sealed battery with a higher capacity, long life cycle, lower internal pressure, and lower battery cost. The capacity preservation rate of LmNi_(3.5)Co_(0.5)Mn_(0.5)Al_(0.5) was greatly improved to 92.7 percent (255 mAh/g) at 60 cycles, indicating a low equilibrium hydrogen pressure of 0.03 atm in PCT devices.
机译：制备了基于LmNi_（4.2）Co_（0.2）Mn_（0.3）Al_（0.3）的储氢合金，研究了平衡氢气压力和电化学性能。通过SEM和XRD分析了合金的表面形貌和结构，然后通过PCT和电化学半电池评估了所有合金的氢化行为。我们研究了随着组成元素（例如Mn，Al和Co）的变化，Lm基合金的氢化行为，并研究了密封电池系统中Lm基合金的最佳设计。研究了具有取代元素的合金的氢化特性，结果发现储氢合金如LmNi_（3.75）Co_（0.45）Mn_（0.5）Al_（0.3）和LmNi_（3.5）Co_（0.5）Mn_（0.5）Al_获得（0.5）以对应于具有更高容量，长寿命周期，更低内部压力和更低电池成本的密封电池的特性。 LmNi_（3.5）Co_（0.5）Mn_（0.5）Al_（0.5）的容量保持率在60个循环后大大提高到92.7％（255 mAh / g），表明PCT装置的平衡氢压低至0.03 atm。

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