低钴贮氢合金的性能研究及热力学函数测定  

Study and Determination of Thermodynamic Parameters of Low Co Hydrogen Storage Alloy

作　　者：张树雄[1] 娄树普[2] 张沛臣[3] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]东北大学机械工程及自动化学院,辽宁沈阳110004 [3]包头稀土研究院,内蒙古包头014030

出　　处：《稀土》2009年第3期41-44,48,共5页Chinese Rare Earths

摘　　要：利用真空熔炼和真空薄带速凝工艺制备了低钴AB5贮氢合金,并研究了合金组织结构和电化学特性。该合金活化性能好,最大放电容量达337.1mAh/g,具有较好的高倍率充放电能力。采用Sievelts装置测定了PCT曲线及热力学参数,该合金吸氢反应的焓变及熵变值分别为-46.3kJ·mol-1和-120.5J.mol-1.K-1,表明了室温和常压下,这种金属间氢化物都具有较高的稳定性,并且符合作为MH-Ni蓄电池负极材料稳定性的要求。In this study the hydrogen storage alloy AB5 was prepared by strip casting techniques, the structure and electrochemical performance of the alloy were investigated. The electrochemical analysis indicated that the alloy by SC technique has a good activation property, higher maximum discharge capacity and better cycling stability, a good high - rate eyehng capability. The PCT curves of the hydrogen- storage alloy were examined by solid- gas phase hydrogen absorbing- desorbing and electrochemical method, the thermodynamic characteristics of the alloy were calculated by Van＇t Hoff equation. This alloy may hold some promise as stable MH electrodes for the MH- Ni batteries.

关 键 词：真空速凝薄带工艺 低钴贮氢合金 电化学性能 热力学函数 

分 类 号：TM139.7[电气工程—电工理论与新技术] TG146.4[一般工业技术—材料科学与工程]