| 一种改善La-Mg-Ni贮氢电极合金性能的方法 |
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| 引用本文： | 安富强,李平,曲选辉,郑雪萍.一种改善La-Mg-Ni贮氢电极合金性能的方法[J].北京科技大学学报,2008,30(3):263-266. |
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| 作者姓名： | 安富强 李平 曲选辉 郑雪萍 |
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| 作者单位： | 1. 北京科技大学材料科学与工程学院,北京,100083
2. 北京科技大学材料科学与工程学院,北京,100083;北京科技大学新金属材料国家重点实验室,北京,100083 |
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| 摘 要： | 提出用放电等离子烧结技术(SPS)改善La-Mg-Ni贮氢电极合金的综合电化学性能.所选La-Mg-Ni贮氢电极合金为La0.7Mg0.3Ni2.5Co0.5.实验结果表明,用SPS和真空中频感应熔炼制备得到的合金具有近似的最大放电容量.SPS技术增强了合金电极的循环寿命:在经过150次的充放电循环后,用SPS法制备的La0.7Mg0.3Ni2.5Co0.5合金的容量保持率为61.8%;而感应熔炼法得到的合金电极的容量保持率仅为39.6%.同时用SPS技术使合金的放电中值电压增加,放氢平台变宽,平台倾斜度减小.
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| 关 键 词： | 贮氢合金 电化学性能 放电等离子烧结(SPS) 真空感应熔炼 |
| 修稿时间： | 2006年12月25 |
A method to improve the properties of La-Mg-Ni hydrogen storage electrode al-loys |
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| AN Fuqiang,LI Ping,QU Xuanhui,ZHENG Xueping.A method to improve the properties of La-Mg-Ni hydrogen storage electrode al-loys[J].Journal of University of Science and Technology Beijing,2008,30(3):263-266. |
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| Authors: | AN Fuqiang LI Ping QU Xuanhui ZHENG Xueping |
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| Abstract: | The electrode alloy La0.7Mg0.3Ni2.5Co0.5 prepared by the spark plasma sintering (SPS) technology was used to investigated the improvement in electrochemical properties of La-Mg-Ni hydrogen storage alloys. The experimental results indicated that the maximum discharge capacities of the electrode alloys respectively prepared by SPS and vacuum medium-frequency induction melting were close. Using the SPS technology would decrease the weakening rate of capacity of the electrode alloy. After 150 cycles, the retention rate of capacity was 61.8% for the SPS technology, but 39.6% for the induction melting method. At the same time, the SPS technology would also increase the discharge medium voltage, broaden the discharge platform, and decrease the gradient of the platform. |
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| Keywords: | hydrogen storage alloy spark plasma sintering (SPS) electrochemistry vacuum induction melting |
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