| 贮氢电极合金ZrCr_(0.4)Mn_(0.2)V_(0.1)Co_(0.1)Ni_(1.2)高温电化学性能的研究 |
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| 引用本文： | 李嵩,季世军,孙俊才. 贮氢电极合金ZrCr_(0.4)Mn_(0.2)V_(0.1)Co_(0.1)Ni_(1.2)高温电化学性能的研究[J]. 电化学, 2004, 10(1): 81-86 |
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| 作者姓名： | 李嵩 季世军 孙俊才 |
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| 作者单位： | 大连海事大学材料工艺研究所,大连海事大学材料工艺研究所,大连海事大学材料工艺研究所 辽宁大连116026 ,辽宁大连116026 ,辽宁大连116026 |
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| 基金项目： | 高等学校博士学科点专项科研项目，辽宁省科技厅资助项目，20010151001，001056，， |
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| 摘 要： | 研究了AB2型Laves相贮氢电极合金ZrCr0.4Mn0.2V0.1Co0.1Ni1.2在不同温度下的放电容量、活化、高倍率和自放电等电化学性能.实验表明:25℃下,合金电极经13次循环后其最大放电容量为336mAh/g,在70℃下,仅需4次循环就达到298mAh/g;该合金在70℃,300mA/g电流下的高倍率放电性能比25℃时提高了约16%,但自放电性能却从3%/d下降到17%/d,虽然温度升高,合金的循环性能有所下降,但还是相当稳定的.这主要是因为循环过程中合金表面形成的氧化膜阻碍了合金元素进一步溶解造成的.
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| 关 键 词： | 贮氢电极合金 高温 活化性能 自放电性能 循环稳定性 |
| 文章编号： | 1006-3471(2004)01-0081-06 |
| 收稿时间： | 2004-02-28 |
| 修稿时间： | 2003-07-09 |
Study of Electrochemical Properties of the Hydride Alloy Electrode ZrCr0.4Mn0.2V0.1Co0.1Ni1.2 at High Temperature |
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| Abstract: | Electrochemical properties of the hydride alloy electrode ZrCr_(0.4)Mn_(0.2)V_(0.1)Co_(0.1)Ni_(1.2) at the different temperature have been investigated. The results showed that the alloy electrodes possessed the maximum discharge capacities 336 mAh/g and 298 mAh/g at 25 ℃ and 70 ℃ respectively. The activation process of the alloy at 70 ℃ became faster, and the alloy reached its maximum capacity in less than 4 cycles, while in 13 cycles at 25 ℃. The high rate capability increased from 55 % at 25 ℃ to 71% at 70 ℃ at 300 mA/g. It was worth noting that the alloys at 25 ℃ and 70 ℃ exhibited an excellent cycle stability. The formation of the oxide film on the alloy particle surface prohibited the dissolution of the elements of the alloy during the charging-discharging process. |
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| Keywords: | Hydride electrode alloy High temperature Activity Self-dischargeability (Cycle) life |
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