稀土对Ti-Zr-V-Cr-Ni合金微观结构和电化学性能的影响  

Effects of Rare Earth Addition on Microstructure and Electrochemical Properties of Ti-Zr-V-Cr-Ni Alloys

作　　者：李佳[1] 赵敏寿[1] 侯春平[1] 黄亮[1] 朱新坚[2] 曹广益[2] 

机构地区：[1]燕山大学环境与化学工程学院,河北秦皇岛066004 [2]上海交通大学燃料电池研究所,上海200030

出　　处：《中国稀土学报》2006年第6期764-768,共5页Journal of the Chinese Society of Rare Earths

基　　金：中国科学院稀土化学与物理重点实验室基金资助项目

摘　　要：研究了稀土对Ti0.17Zr0.08V0.35Cr0.1Ni0.3合金的微观结构和电化学性能的影响。结果表明,Ti0.17Zr0.08V0.35Cr0.1Ni0.3和Ti0.17Zr0.08V0.35Cr0.1Ni0.3RE0.05(RE分别代表La,Ce,Pr,Nd和混合稀土)合金均由主相为体心立方结构的钒基固溶体相和少量六方结构的C14 Laves相组成;在合金中加入稀土元素,同时增大合金中两相的晶胞体积。镧和其他金属元素结合形成新相分布于合金中。添加稀土元素可以改善合金电极的活化性能。镧的添加降低了合金电极在60 mA.g-1下的最大放电容量,但对其理论放电容量几乎没有影响;合金的放电容量对温度的变化比较敏感,过高的温度使其容量发生衰减,含稀土元素的合金电极在323 K温度下放电容量达到最大值。稀土对合金电极的荷电保持率产生不利影响,镧、钕和混合稀土的添加能够改善合金电极的倍率放电性能。The effects of rare earth addition on microstructure and electrochemical properties of Ti0.17Zr0.08 Vo.35Cr0.1Ni0.3 alloys were studied, It is found that these alloys all consist of V-based solid solution with bcc structure as main phase and C 14 Laves phase with hexagonal structure. The cell volumes of both phases are swelled after rare earth elements adding to the alloys. In the alloy, a new phase was found, which comprises of La and some other elements. The addition of rare earth elements can improve the activation characteristics of the alloy electrodes. Although its maximum discharge capacity at 60 mA·g^-1 is reduced, the measured theoretical capacity of the alloy electrode with La is almost the same as one without La. Discharge capacities of the alloy electrodes are sensitive to the fluctuation of temperature, which of the alloy electrodes with rare earth reach the peak value at 323 K. Charge retention is adversely affected by rare earth addition, although the addition of La, Nd and mischmetal can enhance the high rate dischargeability （HRD） of the alloy electrodes.

关 键 词：钒基固溶体合金 电化学性能 MH-NI电池 稀土 

分 类 号：TG146.4[一般工业技术—材料科学与工程] O611.61[金属学及工艺—金属材料]