Ti_(0.17)Zr_(0.08)V_(0.34)Cu_(0.01)Cr_(0.1)Ni_(0.3)储氢合金结构与电化学性能研究  

Microstructure and electrochemical characteristics of Ti_(0.17)Zr_(0.08)V_(0.34)Cu_(0.01)Cr_(0.1)Ni_(0.3)hydrogen storage alloy

作　　者：李梅晔[1] 乔玉卿[2] 赵敏寿[2] 

机构地区：[1]中国科学院长春应用化学研究所国家电化学和光谱研究分析中心,吉林长春130022 [2]燕山大学环境与化学工程学院

出　　处：《功能材料》2006年第8期1249-1252,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20171042)

摘　　要：采用XRD、FESEM-EDS、ICP及EIS等方法对Ti0．17Zr0.08V0.34Cu0．01Cr0．1Ni0．3储氢合金的微观结构及电化学性能进行了研究。XRD分析结果表明Ti0．17Zr0．08V0．34Cu0．01Cr0．1Ni0．3固溶体储氢合金由BCC结构的V基固溶体主相和少量的C14Laves相组成。FESEM-EDS测试结果表明V基固溶体主相为树枝晶结构，C14Laves相呈网格状围绕着树枝晶。电化学测试结果表明，Ti0．17Zr0．08V0．34Cu0.01Cr0．1Ni0.3。氢化物电极在303～343K较宽的温度区间内具有良好放电容量，在343K时电化学容量高达316．5mAh／g；在303K时循环100周次后，其容量为278．2mAh／g，容量保持率为87．0%，表明氢化物电极具有较好的循环稳定性，但其高倍率放电性能较差。Ti0.17Zr0.08V0.34Cu0.01Cr0.1Ni0.3氢化物电极的电化学阻抗谱表明，电极电化学反应的电荷转移电阻（RT）随温度的增加而显著降低，交换电流密度（I0）随温度的增加显著增加。ICP分析结果表明，V和Zr元素向KOH电解质中溶解严重，这可能是Ti0．17Zr0．08V0．34CU0．01Cr0．1Ni0.3氢化物电极容量衰减的主要原因。Microstructure and electrochemical properties of Ti0.17 Zr0.08 V0.34 Cuo. 01 Cr0.1 Ni0.3 hydrogen storage alloy have been investigated by using XRD, FESEM-EDS, ICP and EIS measurements. The result of XRD and FESEM-EDS analysis shows that the alloy is mainly composed of V-based solid solution phase with body-centered-cubic （BCC） structure and C14 Laves phase with hexagonal structure, V-based solid solution phase forms dendric with C14 Laves phase surrounding it. The alloy electrode has a good discharge capacity within a wide temperature region from 303-343K, and the discharge capacity is 316.5mAh/g at 343K. The discharge capacity of the alloy electrode is 278.2mAh/g and the charge retention is 87. 0% after 100th cycles at 303K, which shows the alloy electrode has good cycle stability,but the HRD is lower than other alloys. The result of electrochemical impedance spectrometry （EIS） indicates that charge transfer resistance （RT） is decrease with increasing temperature, while exchanging current density is increase with increasing temperature. The dissolution of V and Zr element to KOH electrolyte is seriously, which is perhaps a main factor to affect the discharge capacity.

关 键 词：MH—Ni电池 氢化物电极 V基固溶体 

分 类 号：TM912.9[电气工程—电力电子与电力传动]