| Mo对储氢合金RE_(0.78)Mg_(0.22)(Ni_(0.84-x)Co_(0.15)Al_(0.01)Mo_x)_(3.5)的结构及电化学性能的影响 |
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| 引用本文： | 汪保国,杨传铮,王丹,张灏,夏保佳,何丹农.Mo对储氢合金RE_(0.78)Mg_(0.22)(Ni_(0.84-x)Co_(0.15)Al_(0.01)Mo_x)_(3.5)的结构及电化学性能的影响[J].电源技术,2010,34(8). |
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| 作者姓名： | 汪保国 杨传铮 王丹 张灏 夏保佳 何丹农 |
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| 作者单位： | 1. 纳米技术及应用国家工程研究中心能源研究室,上海,200241
2. 中国科学院上海微系统与信息技术研究所,上海,200050 |
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| 基金项目： | 上海市闵行区科委创新基金项目 |
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| 摘 要： | 采用XRD分析了La0.50Pr0.22Nd0.06Mg0.22(Ni0.84-xCo0.15Al0.01Mox)3.5(x=0.00,0.01,0.02,0.03和0.04)合金的晶体结构,并且系统地研究了合金的气固相储氢特性和电化学性能。结果表明,合金由Ce2Ni7型结构的A2B7主相和少量的具有CaCu5结构的AB5相构成,晶轴比c/a随着Mo含量的增大而增大。合金在吸放氢过程中的熵变DS和焓变DH与AB5型合金的数值相当。合金的电化学容量随Mo含量的增加而减小,由x=0.00时的381.2 mAh/g下降到x=0.01时的379.5 mAh/g,再至x=0.04时合金的容量最大为362.0 mAh/g;合金容量的衰减速率因Mo的掺入而变大,由x=0.00时的-0.23 mAh/(g.次)降为x=0.04时的-0.97 mAh/(g.次);合金的倍率性能在x=0.01时得以改善,改善幅度为4%。研究表明当x≤0.01时不仅保持了合金的高容量,而且改善了合金的高倍率性能。
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| 关 键 词： | 储氢合金 La2Ni7相 LaNi5相 PCT性能 电化学性能 |
Effect of Mo content on structure and electrochemical characteristics of RE_(0.78)Mg_(0.22)(Ni_(0.84-x)Co_(0.15)Al_(0.01)Mo_x)_(3.5) hydrogen storage alloys |
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| WANG Bao-guo,YANG Chuan-zheng,WANG Dan,ZHANG Hao,XIA Bao-jia,HE Dan-nong.Effect of Mo content on structure and electrochemical characteristics of RE_(0.78)Mg_(0.22)(Ni_(0.84-x)Co_(0.15)Al_(0.01)Mo_x)_(3.5) hydrogen storage alloys[J].Chinese Journal of Power Sources,2010,34(8). |
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| Authors: | WANG Bao-guo YANG Chuan-zheng WANG Dan ZHANG Hao XIA Bao-jia HE Dan-nong |
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| Affiliation: | WANG Bao-guo1,YANG Chuan-zheng2,WANG Dan1,ZHANG Hao1,XIA Bao-jia2,HE Dan-nong1(1.National Engineering Research Center for Nanotechnology,Shanghai 200241,China,2.Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China) |
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| Abstract: | The influence of Mo content on the crystal structure,thermodynamics and electrochemical properties of La0.50Pr0.22Nd0.06Mg0.22(Ni0.84-xCo0.15Al0.01Mox)3.5(x=0.00,0.01,0.02,0.03 and 0.04)alloys was studied systematically.The phase structures were identified by X-ray diffraction(XRD).The results show that all these alloys consist of two phases: the main phase is La2Ni7 phase with the Ce2Ni7-type structure and a few phase is LaNi5 with CaCu5-type structure.The value of c /a increases with the increase of Mo co... |
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| Keywords: | hydrogen storage alloy La2Ni7 phase LaNi5 phase PCT electrochemical properties |
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