Sn替换Co对AB_5型La_(0.7)Mg_(0.3)Al_(0.3)Mn_(0.4)Co_(0.5-x)Sn_xNi_(3.8)(x=0-0.5)合金显微结构和电化学性能的影响(英文) |
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作者姓名: | Julio Cesar Serafim CASINI Zai-ping GUO Hua Kun LIU Eliner Affonso FERREIRA Rubens Nunes FARIA Hidetoshi TAKIISHI |
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作者单位: | Institute for Semiconducting and Electronic Materials, University of Wollongong;Materials Science and Technology Center, Nuclear and Energy Research Institute,University of Sao Paulo |
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基金项目: | Institute for Superconducting and Electronic Materials (ISEM);University of Wollongong and Institute Nuclear and Energy Research (IPEN);University of Sao Paulo for the financial support;National Council for Scientific and Technological Development – CNPQ – Brazil for the scholarships;financial support (CNPQ 472504/2010-0) granted to Julio Cesar Serafim CASINI |
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摘 要: | 采用X射线衍射方法、压力-成分等温线、电化学放电循环研究了AB5型La0.7Mg0.3Al0.3Mn0.4Co0.5-xSnxNi3.8(x=0,0.1,0.2,0.3,0.5)合金中用Sn替换Co对其显微结构、储氢性能和电化学放电容量的影响。XRD、SEM及EDS测试结果表明,所有的合金都主要由La Ni5和Mg Ni2相组成,但随着合金中Sn含量的逐渐增加,出现LaNiSn相且显微结构得到细化。压力-成分等温线表明,随着合金中Sn含量的增加,合金的最大储氢容量从1.48%(x=0)降低到0.85%(x=0.5)。电化学测试结果表明,随着合金中Sn含量的增加,合金的最大放电容量从337.1 mA·h/g(x=0)降低到249.8 mA·h/g(x=0.5);充放电循环100次的放电容量保持率从70.2%(x=0)增加到78.0%(x=0.5)。
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关 键 词: | 储氢合金 显微组织 镍氢电池 Sn Co 取代 |
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