为了改善La-Mg-Ni-Co系合金电极的循环稳定性,对铸态合金La0.75Mg0.25Ni3.5 Co0.4在0.3MPa压力氩气保护下进行不同温度的退火(1123,1223和1323K),保温时间均为10h.研究了退火温度对合金的电化学性能的影响.X射线衍射(XRD)分析结果表明,铸态及1123K温度退火后合金主要由LaNi5,(La,Mg)2(Ni,Co)7相以及少量LaNi2相组成;退火温度为1223和1323K时,合金中LaNi2相消失,合金主要由LaNi5,(La,Mg)2(Ni,Co)7及(La,Mg)(Ni,Co)3相组成.随退火温度升高,最大放电容量从341.2mAh/g增加365.8mAh/g;循环稳定性得到改善,100次充放电循环后容量保持率从铸态合金的58.63%提高到1323K时的72.91%.
参考文献
| [1] | 李克杰,李全安,李守英,张清,张兴渊,文九巴.稀土Dy和Sm对贮氢合金微观结构和电化学性能的影响[J].材料热处理学报,2006(06):18-20. |
| [2] | Kim DM;Lee J.-Y. --;Jang K.-J. -- .Review on the development of AB sub 2 -type Zr-based Laves phase hydrogen storage alloys for Ni-MH rechargeable batteries in the Korea Advanced Institute of Science and Technology[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,1999(0):583-592. |
| [3] | 蒙冕武,刘心宇,周怀营.Structural and Electrochemical Characteristics of Mg0.94La0.06Ni Alloy Prepared by Ball Milling[J].稀土学报（英文版）,2004(05):673-677. |
| [4] | K.Kadir;T.Sakai .Structural investigation and hydrogen capacity of Ymg2Ni9 and (Y0.5Ca0.5)(MgCa)Ni9: new phases in the AB2C9 system isostructural with LaMg2Ni9[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,1999(1/2):264-270. |
| [5] | Zhang Yanghuan;Dong Xiaoping;Wang Guoqing .Effect of Rapid Quenching on Microstructures and Electrochemical Performances of La_2Mg(Ni_(0.85)Co_(0.15))_9]M_(0.1) ( M = B, Cr) Hydrogen Storage Alloys[J].Journal of Rare Earths,2005(4):460-465. |
| [6] | B. Liao;Y. Q. Lei;G. L. Lu .The electrochemical properties of La_xMg_(3-x)Ni_9 (x= 1.0-2.0) hydrogen storage alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2003(0):746-749. |
| [7] | J. Chen;N. Kuriyama;H. T. Takeshita;H. Tanaka;T. Sakai;M. Haruta .Hydrogen Storage Alloys with PuNi_3-Type Structure as Metal Hydride Electrodes[J].Electrochemical and solid-state letters,2000(6):249-252. |
| [8] | ZHENG Xue-ping;LI Ping;QU Xuan-hui et al.Study on structure and electrochemical properties of La0.17Mg0.3Ni2.98Co0.52 hydrogen storage alloy[J].Journal of Rare Earths,2005,23(zk):350-352. |
| [9] | Kohno T.;Yoshida H. .Hydrogen storage properties of new ternary system alloys: La_2MgNi_9, La_5Mg_2Ni_(23), La_3MgNi_(14)[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2000(2):L5-L7. |
| [10] | WANG Da-hni;LUO Yong-ehun;YAN Ru-xu et al.Phase structure and electrochemical properties of La0.67Mg0.33Ni3.0-xCo,x(x=0,0.25,0.5,0.75) hydrogen storage[J].Journal of Alloys and Compounds,2006,413:193-197. |
| [11] | Pan H G;Liu Y F;Gao M X et al.A studyofthe structural and electrochemieal properties of La0.7Mg0.3(Ni0.85Co0.15),(x=2.5-5.0) hydrogen storage alloys[J].Journal of Electrochemcal Science,2003,150(05):A565-A570. |
| [12] | Dunlap B D;Viecaro P J;Shenoy G K .Structural relationshipe in rare earth-transition metal hydrides[J].J Less Commen Met,1980,74:75-79. |
| [13] | Akiba E;Hayakawa H;Kolmo T .Crystal structures of novel La-Mg-Ni hydrogen absorbing alloys[J].Journal of Alloys and Compounds,2006,408-412(280-283) |
| [14] | Nomuram K;Uruno H;Ono S et al.Effects of lattice strain on the hysteresis of pressure-composition isotherms for the LaNi5-H2 system[J].J Less Commen Met,1985,107:221-230. |
| [15] | Kisi E H;Buckley C E;Gray E M .The bydrogen activetion of LaNi5[J].Journal of Alloys and Compounds,1992,185:369-384. |
| [16] | Nakamura Y;Nakamura H;Fujiteni S .Homogenizing hehaviour in a hydrogen-absorbing LaNi4.55 Al0.45 alloy through annealing and rapid quenching[J].Journal of Alloys and Compounds,1994,210:299-303. |
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