Investigation on the structure and electrochemical properties of the laser sintered La0.7Mg0.3Ni3.5 hydrogen storage alloys

被引：30
作者：
Si, T. Z. [1 ,2 ]
Zhang, Q. A. [1 ]
Liu, N. [2 ]
机构：
[1] Anhui Univ Technol, Sch Mat Sci & Engn, Maanshan 243002, Anhui, Peoples R China
[2] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2008年 / 33卷 / 06期
关键词：
laser sintering; La0.7Mg0.3Ni3.5; alloy; microstructure; electrochemical property;
D O I：
10.1016/j.ijhydene.2008.01.001
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The structure and electrochemical properties of the La0.7Mg0.3Ni3.5 alloys laser sintered at different powers were investigated. It is found that all alloys contain three phases La3MgNi14 with the Ce2Ni7 structure, LaNi5 and LaMgNi4. The abundance of the main phase La3MgNi14 is 43, 68 and 63 wt%, respectively, when sintering power varies from 1000 to 1200 and 1400 W. The laser sintered La0.7Mg0.3Ni3.5 alloys can be activated to their maximum discharge capacity within three cycles. The discharge capacities of those alloys prepared by laser sintering at 1000, 1200 and 1400 W are 324.6, 352.8 and 340.5 mAh/g, respectively. The La0.7Mg0.3Ni3.5 alloy laser sintered at 1200 W has a best cyclic stability (S-100 = 58.4%) and high-rate dischargeability (HRD800 = 79.4%) due to the high amount of the main phase La3MgNi14. (c) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1729 / 1734
页数：6
相关论文
共 23 条
[1]   Hydrogen storage alloys with PuNi3-Type structure as metal hydride electrodes [J].
Chen, J ;
Kuriyama, N ;
Takeshita, HT ;
Tanaka, H ;
Sakai, T ;
Haruta, M .
ELECTROCHEMICAL AND SOLID STATE LETTERS, 2000, 3 (06) :249-252
[2]   Synthesis, crystal structure and hydrogenation properties of the ternary compounds LaNi4Mg and NdNi4Mg [J].
Guénée, L ;
Favre-Nicolin, V ;
Yvon, K .
JOURNAL OF ALLOYS AND COMPOUNDS, 2003, 348 (1-2) :129-137
[3]   Crystal structures of La-Mg-Nix (x=3-4) system hydrogen storage alloys [J].
Hayakawa, H ;
Akiba, E ;
Gotoh, M ;
Kohno, T .
MATERIALS TRANSACTIONS, 2005, 46 (06) :1393-1401
[4]   A Rietveld-analysis program RIETAN-98 and its applications to zeolites [J].
Izumi, F ;
Ikeda, T .
EUROPEAN POWDER DIFFRACTION, PTS 1 AND 2, 2000, 321-3 :198-203
[5]   Synthesis and structure determination of a new series of hydrogen storage alloys; RMg2Ni9 (R=La, Ce, Pr, Nd, Sm and Gd) built from MgNi2 laves-type layers alternating with AB(5) layers [J].
Kadir, K ;
Sakai, T ;
Uehara, I .
JOURNAL OF ALLOYS AND COMPOUNDS, 1997, 257 (1-2) :115-121
[6]   Structural investigation and hydrogen storage capacity of LaMg2Ni9 and (La0.65Ca0.35)(Mg1.32Ca0.68)Ni9 of the AB2C9 type structure [J].
Kadir, K ;
Sakai, T ;
Uehara, I .
JOURNAL OF ALLOYS AND COMPOUNDS, 2000, 302 (1-2) :112-117
[7]   Hydrogen storage properties of new ternary system alloys:: La2MgNi9, La5Mg2Ni23, La3MgNi14 [J].
Kohno, T ;
Yoshida, H ;
Kawashima, F ;
Inaba, T ;
Sakai, I ;
Yamamoto, M ;
Kanda, M .
JOURNAL OF ALLOYS AND COMPOUNDS, 2000, 311 (02) :L5-L7
[8]   A study on the structure and electrochemical properties of La2Mg(Ni0.95M0.05)9 (M = Co, Mn, Fe, Al, Cu, Sn) hydrogen storage electrode alloys [J].
Liao, B ;
Lei, YQ ;
Chen, LX ;
Lu, GL ;
Pan, HG ;
Wang, QD .
JOURNAL OF ALLOYS AND COMPOUNDS, 2004, 376 (1-2) :186-195
[9]   The electrochemical properties of LaxMg3-xNi9 (x=1.0-2.0) hydrogen storage alloys [J].
Liao, B ;
Lei, YQ ;
Lu, GL ;
Chen, LX ;
Pan, HG ;
Wang, QD .
JOURNAL OF ALLOYS AND COMPOUNDS, 2003, 356 :746-749
[10]   Effect of the La/Mg ratio on the structure and electrochemical properties of LaxMg3-xNi9 (x=1.6-2.2) hydrogen storage electrode alloys for nickel-metal hydride batteries [J].
Liao, B ;
Lei, YQ ;
Chen, LX ;
Lu, GL ;
Pan, HG ;
Wang, QD .
JOURNAL OF POWER SOURCES, 2004, 129 (02) :358-367
123