Effect of AB2 alloy addition on the phase structures and electrochemical characteristics of LaNi5 hydride electrode

被引:14
作者
Han, SM [1 ]
Zhao, MS
Zhang, Z
Zheng, YZ
Jing, TF
机构
[1] Yanshan Univ, Dept Environm Chem & Engn, Qinhuangdao 066004, Peoples R China
[2] Chinese Acad Sci, Key Lab Rare Earth Chem & Phys, Changchun 130022, Peoples R China
[3] Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China
基金
中国国家自然科学基金;
关键词
composite hydrogen storage alloy; hypo-stoichiometric AB(5)-type alloy; metal hydride electrode; low-temperature electrochemical characteristics;
D O I
10.1016/j.jallcom.2004.08.091
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
Hypo-stoichiometric AB(5-alpha) (alpha > 0) type alloy LaNi5-x%AB(2) (x = 1, 5,10,20) composite alloys were successfully prepared by sintering the powder mixtures of LaNi5 and AB(2)-type Laves phase alloy Zr0.9Ti0.1(Mn0.35Ni0.55V0.15)(2) as addition. The phase structure and electrochemical characteristics of the composite alloys were investigated by means of XRD, EDS and electrochemical measurements. It was shown that LaNi5-x% AB(2) (x = 1, 5, 10, 20) composite alloys have multi-phase structure, the matrix phase is CaCu5 structure of LaNi5 alloy, the second phase is rich-Zr phase which dispersed in the matrix phase as strips. The discharge capacity and rate-discharge capacity of LaNi5 alloy electrodes were greatly improved after composite treated by adding AB(2) alloy. The maximum discharge capacity of the composite alloy electrodes increased from 188 mAh/g for x = 0 to 305 mAh/g for x = 10, and the rate-discharge capacity of the composite alloy for x = 5 at the current density of 300 mA/g and 2040 mA/g was 97% and 55% of that of the alloy at 60 mA/g, respectively. The electrochemical characteristics of LaNi5 alloy at low temperature were also significantly improved by adding AB(2) alloy. The discharge capacity of LaNi-5% AB(2) composite alloy electrode at 233 K was up to 215 mAh/g. (c) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:268 / 273
页数:6
相关论文
共 12 条
[1]   Study of the corrosion resistance of Cr, Zr, Y doped AB5 type alloys in KOH [J].
Arnaud, O ;
Barbic, P ;
Bernard, P ;
Bouvier, A ;
Knosp, B ;
Riegel, B ;
Wohlfahrt-Mehrens, M .
JOURNAL OF ALLOYS AND COMPOUNDS, 2002, 330 :262-267
[2]   Effects of addition of rare-earth element on electrochemical characteristics of ZrNi1.1Mn0.5V0.3Cr0.1 hydrogen storage alloy electrodes [J].
Chen, WX .
JOURNAL OF ALLOYS AND COMPOUNDS, 2001, 319 (1-2) :119-123
[3]  
Han SM, 2003, CHINESE J INORG CHEM, V19, P262
[4]   The influence of high-rate quenching on the cycle stability and the structure of the AB5-type hydrogen storage alloys with different Co content [J].
Li, CJ ;
Wang, FR ;
Cheng, WH ;
Li, W ;
Zhao, WT .
JOURNAL OF ALLOYS AND COMPOUNDS, 2001, 315 (1-2) :218-223
[5]   ON THE NATURE OF THE ELECTROCHEMICAL CYCLING STABILITY OF NONSTOICHIOMETRIC LANI5-BASED HYDRIDE-FORMING COMPOUNDS .1. CRYSTALLOGRAPHY AND ELECTROCHEMISTRY [J].
NOTTEN, PHL ;
EINERHAND, REF ;
DAAMS, JLC .
JOURNAL OF ALLOYS AND COMPOUNDS, 1994, 210 (1-2) :221-232
[6]   HYDROGEN ABSORPTION DESORPTION CHARACTERISTICS OF MM-NI-AL-M AND MM-NI-MN-M ALLOYS (MM=MISCH METAL) [J].
OSUMI, Y ;
SUZUKI, H ;
KATO, A ;
OGURO, K ;
KAWAI, S ;
KANEKO, M .
JOURNAL OF THE LESS-COMMON METALS, 1983, 89 (01) :287-292
[7]   Effect of V and Zr on the electrochemical properties of La-based AB5-type metal hydride electrodes [J].
Seo, CY ;
Choi, SJ ;
Choi, J ;
Park, CN ;
Lee, JY .
JOURNAL OF ALLOYS AND COMPOUNDS, 2003, 351 (1-2) :255-263
[8]   The influence of titanium on the electrochemical properties of the AB5-type metal hydrides [J].
Seo, CY ;
Choi, SJ ;
Choi, J ;
Park, CN ;
Lee, PS ;
Lee, JY .
JOURNAL OF ALLOYS AND COMPOUNDS, 2003, 350 (1-2) :324-331
[9]   Effect of Ti and Zr additions on the characteristics of AB5-type hydride electrode for Ni-MH secondary battery [J].
Seo, CY ;
Choi, SJ ;
Choi, J ;
Park, CN ;
Lee, PS ;
Lee, JY .
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2003, 28 (03) :317-327
[10]   Influence of various additives in vanadium-based alloys V3TiNi0.56 on secondary phase formation, hydrogen storage properties and electrode properties [J].
Tsukahara, M ;
Takahashi, K ;
Mishima, T ;
Isomura, A ;
Sakai, T .
JOURNAL OF ALLOYS AND COMPOUNDS, 1996, 245 :59-65