|
|
Effects of Cu-P Coatings on Electrochemical Properties of La0.75Mg0.25Ni3.2Co0.2Al0.1 Hydrogen Storage Alloy Electrode |
WANG Rui-fen1,2,3, ZHANG Yin1,2, XU Jian-yi1,2, ZHANG Yang-huan1 |
1. School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China;
2. Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi-Metallic Resources Elected State Key Laboratory, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China;
3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
|
|
Abstract A2B7-type La0.75Mg0.25Ni3.2Co0.2Al0.1 hydrogen storage alloy was coated by means of chemical plating. The effects of Cu coatings on the electrochemical properties of the hydrogen storage alloy were studied at different temperatures systematically. The results show that the cycling stability of the electrode is improved. The Cu coated powder electrode is better than bare electrode in exchange current density I0, high rate discharge ability and hydrogen diffusion coefficient D with increasing reaction temperature. The maximum discharge capacity of alloy electrodes decreases.
|
Received: 15 March 2012
Published: 20 May 2013
|
|
|
|
|
[1] KURIYAMA N,SAKAI T, MIYAMURA H, et al. Electrochemical impedance and deterioration behavior of metal hydride electrodes[J]. J Alloys Compd, 1993,202(1-2):183-197.[2] KOHNO T, YOSHIDA H, KAWASHIMA F, et al. Hydrogen storage properties of new ternary system alloys: La2MgNi9,La5Mg2Ni23,La3MgNi14[J]. J Alloys Compd, 2000,311(2):5-7.[3] ZHANG Fa-liang, LUO Yong-chun, CHEN Jiang-ping, et al. Effect of annealing treatment on structure and electro-chemical properties of La0.67Mg0.33Ni2.5Co0.5 alloy electrodes[J]. Journal of Power Sources,2005,150(4):247-254.[4] KURIYAMA N,SAKAI T. Evaluation of methods to improve reproducibility in charge/discharge measurements of metal hydride battery electrodes[J]. J Alloys Compounds, 2002, 330-332:771-775.[5] KADIR K, KURUYAMA N, SAKIA T, et al. Structural investigation and hydrogen capacity of CaMg2Ni9: a new phase in the AB2C9 system isostructural with LaMg2Ni9[J]. J Alloys Compd, 1999,284(1-2):145-154.[6] 朱春玲,阎汝煦,王大辉,等.表面包覆镍处理La0.67Mg0.33Ni2.5-Co0.5贮氢合金电极的电化学性能[J].稀有金属材料与工程,2006,35(4):573-576. ZHU Chun-ling,YAN Ru-xu, WANG Da-hui,et al. Effects of Ni-P coatings on the electrochemical properties of the La0.67-Mg0.33Ni2.5Co0.5 hydrogen storage alloy electrode[J]. Rare Metal Materials and Engineering,2006,35(4):573-576.[7] ZHANG Y H, DONG X P, WANG G Q, et al. Effect of rapid quenching on microstructures and electrochemical performances of La2Mg(Ni0.85Co0.15)9M0.1(M=B, Cr) hydrogen storage alloys[J]. Journal of Rare Earths, 2005, 23(4): 460-465.[8] 李晓峰,李加勇,董会超.储氢合金表面包覆铜对MH-Ni电池性能的影响[J].电源技术,2009,133(3):185-187. LI Xiao-feng, LI Jia-yong, DONG Hui-chao. Effects of metal copper coated hydrogen absorbing alloy on self-discharge performance of Ni-MH batteries[J]. Chinese Journal of Power Sources, 2009,133(3):185-187.[9] AKIBA E, HAYAKAWA H, KOHNO T. Crystal structures of novel La-Mg-Ni hydrogen absorbing alloys[J]. J Alloys and Compd,2006, 408-412: 280-283.[10] 田晓光,周东辉.化学镀铜对A2B7型贮氢合金电极电化学性能的影响[J].科学技术与工程,2010,10(1):52-56. TIAN Xiao-guang, ZHOU Dong-hui. Electrochemical properties studies on chemical copper microencapsulating for La-Mg-Ni system A2B7 type hydrogen storage alloy[J]. Science Technology and Engineering, 2010,10(1):52-56.[11] LIAO B, LEI Y Q, LU G L, et al. The electrochemical properties of LaxMg3-xNi9 (x=1.0-2.0) hydrogen storage alloys[J]. J Alloys and Compd, 2003, 356-357:746-749.[12] 蔡秀娟.表面包覆La-Mg-Ni系A2B7型贮氢电极合金的电化学性能研究[D].兰州:兰州理工大学,2007.53. [13] YUAN Xian-xia, XU Nai-xin. Application of theoretical model to research and development of hydrogen storage alloy [J]. J Appl Electrochem, 2001, 31(9):10-27.[14] KURIYAMA N, SAKAI T, MIYAMURA H, et al. Electrochemical impedance spectra and deterioration mechanism of metal hydride electrodes [J]. J Electrochem Soc, 1992, 139(7):72-73.[15] LIU Yong-feng, PAN Hong-ge, GAO Ming-xia, et al.The effect of Mn substitution for Ni on the structural and electrochemical properties of La0.7Mg0.3Ni2.55-xCo0.45Mnx hydrogen storage electrode alloys[J]. J Alloys and Compounds, 2004, 29(3):297-305.[16] PAN Hong-ge, LIU Qin-wei, GAO Ming-xia, et al. Effect of the cerium content on the structural and electrochemical properties of the La0.7-xCexMg0.3Ni2.875Mn0.1Co0.525 (x=0-0.5) hydrogen storage alloys[J]. J Alloys and Compounds,2004,373(1-2):237-245.[17] KOHNO T, YOSHIDA H, KANDA M. Hydrogen storage properties of La(Ni0.9M0.1)3 alloys[J]. J Alloys and Compounds, 2004, 363(1-2): 254-257. |
|
|
|