Structure and electrochemical performance of hydrogen storage alloy La0.7Mg0.3Ni2.875Co0.525Mn0.1-boron composite

稀有金属（英文版）, 2006, 25(z1): 261-265.

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1.Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China

2.Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China

3.Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China

4.Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China

5.Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China

6.Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China

7.Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China

基金项目: 国家自然科学基金(20573058)

Structure and electrochemical performance of hydrogen storage alloy La0.7Mg0.3Ni2.875Co0.525Mn0.1-boron composite

Keywords： AB3 type hydrogen storage alloys

The structure and electrochemical characteristics of La0.7Mg0.3Ni2.875Co0.525Mn0.1-boron composite was studied systematically. The AB3 type hydrogen storage alloys La0.7Mg0.3Ni2.875Co0.525Mn0.1 were successfully synthesized by means of inter-media alloy La2Mg17 . The alloys were composited with boron at different weight rate. From the XRD analyses, each alloy of this series is mainly composed of (La,Mg)Ni3 phase and the LaNi5 phase, and the phase abundance of each phase varies with the boron weight rate, moreover, after composition, the c and cell volumes of (La,Mg)Ni3 phase increase, and the LaNi5 phase keep the same, which indicate that the boron may enter (La,Mg)Ni3 phase. The electrochemical studies show that the maximum discharge capacity of the composites decreases, but the cycling life improved. And the high rate discharge ability and exchange impendence spectroscopy (EIS) of the AB3 alloys and its composite were also studied.

参考文献

[1]	Willems J J G .Metal hydride electrodes stability of LaNi5-related compounds[J].Philips Journal of Research,1984,39(z1):1.
[2]	Liao B;Lei Y Q;Chen L X et al.Effect of the La/Mg ratio on the structural and electrochemical properties of LaxMg3-xNi9(x=1.6-2.2)hydrogen storage electrode alloys for nickel-metal hydride batteries[J].Journal of Power Sources,2004,129:358.
[3]	Han M S;Zhou S M;Zhang Z et al.Effect of AB2 alloy addition on the phase structures and electrochemical characteristics of LaNi5 hydride electrode[J].Journal of Alloys and Compounds,2005,392:268.
[4]	Liu F J;Suda S .F-treatment effect on the hydriding properties of the La-substituted AB2 compound(Ti,Zr)(Mn,Cr,Ni)2[J].Journal of Alloys and Compounds,1995,231:666.
[5]	Tsukahara M;Takahashi K;Mishima T et al.Metal hydride electrodes based on solid solution type alloy TiV3Nix(0＜ x＜0.75)[J].Journal of Alloys and Compounds,1995,226:203.
[6]	Reilly J J;Wiswall R H .Reaction of hydrogen with alloys of magnesium and nickel and the formation of Mg2NiH4[J].Inorganic Chemistry,1968,7:2254.
[7]	Liu W H;Lei Y Q;Sun D L et al.A study of the degradation of the electrochemical capacity of amorphous Mg50Ni50 alloy[J].Journal of Power Sources,1996,58:243.
[8]	Liu J W;Jiao L F;Yuan H T et al.Effect of discharge cut off voltage on cycle life of MgNi-based electrode for rechargeable Ni-MH batteries[J].Journal of Alloys and Compounds,2005,403:270.
[9]	Kadir K;Sakai T;Uehara I .Synthesis and structure determination of a new series of hydrogen starage alloys:RMg2Ni9(R=La,Ce,Pr,Nd,Sm and Gd)built from MgNi2 Laves-type alternating with AB5 layers[J].Journal of Alloys and Compounds,1997,257:115.
[10]	Kadir K;Kuriyama N;Sakai T et al.Structural investigation and hydrogen capacity of CaMg2Ni9:a new phase in AB2C9 system isostructural with LaMg2Ni9[J].Journal of Alloys and Compounds,1999,284:145.
[11]	Kadir K;Sakai T;Uehara I .Structural investigation and hydrogen capacity of LaMg2Ni9 and(La0.65Ca0.35)(Mg1.32Ca0.68)Ni9 of the AB2C9 type structure[J].Journal of Alloys and Compounds,2000,302:112.
[12]	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.
[13]	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.
[14]	Hongge Pan;Yongfeng Liu;Mingxia Gao .Structural and Electrochemical Properties of the La_(0.7)Mg_(0.3)Ni_(2.975-x)Co_(0.525)Mn_x Hydrogen Storage Electrode Alloys[J].Journal of the Electrochemical Society,2004(3):A374-A380.
[15]	Pan H G;Liu Y F;Gao M X et al.A study of the structural and electrochemical properties of La0.7Mg0.3(Ni0.85Co0.15)x(x=2.5～5.0)hydrogen storage electrode alloys[J].Journal of the Electrochemical Society,2003,150:A565.
[16]	Zhang YH;Dong XP;Wang GQ;Guo SH;Rena JY;Wang XL .Effect of boron addition on the microstructure and electrochemical performance of La2Mg(Ni(0.85)Co0.15)(9) hydrogen storage alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1-2):219-225.
[17]	Kuriyama N;Sakai T;Miyamura H et al.Electrochemical impedance and deterioration behavior of metal hydride electrodes[J].Journal of Alloys and Compounds,1993,202:183.

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Structure and electrochemical performance of hydrogen storage alloy La0.7Mg0.3Ni2.875Co0.525Mn0.1-boron composite

参考文献