Microstructure and Electrochemical Properties of La_0.75Mg_0.25Ni_3.5(TiNi₃)_0.1 Hydrogen Storage Alloys

Abstract:

La_0.75Mg_0.25Ni_3.5(TiNi₃)_0.1 alloys were prepared by induction melting followed by annealing treatment at 1173Kand 1h,2h,5h,12h,respectively. Alloys structure and electrochemical properties have been studied systematically by X-ray diffraction(XRD) with the Rietveld methold , Electron probe micro-analyzer (EPMA)and electrochemical experiments. Alloys structure analyses showed that all of the alloys mainly consisted of complex phases such as LaNi5 phase (CaCu₅-type,SG: P6/mmm), (La ,Mg)2Ni7 phase (Ce₂Ni₇-type, SG: P6₃/mmc)and (La,Mg)2Ni7 phase(Gd₂Co₇-type,SG: R-3m). Annealed treatment was benefited to the formation of (La ,Mg)2Ni7 phase. Annealed time was imprtant for the alloys microstructure, for the alloys with annealed for 1 hour,the microstructure between main phase and TiNi₃ phase was three-dimensional network,with the annealed time incresed,the TiNi₃ phase became reunite. The microstructure of three-dimensional network was useful for the electrochemical cycle stability of alloys electrodes(S₁₀₀=87%).

• Periodical: Advanced Materials Research (Volumes 287-290)
• Pages: 2526-2530
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.287-290.2526
• Online since: July 2011
• Authors: An Qiang Deng, Jing Bo Fan, Peng Yuan Yang
• Keywords: Electrochemical Property, Hydrogen Storage Alloys, La_0.75Mg_0.25Ni_3.5(tini₃)_0.1, Microstructure

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