EFFECT OF ANNEALING ON THE ELECTRODE PERFORMANCES OF ZrTi(MnVCoNi)_2 HYDROGEN STORAGE ALLOY |
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| Authors: | X.G Yang Q.A. Zhang K. Y Shu YL. Du YQ. Lei Q.D. Wang W.K. ZhangG.L. Lu |
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| Affiliation: | X.G,Yang,Q.A. Zhang,K. Y Shu,YL. Du,YQ. Lei and Q.D. Wang (Department of Materials Science and Engineering,Zhejiang University,Hangzhou,China )W.K. Zhang(Department of Applied Chemistry,Zhejiang University of Technology,Hangzhou l,China )G.L. Lu(Central Lab,Zhejiang University,Hangzhou,China) |
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| Abstract: | The annealing treatment was found to improve the cyclic stability but to degmde discharpe capacity, activation and high-rate discharpeability for the Ti-substituted AB2type alloy electrode. A larper polarization was found in the annealed alloy because of its poor discharpe kinetics resulted hem the structural homogeneity. At larae discharpe cumnts, the hydmpen dchsion in the bulk of the alloy was mpaofed as the mte-determining step. Based on the P ressure-composition isotherm measurement, we concluded that the decrease in discharpeability of the annealed alloy is owing to the low and flat pressure plateau, as well as the large hysteresis, but the hydrgen stomge density almost remains unchangeable after annealing. |
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| Keywords: | AB_2 hydrogen storage alloy annealing electrochemical property homogeneity P-C-T |
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