An improvement on cycling stability of Ti-V-Fe-based hydrogen storage alloys with Co substitution for Ni
作者： He Miao , Mingxia Gao , Yongfeng Liu , Dan Zhu , Hongge Pan
DOI: 10.1016/J.JPOWSOUR.2008.02.065
关键词:
摘要: Abstract In this work, the effects of Co substitution for Ni on microstructures and electrochemical properties Ti 0.8 Zr 0.2 V 2.7 Mn 0.5 Cr 0.6 1.25− x Fe ( = 0.00–0.25) alloys were investigated systematically by XRD, SEM measurements. The structural investigations revealed that main phases all C14 Laves phase in a three-dimensional network V-based solid solution with dendritic structure. lattice parameters unit cell volumes two gradually increased increase concentration. relative abundance slightly from 47.3% to 49.6%, accordingly decreased, 0.00 0.25. crystal grain was obviously refined after substitution. showed proper improved cycling durability alloy electrodes mainly due suppression both pulverization particles dissolution hydrogen absorbing elements (V Ti) into KOH solution. stability electrode = 0.1 79.8% 200 cycles. However, maximum discharge capacity C max ) decreased 340.5 305.6 mAh g −1 , high rate dischargeability (HRD) 66.8% 55.0% increasing
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