Abstract: LaNi5-based hydrogen storage alloys have wide application prospect in many areas such as gaseous hydrogen storage, hydrogen compressing, Ni/MH batteries etc. Their cycling stability has always been an important problem. In this study, LaNi5.5Sn1.5-C-Si alloy with CaCu5 main phase and a small amount of Ni/Sn phase, C phase and Si phase was prepared by arc melting metallurgical method combined with long time annealing treatment. The evaluation trend in the hydrogen storage performance of the LaNi5.5Sn1.5-C-Si alloy during 1 000 hydrogen absorption/desorption cycles are studied in comparison with LaNi5-base alloys. It is found that with increasing cycle number, the hydrogen storage capacity is slightly decreased, and the hydrogen absorption/desorption plateaus become a little tilted. However, the above changes are far less than that of LaNi5 alloys. LaNi5.5Sn1.5-C-Si alloy preserve a high cycling stability of reach 98% probably because of the buffering effect of the C and Si dispersion phases which relive the pulverization of the alloy particles. Moreover, the alloys have good kinetics performance and can fully absorb hydrogen within 200 s in the temperature range of 383—423 K at 2 MPa. The good hydrogen absorption kinetics may be related to the catalytic effect of the Ni/Sn-rich phase.
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2021, Vol. 35 
