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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 2    April 2003

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Preparation of low cobalt high rate discharge
hydrogen storage alloy MlNi3.85Co0.45Mn0.4Al0.3X0.1(X=Mg,Si,Sn)
LIU Kai-yu(刘开宇), ZHANG Ping-min(张平民), TANG You-gen(唐有根)

College of Chemistry and Chemical Engineering, 
Central South University, Changsha 410083, China

Abstract:The non-stoichiometric high rate discharge hydrogen storage alloys series MlNi3.85Co0.45Mn0.4Al0.3X0.1(Ml represents the lanthanum-rich mischmetal, and X=Mg,Si,Sn) were prepared. The XRD and EDS results show that the high catalysis active miscellaneous La2Ni7phase forms except for main phase LaNi5 in the alloy body. The high rate discharge performance of hydrogen storage alloys electrode was improved because of the formation of La2Ni7 phase. The discharge capacities at 0.2C, 1C and 5C discharge rate reach 320mAh·g-1, 300mAh·g-1and 260mAh·g-1respectively when X is (Mg+Si). At the same scanning rate of circular volt—ampere testing, the surface anode oxidation peak current and peak area of the alloy containing (Mg+Si) electrode are far more larger than that of the high cobalt alloy MlNi3.55Co0.75Mn0.4Al0.3(AB5). Furthermore, the cobalt content of the hydrogen storage alloy containing (Mg+Si) decreases by 40% and the high rate discharge performance improves obviously compare to high cobalt AB5 alloys, it is promising that the hydrogen storage alloy containing (Mg+Si) becomes to an ideal dynamic battery cathode material.

 

Key words:   low cobalt; high rate discharge; hydrogen storage alloys; (Mg+Si); preparation 

ISSN 1672-7029
CN 43-1423/U

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