INFLUENCE OF Fe DOPING ON ELECTROCHEMICAL PROPERTIES OF Ml(Ni,Co,Mn,Ti)5 HYDROGEN STORAGE ALLOY
(Department of Materials Science and Engineering,Zhejiang University, Hangzhou 310027, P. R. China)
Abstract: During the producing of mischmetal and melting of hydrogen storage electrode alloy, the mischmetal and alloy are susceptible to be contaminated by iron. Considering this factor, the effects of doped Fe on electrochemical properties of Ml(Ni,Co,Mn,Ti)5 alloy were systematically studied. Results show that doping trace Fe (≤0.64%) can improve the discharge capacity of the alloy, however, as the content of doped Fe increases from 0.64% to 6.07%, the discharge capacity is degraded gradually. The activation behaviour and cycling stability of the alloy have been enhanced to some degree as the content of doped Fe increases, while the high-rate-dischargeability of the alloy has been deteriorated to some degree.
Key words: Fe doping hydrogen storage electrode alloy electrochemical property