TITLE

Effects of the stoichiometric ratio of aluminium and manganese on electrochemical properties of hydrogen storage alloys

AUTHOR(S)
Wu, M.-S.; Wu, H.-R.; Wang, Y.-Y.; Wan, C.-C.
PUB. DATE
July 2003
SOURCE
Journal of Applied Electrochemistry;Jul2003, Vol. 33 Issue 7, p619
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
With the aim of enhancing the capacity and electrochemical performances of hydrogen-storage alloy electrodes, MmM4.3(Al0.3Mn0.4)x (Mm = La-rich mischmetal, M = Ni, Co) alloys were investigated. MmM4.3(Al0.3Mn0.4)x alloys possessing appropriate plateau pressure and high storage capacity can be obtained by adjusting the stoichiometric ratio of Al–Mn (x value). In this situation, the unit cell volumes increase with increasing x and the enthalpy changes of hydride formation decrease with increasing x, thereby changing the alloy properties in the gas phase and the electrochemical environment. The plateau pressure and the charge potential both increase with decreasing x. The x value influences the surface states and bulk properties. When x is lower than 0.5, both the charge-transfer reaction on the alloy surface and the diffusion resistance within the bulk alloy are much improved. High-rate dischargeability at high current density is controlled mainly by the limiting current density. MmM4.3(Al0.3Mn0.4)0.5 alloy, having the highest storage capacity and good electrochemical performance, is an appropriate candidate for battery materials.
ACCESSION #
16781782

 

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