✦ LIBER ✦

Effect of the stoichiometric ratio on electrochemical properties of hydrogen storage alloys for nickel-metal hydride batteries

✍ Scribed by Yukio Fukumoto; Masayoshi Miyamoto; Masao Matsuoka; Chiaki Iwakura

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 364 KB
Volume: 40
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(94)00356-6

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✦ Synopsis

Effect of stoichiometric ratio on the electrochemical properties of negative electrodes was investigated for alloys with composition Mm(Ni,,,Mno.4Al,,,Co~,,), (Mm = misch metal, 0.88 < x < 1.12). The discharge capacity at a current density of 0.2Ag-' increased with an increase in unit cell volume of the alloys in the range of x = 0.96-1.12. The discharge eficiency increased with increasing x value, and was about 85.2% even at a high current density of ca 2Ag-' in the case of x = 1.12. The improved high-rate dischargeability was explained on the basis of high diffusibility of hydrogen in the bulk of alloys as the result of the relatively low stability of the hydride, in addition to the high electrocatalytic activity for the hydrogen electrode reactions of the negative electrode.

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