Effect of Ni content on rate capability of Mg0.9Ti0.06V0.04Nix negative electrodes for nickel/metal hydride batteries

Mg0.9Ti0.06V0.04Nix (x = 1.0-1.3) alloys were prepared by mechanical alloying and their charge-discharge characteristics were investigated with structural characteristics. Maximum discharge capacity obtained at the 1st cycle was decreased with an increase in Ni content, while cycle performance was i...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2004, Vol.151 (7), p.A939-A943
Main Authors: INOUE, Hiroshi, IDEN, Hiroshi, SHIN-YA, Ryuji, NOHARA, Shinji, IWAKURA, Chiaki
Format: Article
Language:English
Subjects:
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
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Summary:Mg0.9Ti0.06V0.04Nix (x = 1.0-1.3) alloys were prepared by mechanical alloying and their charge-discharge characteristics were investigated with structural characteristics. Maximum discharge capacity obtained at the 1st cycle was decreased with an increase in Ni content, while cycle performance was improved due to the suppression of surface oxidation. High-rate dischargeability (HRD) was also markedly improved with increasing Ni content. In particular, the Mg0.9Ti0.06V0.04Ni1.3 negative electrode showed HRD of 65% even at 1 A g-1. From the results of differential chronopotentiometry and differential thermal and thermogravimetric analyses, it was suggested that hydrogen in the amorphous phase of the alloy was destabilized, leading to the accelerated hydrogen diffusion. This is likely to be a factor for the marked improvement of HRD.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.1753578