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Surface Structure and Electrochemical Characteristics of Ti-V-Cr BCC-Type Solid Solution Alloys Sintered with NI

Published online by Cambridge University Press:  10 February 2011

Yoichiro Tsuji
Affiliation:
Central Research Laboratory, Matsushita Electric Industrial Co., Ltd., Osaka, Japan
Osamu Yamamoto
Affiliation:
Central Research Laboratory, Matsushita Electric Industrial Co., Ltd., Osaka, Japan
Hiromu Matsuda
Affiliation:
Central Research Laboratory, Matsushita Electric Industrial Co., Ltd., Osaka, Japan
Yoshinori Toyoguchi
Affiliation:
Central Research Laboratory, Matsushita Electric Industrial Co., Ltd., Osaka, Japan
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Abstract

Ti-V-Cr bcc-type solid solution alloys can absorb a large amount of hydrogen and be applied to active materials of the negative electrode in Ni-MH batteries. However, because of the insolubility of Ni into these alloys, the electrochemical characteristics like discharge capacity and cycle life were poor. In order to increase the discharge capacity of hydrogen absorbing alloy electrodes, Ti-V-Cr bcc-type alloy powders were sintered with Ni in order to form Ni contained surface layer on the alloy surface. As sintering temperature rose up, the surface composition changed from TiNi to Ti2Ni. TiNi surface layer showed better electrochemical characteristics. For the Ni adding method, Ni electroless plating was preferred because of good adhesion. As a result of optimized conditions, a discharge capacity of 570 mAh/g and an improvement of cycle life were achieved.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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References

REFERENCES

1. Ogawa, H., Ikoma, M., Kawano, H., Matsumoto, I., Power Sourc., 12, 393(1989).Google Scholar
2. Sakai, T., Muta, K., Miyamura, H., Kuriyama, N., Ishikawa, H., J. Alloys Comp., 180 37(1992).Google Scholar
3. Moriwaki, Y., Gamo, T., Seri, H., Iwaki, T., J. Less-Common Met., 172174, 1211 (1991).Google Scholar
4. Zuttel, A., Meli, F., Schlapbach, L., J. Alloys Comp., 203, 235(1994).Google Scholar
5. Libowitz, G. G., Maeland, A. J., Material Sci. Forum, 31 177(1988).Google Scholar
6. Lee, H. H., Lee, K. Y., Lee, J. Y, J. Alloys Comp., 239, 63(1996).Google Scholar
7. Reilly, J. J., Wiswall, R. H., Inorg. Chem., 9, 1678(1970).Google Scholar
8. Tsukahara, M., Takahashi, K., Mishima, T., Sakai, T., Miyamura, H., Kuriyama, N., Uehara, I., J. Alloys Comp., 226 203(1995).Google Scholar
9. Kim, D.M., Lee, K.Y., Lee, J.Y., J. Alloys Comp., 231, 650(1995)Google Scholar