Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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The Effect of F-treatment on the Degradation Behavior of the $CaNi_{5}$ and MG-$CaNi_{5}$ Electrodes

$CaNi_{5}$ 및 MG-$CaNi_{5}$ 전극의 퇴화거동에 미치는 불화처리의 영향

  • Lee, C.R. (Dept. Materials Engineering, Hanyang University) ;
  • Oh, S.J. (Dept. Materials Engineering, Hanyang University) ;
  • Kang, S.G. (Dept. Materials Engineering, Hanyang University)
  • 이창래 (한양대학교 공과대학 재료공학과) ;
  • 오세진 (한양대학교 공과대학 재료공학과) ;
  • 강성군 (한양대학교 공과대학 재료공학과)
  • Published : 1999.06.01
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Abstract

Effects of the fluorination in the $K_2$TiF\ulcorner solution and in-situ KF+ KOH electrolyte on the electrochemical charge-discharge properties of CaNi\ulcorner and the Mg-CaNi\ulcorner electrodes were investigated. In-situ fluorination in the KF+ KOH electrolyte compared with pre-fluorination in the$ K_2$TiF\ulcorner solution could improve the electrochemical cycling durability of CaNi\ulcorner and MG-CaN\ulcorner electrodes. The fluorinated layer on the alloy surface by pre-fluorination to improve the activity and anti-corrosion of the electrodes was dissolved in the pure KOH electrolyte during the cycling. The fluorinated layer was formed continuously on the surface of the electrode by thee2N KF addition in the 6N KOH electrolyte. The excess F\ulcorner ion addition in KOH electrolyte could improve the electrochemical cycling durability of CaNi\ulcorner and Mg-CaNi\ulcorner electrode. But, in case of MG-CaNi\ulcorner electrode, the discharge capacity of the electrode was reduced and the poor cycling property was shown with increasing of the MG process times.

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References

  1. Hydrogen Storage Alloys : Fundamentals and Frontier Technologies T. Kabutomori;H. Tamura
  2. J. Materials Science v.21 no.7 M.P. Sridhar Kumar;B. Viswanathan;C.S. Swany;V. Srinivasan
  3. The Electrochemical Society Proceedings v.PV.94-27 Z.P. Li;S. Suda
  4. J. Less-Common Metals v.120 no.1 H. Ishikawa;K. Oguro;A. Kato;H. Suzuki;E. Ishii
  5. J. Electrochem. Soc. v.134 no.3 T. Sakai;H. Ishikawa;K. Oguro;C. Iwakura;H. Yoneyama
  6. J. Alloys and Compounds v.190 no.1 F.-J. Liu;S. Suda
  7. J. Alloys and Compounds v.227 no.1 X.-L. Wang;S. Suda
  8. J. Alloys and Compounds v.253-254 M. Sakashita;Z. P. Li;S. Suda
  9. J. Korean, Inst. Surface Engineering v.30 no.4 H. Y. Park;B. H. Lee;W. I. Cho;B. W. Cho;S. R. Lee;J. B. Ju;K. S. Yun
  10. J. Korean Electrochem. Soc. v.1 no.1 I. Chang;B. H. Lee;W. I. Cho;H. Jang;B. W. Cho;K. S. Yun
  11. J. Met. Finish. Soc. Jpn. v.48 no.12 M. Kanda
  12. J. Korean Electrochem. Soc. v.2 no.2 C.R. Lee;S.G. Kang
  13. J. Alloys and Compounds v.231 no.1/2 F.-J. Liu;S. Suda
  14. J. Alloys and Compounds v.267 L. Yongning;Z. Xianji
  15. J. Materials Science v.24 no.12 M.P.S. Kumar;B. Viswanathan;C.S. Swamy
  16. JANAF Themochemical Tables(3rd ed.) NSRDS
  17. Thermochemical Data of Pure Substances I. Barin
  18. Smithells Metals Reference Bood(7th edn.) C.J. Smithells;E.A. Brandes;G.B. Brook
  19. CRC Handbook of Chemistry and Physics(79th edn.) D.R. Lide and Jr. Lide
  20. J. Alloys and Compounds v.231 no.1/2 Z.P. Li;S. Suda
  21. Materials Research Bullein v.17 no.7 G.D. Sandrock;J.J. Murray;M.L. Post;J.B. Taylor