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Journal of Applied Electrochemistry

, Volume 29, Issue 11, pp 1285–1289 | Cite as

Fabrication and evaluation of 1 Ah silver/metal hydride cells

  • S. Rodrigues
  • N. Munichandraiah
  • A.K. Shukla
Article

Abstract

Silver/metal hydride (Ag/MH) cells of about 1 Ah capacity have been fabricated and their discharge characteristics at different rates of discharge, faradaic efficiency, cycle life and a.c. impedance have been evaluated. These cells comprise metal–hydride electrodes prepared by employing ∼60 μm powder of an AB2-Laves phase alloy of nominal composition Zr0.5Ti0.5V0.6Cr0.2Ni1.2 with PTFE binder on a nickel-mesh substrate as the negative plates and commercial-grade silver electrodes as the positive plates. The cells are positive limited and exhibit two distinct voltage plateaus characteristic of two-step reduction of AgO to Ag during their low rates of discharge between C/20 and C/10. This feature is, however, absent when the cells are discharged at C/5 rate. On charging the cells to 100% of their capacity, the faradaic efficiency is found to be 100%. The impedance of the Ag/MH cell is essentially due to the impedance of the silver electrodes, since MH electrodes offer negligible impedance. The cells may be subjected to a large number of charge–discharge cycles with little deterioration.

AB2 alloy cell discharge capacity hydrogen storage alloy impedance silver/metal–hydride cell 

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References

  1. 1.
    M.A. Fecenko, S. Venkatesan and S.R. Ovshinsky, D.A. Corrigan, and S. Srinivasan (Eds.), Proc. Electrochem. Soc. (The Electrochemical Society, Pennington, NJ), Vol. 92- 5 (1992) pp. 141–167.Google Scholar
  2. 2.
    A. Anani, A. Visintin, K. Petrov, S. Srinivasan, J.J. Reilly, J.R. Johnson, R.B. Schwarz and P.B. Desch, J. Power Sources 47 (1994) 261.Google Scholar
  3. 3.
    D. Coates, C. Fox, and L. Miller, Proceedings of the 27th Intersociety Energy Conversion Engineering Conference, San Diego, CA, Vol. 2 (1992), p. 2.165.Google Scholar
  4. 4.
    T. Harvey and B. Hawkins, Proceedings of the 28th Intersociety Energy Conversion Engineering Conference, Atlanta, GA, Vol. 1 (1993), p. 1.681.Google Scholar
  5. 5.
    C.A. Vincent and B. Scrosati, ‘Modern Batteries, An Introduction to Electrochemical Power Sources’, 2nd edn, (Arnold, London, 1997), p. 197.Google Scholar
  6. 6.
    D.E. Reisner, R.F. Plivelich and M.G. Klein, Proceedings of the 30th Intersociety Energy Conversion Engineering Conference, Orlando, FA, Vol. 3 (1995), p. 235.Google Scholar
  7. 7.
    V. Ganesh Kumar, K.M. Shaju, N. Munichandraiah and A.K. Shukla, J. Power Sources 76 (1998) 106.Google Scholar
  8. 8.
    S.U. Falk and A.J. Salkind, ‘Alkaline Storage Batteries’, The Electrochemical Society, (J. Wiley & Sons, New York, 1969), p.156.Google Scholar
  9. 9.
    T.P. Dirkse and G.J. Werkema, J. Electrochem. Soc. 106 (1959) 88.Google Scholar

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • S. Rodrigues
    • 1
  • N. Munichandraiah
    • 2
  • A.K. Shukla
    • 1
  1. 1.Solid State and Structural Chemistry UnitIndian Institute of ScienceBangaloreIndia
  2. 2.Department of Inorganic and Physical ChemistryIndian Institute of ScienceBangaloreIndia

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