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Solid Potassium-Conducting Electrolytes in the System K2 − 2x Al2 − x P x O4

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Abstract

New high-conductance potassium-cation solid electrolytes based on potassium aluminate are synthesized by means of partial substitution of five-charged phosphorus cations for three-charged aluminum cations and investigated. The maximum conductivity in the system K2 − 2x Al2 − x P x O4 is found to equal 5 × 10−3 S cm−1 at 200°C and ∼1 S cm−1 at 700°C, which is one of the best values for potassium solid electrolytes. The principal factors responsible for the high conductance are the stabilization of a high-temperature form of potassium aluminate and the formation of additional vacancies in the potassium sublattice, which occurs during the substitution process Al3+ → P5+ + 2V ′K .

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Authors and Affiliations

  1. Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 22, Yekaterinburg, 620219, Russia

    E. I. Burmakin & G. Sh. Shekhtman

Authors
  1. E. I. Burmakin
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  2. G. Sh. Shekhtman
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Correspondence to E. I. Burmakin.

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__________

Translated from Elektrokhimiya, Vol. 41, No. 12, 2005, pp. 1501–1504.

Original Russian Text Copyright © 2005 by Burmakin, Shekhtman.

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Burmakin, E.I., Shekhtman, G.S. Solid Potassium-Conducting Electrolytes in the System K2 − 2x Al2 − x P x O4 . Russ J Electrochem 41, 1341–1344 (2005). https://doi.org/10.1007/s11175-005-0224-7

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  • DOI: https://doi.org/10.1007/s11175-005-0224-7

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