Ion trapping and its effect on the conductivity of LISICON and other solid electrolytes

  • Bruce P
  • West A
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Abstract

Conductivity data for the lithium ion conducting solid electrolyte, LISICON, Li2+2xZn1-xGeO4over a particularly wide composition range, 0.15 < x < 0.85, and over the temperature range ∼25 to 150°C show that both the activation energy and preexponential factor pass through maxima around x ∼ 0.4 to 0.5, at which the preexponential factor exhibits anomalously high values, ∼1013ohm-1cm-1K. An explanation is offered which involves the trapping of mobile Li+ions by the immobile sublattice at lower temperatures. This model also accounts for ageing effects observed at lower temperatures in which the conductivity decreases slowly with time. In the isostructural Li+electrolytes, Li3+xSixY1-xO4(Y = P, As, V), the compositional dependence of both the preexponential factor and activation energy is less marked and no evidence for ion trapping effects is observed. © 1984.

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