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Issue 6, 2003
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Probing the mobility of lithium in LISICON: Li+/H+ exchange studies in Li2ZnGeO4 and Li2+2xZn1−xGeO4

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Abstract

We investigated Li+/H+ exchange in the lithium ion conductors (LISICONS) [Li2+2xZn1−xGeO4; x = 0.5 (I) and x = 0.75 (II)] and their parent, γ-Li2ZnGeO4. Facile exchange of approximately 2x lithium ions per formula unit occurs with both the LISICONS in dilute acetic acid, while the parent material does not exhibit an obvious Li+/H+ exchange under the same conditions. The results can be understood in terms of lithium ion distribution in the crystal structures: the parent Li2ZnGeO4, where all the lithium ions form part of the tetrahedral framework structure, does not exhibit a ready Li+/H+ exchange; LISICONS, where lithium ions are distributed between framework (tetrahedral) and nonframework sites, undergo a facile Li+/H+ exchange of the nonframework site lithium ions. Accordingly, Li+/H+ exchange in dilute aqueous acetic acid provides a convenient probe to distinguish between the mobile and the immobile lithium ions in lithium ion conductors.

Graphical abstract: Probing the mobility of lithium in LISICON: Li+/H+ exchange studies in Li2ZnGeO4 and Li2+2xZn1−xGeO4

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Publication details

The article was received on 13 Mar 2003, accepted on 10 Apr 2003 and first published on 29 Apr 2003


Article type: Paper
DOI: 10.1039/B302914J
J. Mater. Chem., 2003,13, 1400-1405

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    Probing the mobility of lithium in LISICON: Li+/H+ exchange studies in Li2ZnGeO4 and Li2+2xZn1−xGeO4

    L. Sebastian, R. S. Jayashree and J. Gopalakrishnan, J. Mater. Chem., 2003, 13, 1400
    DOI: 10.1039/B302914J

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