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Issue 40, 2019
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Probing into the origin of an electronic conductivity surge in a garnet solid-state electrolyte

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Abstract

Herein, through studying the electronic conductivity of a garnet electrolyte Li7La2.75Ca0.25Zr1.75Nb0.25O12 (LLCZN) at different temperatures, a model to describe the electron transfer process within garnet electrolytes is proposed for the first time. In this model, electronic conductivity is mainly determined by the barrier height and bias between the grain boundaries of LLCZN. As the external voltage polarization increases with ion current densities and finally exceeds a threshold value, electron conductivity concentration at grain boundaries increases sharply to the critical point for the combination between Li-ions and electrons. Lithium metal will consequently deposit on the grain boundaries and short circuit LLCZN. According to the results, lowering the voltage polarization across the solid electrolyte and increasing the electron transfer energy barrier at grain boundaries are two effective approaches to realize practical applications of garnet electrolytes in solid-state lithium metal batteries.

Graphical abstract: Probing into the origin of an electronic conductivity surge in a garnet solid-state electrolyte

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Publication details

The article was received on 17 Sep 2019, accepted on 25 Sep 2019 and first published on 30 Sep 2019


Article type: Communication
DOI: 10.1039/C9TA10269H
J. Mater. Chem. A, 2019,7, 22898-22902

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    Probing into the origin of an electronic conductivity surge in a garnet solid-state electrolyte

    Y. Song, L. Yang, L. Tao, Q. Zhao, Z. Wang, Y. Cui, H. Liu, Y. Lin and F. Pan, J. Mater. Chem. A, 2019, 7, 22898
    DOI: 10.1039/C9TA10269H

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