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Defect Chemistry and Electrical Properties of Garnet-Type Li7La3Zr2O12

Abstract

Garnet-type cubic Li7La3Zr2O12 exhibits one of the highest lithium-ion conductivity values amongst oxides (up to ~2 mS/cm at room temperature). This compound has also emerged as a promising candidate for solid electrolyte in all-solid-state lithium batteries, due to its high ionic conductivity, good chemical stability against lithium metal, and wide electrochemical stability window. Defect chemistry of this class of materials, yet less studied, is critical to understanding of the nature of ionic conductivity and predicting properties of grain boundaries and heterogeneous solid interfaces. In this study, electrical properties of nominally undoped cubic Li7La3Zr2O12 are characterized as a function of temperature and pO2 using a suite of AC impedance and DC polarization techniques. The formation of ionic defects and defect pairs as well as their impact on transport properties are discussed, and a Brouwer-type diagram is constructed.

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Publication details

The article was received on 04 Oct 2017, accepted on 04 Dec 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP06768B
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Defect Chemistry and Electrical Properties of Garnet-Type Li7La3Zr2O12

    X. Zhan, S. Lai, M. Gobet, S. G. Greenbaum and M. Shirpour, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP06768B

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