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Issue 30, 2012
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Optimizing Li+ conductivity in a garnet framework

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Abstract

The garnet-related oxides with the general formula Li7−xLa3Zr2−xTaxO12 (0 ≤ x ≤ 1) were prepared by conventional solid-state reaction. X-ray diffraction (XRD), neutron diffraction and AC impedance were used to determine phase formation and the lithium-ion conductivity. The lattice parameter of Li7−xLa3Zr2−xTaxO12 decreased linearly with increasing x. Optimum Li-ion conductivity in the Li-ion garnets Li7−xLa3Zr2−xTaxO12 is found in the range 0.4 ≤ x ≤ 0.6 for samples fired at 1140 °C in an alumina crucible. A room-temperature σLi ≈ 1.0 × 10−3 S cm−1 for x = 0.6 with an activation energy of 0.35 eV in the temperature range of 298–430 K makes this Li-ion solid electrolyte attractive for a new family of Li-ion rechargeable batteries.

Graphical abstract: Optimizing Li+ conductivity in a garnet framework

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Article information


Submitted
07 Mar 2012
Accepted
03 Jun 2012
First published
07 Jun 2012

J. Mater. Chem., 2012,22, 15357-15361
Article type
Paper

Optimizing Li+ conductivity in a garnet framework

Y. Li, J. T. Han, C. A. Wang, H. Xie and J. B. Goodenough, J. Mater. Chem., 2012, 22, 15357
DOI: 10.1039/C2JM31413D

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