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Issue 45, 2015
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A study of suppressed formation of low-conductivity phases in doped Li7La3Zr2O12 garnets by in situ neutron diffraction

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Abstract

Doped Li7La3Zr2O12 garnets, oxide-based solids with good Li+ conductivity and compatibility, show great potential as leading electrolyte material candidates for all-solid-state lithium ion batteries. However, the conductive bulk usually suffers from the presence of secondary phases and the transition towards a low-conductivity tetragonal phase during synthesis. Dopants are designed to stabilize the high-conductive cubic phase and suppress the formation of the low-conductivity phases. In situ neutron diffraction enables a direct observation of the doping effects by monitoring the phase evolutions during garnet synthesis. It reveals the reaction mechanism involving the temporary presence of intermediate phases. The off-stoichiometry due to the liquid Li2CO3 evaporation leads to the residual of the low-conductivity intermediate phase in the as-synthesized bulk. Appropriate doping of an active element may alter the component of the intermediate phases and promote the completion of the reaction. While the dopants aid to stabilize most of the cubic phase, a small amount of tetragonal phase tends to form under a diffusion process. The in situ observations provide the guideline of process optimization to suppress the formation of unwanted low-conductivity phases.

Graphical abstract: A study of suppressed formation of low-conductivity phases in doped Li7La3Zr2O12 garnets by in situ neutron diffraction

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Supplementary files

Article information


Submitted
01 Jul 2015
Accepted
27 Sep 2015
First published
28 Sep 2015

J. Mater. Chem. A, 2015,3, 22868-22876
Article type
Paper

A study of suppressed formation of low-conductivity phases in doped Li7La3Zr2O12 garnets by in situ neutron diffraction

Y. Chen, E. Rangasamy, C. R. dela Cruz, C. Liang and K. An, J. Mater. Chem. A, 2015, 3, 22868
DOI: 10.1039/C5TA04902D

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