Atomic layer deposition (ALD) was used to control the stoichiometry of thin lithium aluminosilicate films, thereby enabling crystallization into the ion-conducting β-eucryptite LiAlSiO4 phase. Here, the rapid thermal annealed ALD film developed a well-defined epitaxial relationship to the silicon substrate: β-LiAlSiO4 ($$1\bar{21}0$$)||Si (100) and β-LiAlSiO4 ($$10\bar{10}$$)||Si (001). The extrapolated room temperature ionic conductivity was found to be 1.2 × 10–7 S/cm in the [$$1\bar{21}0$$] direction. Because of the unique 1-D channel along the c axis of β-LiAlSiO4, the epitaxial thin film has the potential to facilitate ionic transport if oriented with the c axis normal to the electrode surface, making it a promising electrolyte material for three-dimensional lithium-ion microbatteries.
@article{osti_1767976,
author = {Sheil, Ryan and Perng, Ya-Chuan and Mars, Julian and Cho, Jea and Dunn, Bruce and Toney, Michael F. and Chang, Jane P.},
title = {Synthesis and Crystallization of Atomic Layer Deposition β-Eucryptite LiAlSiO<sub>4</sub> Thin-Film Solid Electrolytes},
annote = {Atomic layer deposition (ALD) was used to control the stoichiometry of thin lithium aluminosilicate films, thereby enabling crystallization into the ion-conducting β-eucryptite LiAlSiO4 phase. Here, the rapid thermal annealed ALD film developed a well-defined epitaxial relationship to the silicon substrate: β-LiAlSiO4 ($1\bar{21}0$)||Si (100) and β-LiAlSiO4 ($10\bar{10}$)||Si (001). The extrapolated room temperature ionic conductivity was found to be 1.2 × 10–7 S/cm in the [$1\bar{21}0$] direction. Because of the unique 1-D channel along the c axis of β-LiAlSiO4, the epitaxial thin film has the potential to facilitate ionic transport if oriented with the c axis normal to the electrode surface, making it a promising electrolyte material for three-dimensional lithium-ion microbatteries.},
doi = {10.1021/acsami.0c11614},
url = {https://www.osti.gov/biblio/1767976},
journal = {ACS Applied Materials and Interfaces},
issn = {ISSN 1944-8244},
number = {51},
volume = {12},
place = {United States},
publisher = {American Chemical Society (ACS)},
year = {2020},
month = {12}}