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DOE OSTI · 1767976

Synthesis and Crystallization of Atomic Layer Deposition β-Eucryptite LiAlSiO 4 Thin-Film Solid Electrolytes

Sheil, Ryan·Perng, Ya-Chuan·Mars, Julian·Cho, Jea·Dunn, Bruce·Toney, Michael F.·Chang, Jane P.
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Abstract

Atomic layer deposition (ALD) was used to control the stoichiometry of thin lithium aluminosilicate films, thereby enabling crystallization into the ion-conducting β-eucryptite LiAlSiO 4 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-LiAlSiO 4 ($10\bar{10}$)||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-LiAlSiO 4 , 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.

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25 ENERGY STORAGE3D batteriesatomic layer depositioncrystalline solid electrolytedepositionepitaxial thin filmsionic conductivitylithium-ion batteriessiliconthin filmsthin-film processing

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Sheil, Ryan, Perng, Ya-Chuan, Mars, Julian, Cho, Jea, Dunn, Bruce, Toney, Michael F., Chang, Jane P.. 2020-12-14. Synthesis and Crystallization of Atomic Layer Deposition β-Eucryptite LiAlSiO 4 Thin-Film Solid Electrolytes. https://doi.org/10.1021/acsami.0c11614

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