Epitaxial Growth of LiMn2O4 Thin Films by Chemical Solution Deposition for Multilayer Lithium-Ion Batteries

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• 作者：Yumi H. Ikuhara ; Xiang Gao ; Rong Huang ; Craig A. J. Fisher ; Akihide Kuwabara ; Hiroki Moriwake ; Keiichi Kohama
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：August 28, 2014
• 年：2014
• 卷：118
• 期：34
• 页码：19540-19547
• 全文大小：465K
• ISSN：1932-7455

文摘

Cathodic LiMn₂O₄ films on various single-crystal substrates for use in thin-film Li-ion batteries prepared using a chemical solution deposition method are reported. Transmission electron microscopy is utilized to characterize the microstructures of the films. The results show that the film/substrate lattice misfit can affect significantly the quality of epitaxially grown grains of LiMn₂O₄. Using state-of-the-art high-angle annular dark-field imaging, the degree of coherency and lattice distortion at interfaces between LiMn₂O₄ and Au-coated and uncoated Al₂O₃ (0001) single-crystal substrates are examined at the atomic scale. When the lattice misfit is sufficiently small, fully coherent LiMn₂O₄/Au heterointerfaces form, although lattice strain to a distance of up to around 10 nm from the interface changes the symmetry of spinel LiMn₂O₄ from cubic to tetragonal. Such an interface in the LiMn₂O₄/Au/Al₂O₃ system facilitates high-quality epitaxial film growth to thicknesses of a couple hundred nanometers.