1. Effect of surface Li3PO4 coating on LiNi0.5Mn1.5O4 epitaxial thin film electrodes synthesized by pulsed laser deposition.
- Author
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Hiroaki Konishi, Kota Suzuki, Sou Taminato, Kyungsu Kim, Yueming Zheng, Sangryun Kim, Jaemin Lim, Masaaki Hirayama, Jin-Young Son, Yitao Cui, and Ryoji Kanno
- Subjects
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METALLIC surfaces , *EPITAXY , *THIN films , *PULSED laser deposition , *THIN film deposition , *THICKNESS measurement , *METAL coating - Abstract
The effect of Li3PO4 coating was investigated for LiNi0.5Mn1.5O4 epitaxial thin film electrodes synthesized on SrTiO3 substrates by pulsed laser deposition (PLD). Amorphous Li3PO4 with a thickness of 1-4 nm was coated at room temperature onto 30 nm thick epitaxial LiNi0.5Mn1.5O4 thin films with (111), (110) and (100) lattice orientations. Electrodes with the surface coating exhibit high charge-discharge capacities and small capacity degradation during cycling experiments in the high voltage region. X-ray absorption near edge structure (XANES) and hard X-ray photoelectron spectroscopy (HAXPES) analyses indicate a higher manganese valence for the electrode surface of the Li3PO4 stacked LiNi0.5Mn1.5O4 film than that for the surface of a pristine LiNi0.5Mn1.5O4 film. Thus, surface coating affects the manganese valence near the electrode surface and improves the cycling characteristics. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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