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Electrochemistry of LiMn2O4 epitaxial films deposited on various single crystal substrates |
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| Authors: | Noriyuki Sonoyama Kosuke Iwase Hironori Takatsuka Tadaaki Matsumura Nobuyuki Imanishi Yasuo Takeda Ryoji Kanno |
| Affiliation: | 1. Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cyo, Showa-ku, Nagoya 466-8555, Japan;2. Department of Chemistry, Mie University, 1577 Kurimamachiyacho, Tsu, Mie 514-8507, Japan;3. Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatuta-cyo, Midori-ku, Yokohama 226-8502, Japan |
| Abstract: | LiMn2O4 epitaxial thin films were synthesized on SrTiO3:Nb(1 1 1) and Al2O3(0 0 1) single crystal substrates by pulsed laser deposition (PLD) method and the electrochemical properties were discussed comparing with that of amorphous LiMn2O4 film on polycrystalline Au substrate. LiMn2O4 epitaxial film showed only a single plateau in charge–discharge curves and a single redox peak at the corresponding voltage of cyclic voltammograms. This phenomenon seems to originate from the effect of the epitaxy: the film is directly connected with the substrate by the chemical bond and this connection would suppress the phase transition of LixMn2O4 film during lithium (de-)intercalation. The discharge voltage of LiMn2O4 epitaxial film on SrTiO3 was lower than that of LiMn2O4 film on Al2O3. This lowered discharge voltage may be caused by the electronic interaction between LiMn2O4 film and SrTiO3:Nb n-type semiconductor substrate. |
| Keywords: | Epitaxial film LiMn2O4 Substrate effect Absorption spectrum during lithium intercalation |
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