Improvement in stability of LiMn2O4 thin-film electrodes by oxygen-plasma irradiation to precursor gel |
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Authors: | Yoshiaki Matsuo Yosohiro Sugie Kouta Sakamoto Tomokazu Fukutsuka |
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Institution: | 1. Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo, 671-2280, Japan 2. Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
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Abstract: | LiMn2O4 thin-film electrodes were prepared by the sol?Cgel method combined with oxygen-plasma irradiation. Oxygen plasma with a power of 10 or 90?W was irradiated to the precursor thin film prepared from lithium acetate, manganese acetate tetrahydrate and polyvinylpyrrolidone on a Pt plate, and then it was fired at 723 or 973?K. X-ray diffraction and Raman measurements indicated that oxygen-plasma irradiation was effective to increase the crystallinity of the resulting LiMn2O4. Atomic force microscope observation showed that the particle size of LiMn2O4 in the resulting thin-film electrode was decreased and homogeneous distribution of LiMn2O4 particles was achieved. Oxidation of the electrolyte at higher potentials was suppressed and capacity retention at 328?K was dramatically improved for the LiMn2O4 thin-film electrode obtained at 973?K. The improved electrochemical stability is ascribed to the elimination of organic materials from precursor by oxygen-plasma irradiation. |
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