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Open AccessArticle

Continuous Composition Spread and Electrochemical Studies of Low Cobalt Content Li(Ni,Mn,Co)O2 Cathode Materials

1
Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Korea
2
Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea
3
Nano Materials and Engineering, University of Science and Technology (UST), Dae-Jeon 34113, Korea
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(6), 366; https://doi.org/10.3390/coatings9060366
Received: 27 February 2019 / Revised: 29 May 2019 / Accepted: 30 May 2019 / Published: 4 June 2019
Many scientific efforts have been undertaken toward reducing the Co content in LiMn1/3Ni1/3Co1/3O2 cathode materials for thin-film batteries. In this study, we present cathodes with a wide range of Li(Ni, Mn, Co)O2 compositions to determine the material with the best electrochemical performance by changing the ratio of Ni to Mn at a fixed 0.1 at.% of Co by the continuous composition spread sputtering method. The cathode composition measurements by Rutherford backscattering spectroscopy show that the best electrochemical performance is obtained for a composition of Ni:Mn:Co = 19:71:10. The reasons for this improved electrochemical performance are further investigated by X-ray diffraction, electrochemical impedance spectroscopy, Fourier-transform infrared spectroscopy, and X-ray absorption near edge spectroscopy. View Full-Text
Keywords: continuous composition spread; Li(Ni; Mn; Co)O2 cathode; low cobalt content; thin film; X-ray near edge spectroscopy continuous composition spread; Li(Ni; Mn; Co)O2 cathode; low cobalt content; thin film; X-ray near edge spectroscopy
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Jung, J.; Yim, H.; Parmar, N.S.; Lee, J.-S.; Choi, J.-W. Continuous Composition Spread and Electrochemical Studies of Low Cobalt Content Li(Ni,Mn,Co)O2 Cathode Materials. Coatings 2019, 9, 366.

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