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.
Bibliographical noteFunding Information:
ReferencesFunding: This research was supported by the KIST Future Resource Program (2E29400), and the Brain Korea 21
This research was supported by the KIST Future Resource Program (2E29400), and the Brain Korea 21 Plus Project
© 2019 by the authors.
- Continuous composition spread
- Li(Ni; Mn; Co)O cathode
- Low cobalt content
- Thin film
- X-ray near edge spectroscopy
ASJC Scopus subject areas
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry