Surface modification of LiNi0.5Mn1.5O4 cathodes with ZnAl2O4 by a sol-gel method for lithium ion batteries
- Authors
- Lee, Yongho; Mun, Junyoung; Kim, Dong-Won; Lee, Joong Kee; Choi, Wonchang
- Issue Date
- Jan-2014
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Lithium ion battery; Lithium nickel manganese oxide; Surface modification; Zinc aluminate coating
- Citation
- ELECTROCHIMICA ACTA, v.115, pp.326 - 331
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 115
- Start Page
- 326
- End Page
- 331
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/160895
- DOI
- 10.1016/j.electacta.2013.10.127
- ISSN
- 0013-4686
- Abstract
- The 5 V spinel LiNi0.5Mn1.5O4 cathodes have been surface-modified with ZnAl2O4 by a sal-gel method and characterized by X-ray diffraction, high-resolution transmission electron microscopy, and electrochemical measurements. Although the pristine electrode experienced the prominent degradation after the storage test at 60 degrees C in the intervals of cycling test at room temperature, the ZnAl2O4-coated LiNi0.5Mn1.5O4 cathode exhibited the significant capacity retention even after storing at elevated temperatures. The X-ray photoelectron spectroscopy data reveals that the improved electrochemical performances of surface-coated cathode are mostly due to the suppressed side reaction between the cathode and the electrolyte especially at the high-temperature environment. Differential scanning calorimetry showed that the decreased heat evolution could be found with the surface-modified cathode. Our experimental findings suggest a direction to the further development of cathode materials which are endurable to the highly oxidized state and high-temperature environment.
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