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Surface modification of LiNi0.5Mn1.5O4 cathodes with ZnAl2O4 by a sol-gel method for lithium ion batteries

Title
Surface modification of LiNi0.5Mn1.5O4 cathodes with ZnAl2O4 by a sol-gel method for lithium ion batteries
Author
김동원
Keywords
Lithium ion battery; Lithium nickel manganese oxide; Surface modification; Zinc aluminate coating
Issue Date
2014-01
Publisher
Elsevier B.V
Citation
Electrochimica Acta, 1 January 2014, 115, 326-331
Abstract
The 5V spinel LiNi0.5Mn1.5O4 cathodes have been surface-modified with ZnAl2O4 by a sol?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°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.
URI
https://www.sciencedirect.com/science/article/pii/S0013468613020975http://hdl.handle.net/20.500.11754/47726
ISSN
0013-4686
DOI
10.1016/j.electacta.2013.10.127
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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