Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 158, Issue 12, Pages A1298-A1302Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.030112jes
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Funding
- NASA Glenn Research Center
- Welch Foundation [F-1254]
- U.S. Department of Energy [DE-AC36-08GO28308]
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The lithium-excess layered oxide Li[Li0.2Mn0.54Ni0.13Co0.13]O-2 has been surface modified with Al2O3 films grown with atomic layer deposition (ALD) and examined as cathodes for lithium-ion batteries. Al2O3 was grown on powders prior to electrode fabrication, directly on the electrode, and directly on the electrode followed by a heat-treatment at 300 degrees C in air. Compared to the bare electrode, an Al2O3 film on an as-formed electrode improved the cycle performance significantly. Furthermore, the heat treatment of the ALD-coated electrodes result in significant increase in capacity, due to the transformation of the as-deposited Al2O3 to a better Li+-conductive material. X-ray photoelectron spectroscopy (XPS) results indicate that the heat-treatment leads to an inter-diffusion of atoms between the Al2O3 coating and the Li[Li0.20Mn0.54Ni0.13Co0.13]O-2 core. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.030112jes] All rights reserved.
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