Journal
CARBON
Volume 52, Issue -, Pages 128-136Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2012.09.013
Keywords
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Funding
- WCU (World Class University) program through the Korea Science and Engineering Foundation
- Ministry of Education, Science and Technology [R31-10022]
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We report for the first time the use of graphene oxide (GO) as a protective coating to inhibit the corrosion of an aluminum current collector used in lithium ion batteries. We employed a simple, but effective spin-coating method for coating GO onto Al, which functioned as an effective Al corrosion inhibitor in LiPF6 as an electrolyte. Cyclic voltammetry, impedance, electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron microscopy studies all revealed that the GO strongly adheres to Al and effectively suppresses Al oxidation behaving as a charge transport barrier to pitting-causing PF6-. The GO-coating was not damaged, and, thus, the underlying native oxide layer remained intact under corrosive conditions. Charge discharge tests performed with LiMn2O4 on a GO-coated Al current collector displayed a greater capacity with improved cyclability over LiMn2O4 on bare Al. Self-discharge testing also showed a less open circuit voltage decline for GO-coated Al, indicating Al corrosion protection by GO. (C) 2012 Elsevier Ltd. All rights reserved.
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