Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 5, Pages 2501-2506Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2007.10.019
Keywords
lithium batteries; magnesium co-deposition; X-ray photoclectron spectroscopy (XPS); surface chemistry; coulombic efficiency
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The effect of Mg(ClO4)(2) and HF acid in 1 M LiPF6(/EC + DEC + DME electrolyte oil the cycle behaviors and the surface characteristics of the lithium electrode were investigated. The morphology of the electrode is greatly improved using Li-Mg co-deposition and HIP acid, and results in the enhancement of the cyclability observed by electrochemical measurement. The scanning electron microscopy images of the electrode surface show densely deposited lithium-magnesium alloy particles with a hemispherical shape on the entire surface of the electrode. The improved coulombic efficiency was attributed to the synergistic effect due to the formation of Li-Mg alloy and LiF caused by Li-Mg co-deposition and HF to the electrolyte, respectively. (c) 2007 Elsevier Ltd. All rights reserved.
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