Journal
JOURNAL OF POWER SOURCES
Volume 257, Issue -, Pages 163-169Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.12.144
Keywords
Li ion battery; Full cell; Silicon-graphene composite; Solid-electrolyte interphase; Fluoro-ethylene carbonate; Lithium nickel cobalt aluminum oxide cathode
Funding
- DOE SBIR Program (USA)
- National Research Foundation of Korea [2012R1A6A3A03040261]
- National Research Foundation of Korea [2012R1A6A3A03040261] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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When fluoroethylene carbonate (FEC) is added to the ethylene carbonate (EC)-diethyl carbonate (DEC) electrolyte, the capacity and cyclability of full-cells employing Si-graphene anode and lithium nickel cobalt aluminum oxide cathode (NCA) cathode are improved due to formation of a thin (30-50 nm) SEI layer with low ionic resistance (similar to 2 ohm cm(2)) on the surface of Si-graphene anode. These properties are confirmed with electrochemical impedance spectroscopy and a cross-sectional image analysis using Focused Ion Beam (FIB)-SEM. Approximately 5 wt.% FEC in EC:DEC (1:1 wt.%) shows the highest capacity and most stability. This high capacity and low capacity fade is attributed to a more stable SEI layer containing less CH2OCO2Li, Li2CO3 and LiF compounds, which consume cyclable Li. Additionally, a greater amount of polycarbonate (PC), which is known to form a more robust passivation layer, thus reducing further reduction of electrolyte, is confirmed with X-ray photoelectron spectroscopy (XPS). (C) 2014 Elsevier B.V. All rights reserved.
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