Abstract
The cycling performance of Si-nanoparticle/Li cells with different electrolytes has been investigated. Cells containing standard binary LiPF6/ethylene carbonate/ethyl methyl carbonate electrolytes have poor capacity retention (46 %) after 50 cycles. Cells cycled with fluoroethylene carbonate (FEC)-based electrolyte have much better capacity retention (74 %). The effect of incorporation of flame-retardant co-solvents triphenyl phosphate and dimethyl methylphosphonate was investigated with both the standard and FEC electrolytes. The incorporation of the FR co-solvents did not significantly alter the performance of either electrolyte. Ex situ analysis via scanning electron microscopy, attenuated total reflectance infrared spectroscopy, and X-ray photoelectron spectroscopy was conducted to gain a better understanding of the role of electrolyte in solid electrolyte interphase structure and stability.
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The authors gratefully acknowledge funding from Department of Energy Office of Basic Energy Sciences EPSCoR Implementation award (DE-SC0007074).
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Dunn, R.P., Nguyen, C.C. & Lucht, B.L. Flame-retardant co-solvent incorporation into lithium-ion coin cells with Si-nanoparticle anodes. J Appl Electrochem 45, 873–880 (2015). https://doi.org/10.1007/s10800-015-0856-6
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DOI: https://doi.org/10.1007/s10800-015-0856-6