Journal
JOURNAL OF POWER SOURCES
Volume 192, Issue 2, Pages 714-718Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2009.02.075
Keywords
Graphite; Cyclic sulfate; Irreversible capacity; SEI
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Initial irreversible capacity loss in graphite electrodes was suppressed by 1,3,2-dioxathiolane-2,2-dioxide and its derivatives (cyclic sulfates) in propylene carbonate (PC) containing electrolyte. Cyclic voltammetry (CV) showed that cyclic sulfates were decomposed at higher potentials than that for electrolyte solvents. In galvanostatic charge and discharge measurement, first cycle efficiency was increased from 58.2% to 90.5% by the addition of 1,3,2-dioxathiolane-2,2-dioxide. Passivation films formed by cyclic sulfates were observed by X-ray photoelectron spectroscopy (XPS), FT-IR, and pyrolysis/GC/MS (pyro/GC/MS). These results indicate that the surface was covered by a PEO like polymer with the inner layer comprised of Li(2)S like compounds. (C) 2009 Elsevier B.V. All rights reserved.
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