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000828986 1001_ $$0P:(DE-HGF)0$$aWagner, Ralf$$b0$$eCorresponding author
000828986 245__ $$aImpact of Selected LiPF $_{6}$ Hydrolysis Products on the High Voltage Stability of Lithium-Ion Battery Cells
000828986 260__ $$aWashington, DC$$bSoc.$$c2016
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000828986 520__ $$aDiverse LiPF6 hydrolysis products evolve during lithium-ion battery cell operation at elevated operation temperatures and high operation voltages. However, their impact on the formation and stability of the electrode/electrolyte interfaces is not yet investigated and understood. In this work, literature-known hydrolysis products of LiPF6 dimethyl fluorophosphate (DMFP) and diethyl fluorophosphate (DEFP) were synthesized and characterized. The use of DMFP and DEFP as electrolyte additive in 1 M LiPF6 in EC:EMC (1:1, by wt) was investigated in LiNi1/3Mn1/3Co1/3O2/Li half cells. When charged to a cutoff potential of 4.6 V vs Li/Li+, the additive containing cells showed improved cycling stability, increased Coulombic efficiencies, and prolonged shelf life. Furthermore, low amounts (1 wt % in this study) of the aforementioned additives did not show any negative effect on the cycling stability of graphite/Li half cells. DMFP and DEFP are susceptible to oxidation and contribute to the formation of an effective cathode/electrolyte interphase as confirmed by means of electrochemical stability window determination, and X-ray photoelectron spectroscopy characterization of pristine and cycled electrodes, and they are supported by computational calculations.
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000828986 7001_ $$0P:(DE-HGF)0$$aKorth, Martin$$b1
000828986 7001_ $$0P:(DE-HGF)0$$aStreipert, Benjamin$$b2
000828986 7001_ $$0P:(DE-Juel1)171865$$aKasnatscheew, Johannes$$b3$$ufzj
000828986 7001_ $$0P:(DE-HGF)0$$aGallus, Dennis R.$$b4
000828986 7001_ $$0P:(DE-HGF)0$$aBrox, Sebastian$$b5
000828986 7001_ $$0P:(DE-HGF)0$$aAmereller, Marius$$b6
000828986 7001_ $$0P:(DE-Juel1)171204$$aCekic-Laskovic, Isidora$$b7$$ufzj
000828986 7001_ $$0P:(DE-Juel1)166130$$aWinter, Martin$$b8$$eCorresponding author$$ufzj
000828986 773__ $$0PERI:(DE-600)2467494-1$$a10.1021/acsami.6b09164$$gVol. 8, no. 45, p. 30871 - 30878$$n45$$p30871 - 30878$$tACS applied materials & interfaces$$v8$$x1944-8252$$y2016
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