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2-Phenylimidazole as an additive to prevent the co-intercalation of propylene carbonate in organic electrolyte for lithium-ion batteries

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Title: 2-Phenylimidazole as an additive to prevent the co-intercalation of propylene carbonate in organic electrolyte for lithium-ion batteries
Authors: Wang, B.1, Qu, Q.T.1, Yang, L.C.1, Xia, Q.1, Wu, Y.P.1 wuyp@fudan.edu.cn, Zhou, D.L.2, Gu, X.J.2, van Ree, T.3 Teuns.VanRee@univen.ac.za
Source: Journal of Power Sources. Apr2009, Vol. 189 Issue 1, p757-760. 4p.
Subjects: Battery additives, Imidazoles, Propylene carbonate, Electrolytes, Lithium-ion batteries, Interfaces (Physical sciences), Anodes, Graphite
Abstract: Abstract: 2-Phenylimidazole (PID), which is structurally different from previously reported compounds, has been studied as a film-forming additive for graphite anode in PC-based electrolyte for lithium-ion batteries. A 1.0moll−1 LiPF6/PC: DMC (1:1, v/v) electrolyte containing 3wt.% 2-phenylimidazole was capable of suppressing the co-intercalation of PC and inhibiting the decomposition of electrolytes during the first lithium intercalation. The cyclic voltammogram shows that the reduction potential of PID is about 1.65V vs. Li/Li+, forming a favorable solid electrolyte interface (SEI) on the graphite electrode. The morphologies and the chemical composition of the graphite electrode surface were characterized by SEM and XPS. The results show that a stable SEI film was formed on the surface of graphite by the addition of PID, which accounts for the excellent cycleability of the graphite electrode in PC-based electrolyte. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: 2-Phenylimidazole (PID), which is structurally different from previously reported compounds, has been studied as a film-forming additive for graphite anode in PC-based electrolyte for lithium-ion batteries. A 1.0moll−1 LiPF6/PC: DMC (1:1, v/v) electrolyte containing 3wt.% 2-phenylimidazole was capable of suppressing the co-intercalation of PC and inhibiting the decomposition of electrolytes during the first lithium intercalation. The cyclic voltammogram shows that the reduction potential of PID is about 1.65V vs. Li/Li+, forming a favorable solid electrolyte interface (SEI) on the graphite electrode. The morphologies and the chemical composition of the graphite electrode surface were characterized by SEM and XPS. The results show that a stable SEI film was formed on the surface of graphite by the addition of PID, which accounts for the excellent cycleability of the graphite electrode in PC-based electrolyte. [Copyright &y& Elsevier]
ISSN:03787753
DOI:10.1016/j.jpowsour.2008.08.021