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Journal of Power Sources 244 (2013) 122 e128 Contents lists available at SciVerse ScienceDirect Journal of Power Sources journal homepage: www.elsevi /locate/jpowsour Diphenyloctyl phosphate as a solid electrolyte interphase forming additive for Li-ion batteries In-Jun Park, Tae-Heum Nam, Jung-Gu Kim* School of Advanced Materials Science and Engineering, Sungkyunkwan University, 300 Chunchun-Dong, Jangan-Gu, Suwon 440-746, Republic of Korea h i g h l i g h t s Addition of DPOF in electrolyte improves the rate performance of the lithium ion battery. The cell impedance with DPOF is lower than that without DPOF. DPOF forms the SEI film composed of Li3PO4 on the anode electrode. Li3PO4 increases the mobility of lithium ion at the interface between anode electrode and electrolyte. a r t i c l e i n f o a b s t r a c t Article history: The cycleability and rate performance of Li-ion batteries are mainly influenced by the characteristics of Received 12 November 2012 the solid electrolyte interphase (SEI) film. The use of diphenyloctyl phosphate (DPOF) was investigated as Received in revised form an SEI-forming additive in electrolyte. Cyclic voltammetry (CV), three-electrode electrochemical 24 January 2013 impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS) and scanning electron micro- Accepted 7 March 2013 Available online 16 March 2013 scopy (SEM) were used for the analyzes. The cell with DPOF had better cell performance than that