Allyl ethyl carbonate as an additive for lithium-ion battery electrolytes

• Published in: Journal of power sources 2004-05, Vol.132 (1), p.244-248
• Main Authors: Lee, Jyh-Tsung, Lin, Yueh-Wei, Jan, Yih-Song
• Format: Article
• Language: English
• Subjects: Additive; Allyl ethyl carbonate; Applied sciences; Cycleability; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Lithium-ion battery; Reversible capacity; Solid electrolyte interphase
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2004.01.045

The role of allyl ethyl carbonate (AEC) as an additive in electrolytes used in lithium-ion batteries is investigated. The 1.0 M LiPF 6 in propylene carbonate (PC): diethyl carbonate (DEC) (3:2 in volume) electrolyte containing AEC can suppress the co-intercalation of PC and inhibit the decomposition of electrolytes during the first lithium intercalation. A graphitic anode (MCMB-2528, mesocarbon microbeads) in a PC-based electrolyte exhibits a high reversible capacity of 320 mAh g −1. The reduction potential of AEC is 1.5 V versus Li|Li + as determined by cyclic voltammetry (CV). The morphology and structure of graphite electrodes after the first charge–discharge cycle are investigated by scanning electron microscopy (SEM) and X-ray powder diffraction (XRD). AEC decomposes and forms a proper solid electrolyte interphase (SEI) film on the MCMB surface. The SEI film not only prevents exfoliation of the graphite electrode but also stabilizes the electrolyte. AEC helps to improve the cycleability of lithium-ion batteries to a considerable extent.