Allyl cyanide as a new functional additive in propylene carbonate-based electrolyte for lithium-ion batteries
Allyl cyanide (AC) was investigated as a film-forming additive in propylene carbonate (PC)-based electrolytes for graphite anode in lithium-ion batteries. The film-forming behavior of AC was characterized with cyclic voltammetry, electrochemical impedance spectroscopy, scanning electron microscopy, and Fourier transform infrared spectroscopy. By adding 2 wt% AC in the electrolyte of 1 M LiPF6-PC/DMC (1:1, in vol), the exfoliation of graphite anode was effectively suppressed over cycling. Graphite/Li half-cell showed an initial coulombic efficiency of 75 % and a specific capacity of 300 mAh/g after 48 cycles. A possible reductive polymerization mechanism of AC on the surface of graphite was proposed.
KeywordsLithium-ion battery Propylene carbonate Additive Solid electrolyte interphase
This work was supported by the National Science Foundation of China (50973112), the Hundred Talents Program of the Chinese Academy of Sciences (CAS), CAS-Guangdong Collaboration Program (20108), and Science & Technology Project of Guangzhou (11A44061500).
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