Improved cycling performance of Si nanoparticle anodes via incorporation of methylene ethylene carbonate

Methylene ethylene carbonate (MEC) has been investigated as an alternative additive to fluoroethylene carbonate (FEC) for Si nanoparticle anodes cycled with 1.2M LiPF6/ethylene carbonate (EC): diethyl carbonate (DEC) (1:1, w/w) electrolyte. The Si electrodes cycled with 10% MEC-added electrolyte exh...

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Bibliographic Details
Published in:Electrochemistry communications 2016-05, Vol.66 (C), p.71-74
Main Authors: Nguyen, Cao Cuong, Lucht, Brett L.
Format: Article
Language:English
Subjects:
Electrolyte additive
Methylene ethylene carbonate
Silicon anode
Solid electrolyte interphase
Surface analysis
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Summary:Methylene ethylene carbonate (MEC) has been investigated as an alternative additive to fluoroethylene carbonate (FEC) for Si nanoparticle anodes cycled with 1.2M LiPF6/ethylene carbonate (EC): diethyl carbonate (DEC) (1:1, w/w) electrolyte. The Si electrodes cycled with 10% MEC-added electrolyte exhibit significantly improved capacity retention after 100cycles compared to standard electrolyte (73% vs 46%). In addition, the Si electrode cycled with MEC additive has less damage from cracking than the standard electrolyte. Ex situ surface analyses via infrared and X-ray photoelectron spectroscopy reveal a solid electrolyte interphase (SEI) containing a high concentration of a poly(MEC), which is likely responsible for the improved performance of Si anodes. [Display omitted] •Effects of MEC on cycling ability of Si nanoparticle anodes was investigated.•MEC greatly improved capacity retention of Si anode compared to standard electrolyte.•High concentration of poly(MEC) was found in MEC-derived SEI.
ISSN:1388-2481
1873-1902
DOI:10.1016/j.elecom.2016.03.005