Electrochemical Decomposition of Poly(Vinylidene Fluoride) Binder for a Graphite Negative Electrode in Lithium-Ion Batteries

Abstract:

To clarify the electrochemical decomposition of poly (vinylidene fluoride) (PVdF) used as a binder for lithium-ion batteries while simultaneously verifying the correlation between electrode resistance and the PVdF content in graphite negative electrodes, in this study, we applied lithium bis (trifluoromethanesulfonyl) imide, which suppresses graphite exfoliation, as a salt. As a result, the electrochemical decomposition of PVdF was observed at a higher potential than that at which the electrolyte was decomposed during the reduction process. Additionally, this study demonstrated (through electrochemical impedance spectroscopy analysis) that electrode resistances such as solid electrolyte interface and charge transfer resistance proportionally increased with the PVdF content.

• Periodical: Materials Science Forum (Volume 893)
• Pages: 127-131
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.893.127
• Online since: March 2017
• Authors: Min Ji Kim, Chang Hee Lee, Mun Hui Jo, Soon Ki Jeong*
• Keywords: Graphite Negative Electrode, Lithium Bis(Trifluoromethanesulfonyl)Imide, Lithium-Ion Battery, Poly(Vinylidene Fluoride) Binder

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