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Hong, Sung You
Synthetic Organic Chemistry Laboratory
Research Interests
  • Synthetic organic chemistry, transition metals, oxidation state

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Understanding the thermal instability of fluoroethylene carbonate in LiPF6-based electrolytes for lithium ion batteries

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Title
Understanding the thermal instability of fluoroethylene carbonate in LiPF6-based electrolytes for lithium ion batteries
Author
Kim, KoeunPark, InbokHa, Se-YoungKim, YeonkyoungWoo, Myung-HeuiJeong, Myung-HwanShin, Woo CheolUe, MakotoHong, Sung YouChoi, Nam-Soon
Keywords
Lithium-ion battery; LiPF6-based electrolyte; Fluoroethylene carbonate; Lewis acid; Thermal instability
Issue Date
201701
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.225, no., pp.358 - 368
Abstract
The cycling and storage performances of LiCoO2 (LCO)-LiNi0.5Co0.2Mn0.3O2 (NCM)/pitch-coated silicon alloy-graphite (Si-C) full cells with ethylene carbonate (EC)–based and fluoroethylene carbonate (FEC)–based electrolytes are investigated at elevated temperatures. Excess FEC (used as a co-solvent in LiPF6-based electrolytes), which is not completely consumed during the formation of the solid electrolyte interphase (SEI) layer on the electrodes, is prone to defluorination in the presence of Lewis acids such as PF5; this reaction can generate unwanted HF and various acids (H3OPF6, HPO2F2, H2PO3F, H3PO4) at elevated temperatures. Our investigation reveals that the HF and acid compounds that are formed by FEC decomposition causes significant dissolution of transition metal ions (from the LCO-NCM cathode) into the electrolyte at elevated temperatures; as a result, the reversible capacity of the full cells reduces because of the deposition of the dissolved metal ions onto the anode. Moreover, we demonstrate possible mechanisms that account for the thermal instability of FEC in LiPF6-based electrolytes at elevated temperatures using model experiments.
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DOI
http://dx.doi.org/10.1016/j.electacta.2016.12.126
ISSN
0013-4686
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