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Choi, Nam-Soon
Energy Materials Lab
Research Interests
  • Rechargeable lithium battery, electrolytes for next generation Mg and Na battery

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Thermal reactions of lithiated graphite anode in LiPF6-based electrolyte

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Title
Thermal reactions of lithiated graphite anode in LiPF6-based electrolyte
Author
Choi, Nam-SoonProfatilova, Irina A.Kim, Sung-SooSong, Eui-Hwan
Keywords
DSC; FT-IR; LiPF6; Lithiated graphite anode; Thermal decomposition
Issue Date
2008-12
Publisher
ELSEVIER SCIENCE BV
Citation
THERMOCHIMICA ACTA, v.480, no.1-2, pp.10 - 14
Abstract
The thermal reactions of a lithiated graphite anode with and without 1.3 M lithium hexafluorophosphate (LiPF6) in a solvent mixture of ethylene carbonate(EC) and ethylmethyl carbonate (EMC) were investigated by means of differential scanning calorimetry (DSC). The products of the thermal decomposition occurring on the lithiated graphite anode were characterized by Fourier transform infrared (FT-IR) analysis. The lithiated graphite anode showed two broad exothermic peaks at 270 and 325 degrees C, respectively, in the absence of electrolyte. It was demonstrated that the first peak could be assigned to the thermal reactions of PF5 with various linear alkyl carbonates in the solid electrolyte interphase (SEI) and that the second peak was closely related to the thermal decomposition of the polyvinylidene fluoride (PVdF) binder. In the presence of electrolyte, the lithiated graphite anode showed the onset of an additional exothermic peak at 90 degrees C associated with the thermal decomposition reactions of the SEI layer with the organic solvents.
URI
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DOI
10.1016/j.tca.2008.09.017
ISSN
0040-6031
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ECHE_Journal Papers
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