Thermally Induced Reactions between Lithiated Nano-Silicon Electrode and Electrolyte for Lithium-Ion Batteries

  • Profatilova I
  • Langer T
  • Badillo J
 et al. 
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Abstract

The thermal stability of nano-silicon electrodes before and after lithiation was studied by means of differential scanning calorimetry (DSC). It was found that pristine Si electrodes heated in presence of EC/DEC 1M LiPF 6 electrolyte show exothermic reactions between sodium carboxymethylcellulose (Na CMC binder) and LiPF 6 . The products of thermal decomposition of a lithiated nano-Si electrode with electrolyte at different temperatures were identified using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). SEI layer was found to be responsible for the thermal reactions in the range between 77 and 107 • C. Exothermic events between 107 and 140 • C were caused by partial decomposition of LiPF 6 salt, which products initiated further transformations of SEI layer compounds and esterification of Na CMC. Interaction between nano-Li x Si and EC/DEC 1M LiPF 6 was the reason for the main exothermic peaks at temperatures between 150 and 300 • C. Nano-Li x Si heated with EC/DEC solvent mixture without LiPF 6 resulted in electrolyte decomposition at much lower temperatures (>105 • C). Therefore, the important role of LiPF 6 in the thermal stabilization of nano-Li x Si with electrolyte at temperatures

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Authors

  • Irina A. Profatilova

  • Thorsten Langer

  • Juan P. Badillo

  • André Schmitz

  • Hans Orthner

  • Hartmut Wiggers

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