Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Thermal Stability of Lithiated Silicon Anodes with Electrolyte

  • Park, Yoon-Soo (Department of Advanced Materials Science and Engineering, Kangwon National University) ;
  • Lee, Sung-Man (Department of Advanced Materials Science and Engineering, Kangwon National University)
  • Received : 2010.09.14
  • Accepted : 2010.11.04
  • Published : 2011.01.20
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Abstract

The thermal behavior of lithiated Si anodes has been investigated using differential scanning calorimetry (DSC). In particular, the effect of Si particle size on the thermal stability of a fully lithiated Si electrode was investigated. For DSC measurements, a lithiated Si anode was heated in a hermetically sealed high-pressure pan with a polyvinylidene fluoride (PVDF) binder and a 1 M $LiPF_6$ solution in an ethylene carbonate (EC)-diethyl carbonate (DEC) mixture. The thermal evolution around $140^{\circ}C$ increases with lithiation and with decreasing particle size; this phenomenon is attributed to the thermal decomposition of the solid electrolyte interface (SEI) film. Exothermic peaks, following a broad peak at around $140^{\circ}C$, shift to a lower temperature with a decrease in particle size, indicating that the thermal stability of the lithiated Si electrode strongly depends on the Si particle size.

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References

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