Journal
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume 32, Issue 1, Pages 145-148Publisher
KOREAN CHEMICAL SOC
DOI: 10.5012/bkcs.2011.32.1.145
Keywords
Li-ion battery; Si anode; Thermal stability; DSC
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Funding
- Ministry of Knowledge Economy (MKE)
- Korea Institute for Advancement of Technology (KIAT) through the Research and Development for Regional Industry [70005106]
- Korea Institute of Industrial Technology(KITECH) [70005106] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 I M LiPF6 solution in an ethylene carbonate (EC)-diethyl carbonate (DEC) mixture. The thermal evolution around 140 degrees 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 degrees 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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