کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
190571 | 459701 | 2010 | 6 صفحه PDF | دانلود رایگان |
Synchrotron based in situ X-ray powder diffraction was applied for the investigation of the PF6− intercalation behaviour into graphite of different particle size and various crystallinity at very positive potentials above 5 V vs. Li/Li+. In a propylene carbonate based electrolyte, small particles with low crystallinity show almost no anion intercalation and the particle structure remains intact. In graphite particles with increased particle size and/or higher crystallinity PF6− intercalation up to a stage 4 phase occurs but the reversibility is poor and exfoliation of graphene layers takes place as it was proven by post-mortem scanning electron microscopy. Thus, graphites with small particles and less crystallinity are preferred as conductive additive in positive “high voltage” cathodes in terms of structural integrity.
Journal: Electrochimica Acta - Volume 55, Issue 17, 1 July 2010, Pages 4964–4969