【摘 要】
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The crystal-oriented silicon micropillar array platforms were prepared by microfabrication processes for the pur-pose of electrolyte additive identification.Th
【机 构】
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Guangxi Key Laboratory of Automatic Detecting Technology and Instrument,Guilin University of Electro
论文部分内容阅读
The crystal-oriented silicon micropillar array platforms were prepared by microfabrication processes for the pur-pose of electrolyte additive identification.The silicon micropillar array platform was used for the study of fluorinated vinyl carbonate (FEC),vinyl ethylene carbonate (VEC),ethylene sulfite (ES),and vinyl carbonate (VC) electrolyte additives in the LiPF6 dissolved in a mixture of ethylene carbonate and diethyl carbonate electrolyte system using charge/discharge cycles,electrochemical impedance spectroscopy,cyclic voltammetry,scanning electron microscopy,and x-ray photo-electron spectroscopy.The results show that the silicon pillar morphology displays cross-shaped expansion after lithia-tion/delithiation,the inorganic lithium salt keeps the silicon pillar morphology intact,and the organic lithium salt content promotes a rougher silicon pillar surface.The presence of poly-(VC) components on the surface of FEC and VC elec-trodes allows the silicon pillar to accommodate greater volume expansion while remaining intact.This work provides a standard,fast,and effective test method for the performance analysis of electrolyte additives and provides guidance for the development of new electrolyte additives.
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