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Unveiling the intrinsic reaction between silicon-graphite composite anode and ionic liquid electrolyte in lithium-ion battery

Wu, Rui; Liu, Xianqiang; Zheng, Yijing; Li, Yonghe; Shi, Huifeng; Cheng, Xiaopeng; Pfleging, Wilhelm; Zhang, Yuefei

Abstract:
Due to the excellent theoretical capacity, silicon-based electrodes have been extensively studied to develop high energy-density lithium-ion batteries (LIBs). Nevertheless, the large volume expansion and unfavorable interface seriously hamper its application, and the underlying physics behind are still unclear. In this work, using in-situ environment scanning electron microscopy (ESEM), the morphological evolution of composite silicon-graphite electrodes with different ionic liquids as electrolytes are compared in the range of 20 °C–60 °C. Surprisingly, combining the microstructure and surface reaction products from transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS), it finds out that the fully reaction of lithium-silicon does not generate huge volume expansion, while the side reaction between graphite and electrolyte decomposition products causes dramatic volume expansion and hinders the further lithiation of silicon. On the other hand, the electrolyte which is capable of rapidly releasing F− to form LiF-rich solid electrolyte interphase (SEI) is favorable to maintain the structure integrity and cycling performance. ... mehr



Originalveröffentlichung
DOI: 10.1016/j.jpowsour.2020.228481
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2020
Sprache Englisch
Identifikator ISSN: 0378-7753
KITopen-ID: 1000122159
HGF-Programm 37.01.02 (POF III, LK 01)
Components and Cells
Erschienen in Journal of power sources
Band 473
Seiten Article: 228481
Projektinformation DFG, DFG EIN, PF 392/9-1
Schlagwörter KNMF 2018-019-021333 LMP
Nachgewiesen in Scopus
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