Title Page
Contents
ABSTRACT 9
Ⅰ. Introduction 11
Ⅱ. Experimental procedure 14
2.1. Chemicals 14
2.2. Synthesis 14
2.3. Material characterizations 15
2.4. Electrochemical measurements 15
Ⅲ. Results and discussion 17
3.1. Material characterizations 17
3.2. Electrochemical characterizations 26
Ⅳ. Conclusion 36
References 37
Appendix 45
Abstract (in Korean) 49
〈Table 1〉 Electrochemical performance of the Si-based anode material for LIBs 30
〈Figure. 1〉 Schematic illustration of the synthesis of Si/rGO/SiOC composite 18
〈Figure. 2〉 (a) FT-IR spectra of SiNP, TA-coated Si, and TA-containing Si/rGO; (b) XRD patterns, (c) Raman spectra, and (d) TGA curves of... 21
〈Figure. 3〉 XPS spectra of SiOC, Si/SiOC, and Si/rGO/SiOC composite: (a) C 1s, (b) Si 2p, and (c) O 1s 23
〈Figure. 4〉 Low-magnified TEM images and HR-TEM images with inset showing the lattice fringes of Si in: (a) Si/SiOC, and (b) Si/rGO/SiOC... 25
〈Figure. 5〉 FE-SEM images of: (a) Si/SiOC and (b) Si/rGO/SiOC composites 26
〈Figure. 6〉 Voltage profiles for the initial three cycles at 0.1 A g⁻¹ of (a) Si/SiOC, (b) Si/rGO/SiOC, and (c) Si/rGO electrodes 27
〈Figure. 7〉 (a) Comparison of cycle performance of Si/rGO, Si/SiOC, and Si/rGO/SiOC electrodes; (b) rate performance of Si/SiOC, and Si/rGO/SiOC... 29
〈Figure. 8〉 Kinetic analysis of the electrochemical behavior towards Li⁺ of Si/SiOC and Si/rGO/SiOC electrodes: (a) CV profiles at various... 33
〈Figure. 9〉 Nyquist plots of Si/SiOC and Si/rGO/SiOC electrode: (a) after 1 cycle, and (b) 100 cycles at 0.5 A g⁻¹, and the equivalent... 34
〈Figure. 10〉 Cross-sectional FE-SEM images of the (a) Si/SiOC and (b) Si/rGO/SiOC electrodes at the pristine, 1st lithiated/delithiated, and...[이미지참조] 35