Title Page
Abstract
Contents
CHAPTER 1. Introduction 11
CHAPTER 2. Experimental 13
2.1. Materials and Cell preparation 13
2.2. Sample preparation and characterization 14
CHAPTER 3. Results and Discussion 16
3.1. Electrochemical measurements of cycles cells 16
3.2. Molphologies of cycles electodes 21
3.3. Compositional analysis of SEI 27
3.4. GC-MSD analysis of decomposed electrolytes 32
CHAPTER 4. Conclusion 37
References 39
Table 1. ratio of EC and EMC, and additive volume percentage of collected electrolyte for cycled cells. 36
Figure 1. Plots of discharge capacity vs. cycle numbers for coin cells with graphite||Li and SiOx@C||Li cells.[이미지참조] 19
Figure 2. Plots of differential capacity (dQ/dV) vs. potential for coin cells with graphite||Li and SiOx@C||Li.[이미지참조] 20
Figure 3. SEM images of graphite electrode without additive after cycles in the following; (a), (d) activation (10 cycles at 0.2 C); (b), (e) 10 cycles at 1 C after... 24
Figure 4. SEM images of graphite electrode with 5 vol.% VC after cycles in the following; (a), (d) activation (10 cycles at 0.2 C); (b), (e) 10 cycles at 1 C after... 24
Figure 5. SEM images of graphite electrode with 5 vol.% FEC after cycles in the following; (a), (d) activation (10 cycles at 0.2 C); (b), (e) 10 cycles at 1 C after... 25
Figure 6. SEM images of SiOx@C electrode without additive after cycles in the following; (a), (d) activation (10 cycles at 0.2 C); (b), (e) 10 cycles at 1 C after...[이미지참조] 25
Figure 7. SEM images of SiOx@C electrode with 5 vol.% VC after cycles in the following; (a), (d) activation (10 cycles at 0.2 C); (b), (e) 10 cycles at 1 C after...[이미지참조] 26
Figure 8. SEM images of SiOx@C electrode with 5 vol.% FEC after cycles in the following; (a), (d) activation (10 cycles at 0.2 C); (b), (e) 10 cycles at 1 C after...[이미지참조] 26
Figure 9. XPS for graphite anodes after activation (top) and 100 cycles (bottom) under various electrolyte conditions. 29
Figure 10. XPS for SiOx@C anodes after activation (top) and 100 cycles (bottom) under various electrolyte conditions.[이미지참조] 31
Figure 11. Gas chromatography for collected electrolyte of tested cells after various cycling conditions. 33
Figure 12. Left amount of electrolyte components for cycled cells. VG means VC-graphite, VS means VC-SiOx@C, FG means FEC-graphite and FS means FEC-SiOx@C.[이미지참조] 36