표제지
목차
논문요약 11
영문초록 12
Ⅰ. 서론 13
Ⅱ. 이론적 배경 17
Ⅲ. 연구 방법 20
1. 탄소나노튜브 기반 황 양극 제작 20
2. 인 도핑된 탄소 및 인 도핑된 탄소 코팅 분리막 제작 22
3. 전기화학적 평가 24
4. 특성 평가 25
Ⅳ. 연구 결과 26
1. 고로딩 황 플렉시블 양극 26
2. 인 도핑된 탄소 중간층 30
3. 인 도핑된 탄소 중간층의 다기능 억제 효과 40
4. 리튬황 전지의 전기화학적 성능 45
5. 유연한 리튬황 전지 51
Ⅴ. 논의(고찰) 55
참고문헌 56
Figure 1. Lithium sulfur battery : Discharge and charge process 18
Figure 2. Schematic image of Shuttle effect and Lithium dendrite 19
Figure 3. Schematics of the CNT-based high-S-loading cathode preparation process, and a digital camera image of the flexible... 21
Figure 4. A process flow for the P-doped carbon composite with a polymer binder(Carbon@P@PVDF) and its solution-based blade... 23
Figure 5. X-ray diffraction patterns of the elemental S, pristine MWCNT, and MWCNT@S films 27
Figure 6. Digital camera image of the CNT-based free-standing S cathode, and scanning electron microscopy (SEM) image of the CNT-... 29
Figure 7. Structures of the flexible Li-S batteries and infiltration behavior of the liquid electrolyte on a PE membrane 32
Figure 8. The pore size distribution plot of (a) SPB and (b) YP 33
Figure 9. a) Cross-section SEM images of the P-doped carbon interlayer (thickness=30 µm). b, d) Their SEM images and c, e) EDS... 34
Figure 10. UV-vis absorption profiles of the Li2Sx solutions, inset: digital camera image of the LiPSs (Li₂S₈) solutions before and after... 36
Figure 11. Contact angle measurement of the liquid electrolyte on a) bare PE and b) YP@SPB@P-coated PE separators 37
Figure 12. Photographs showing the diffusion properties of the Li₂Sx solution through the various separators. a) The P-doped carbon...[이미지참조] 39
Figure 13. Photographs of the disassembled Li-S cells after 50 cycles: a) PE separator anode side with the YP@SPB@P interlayer-... 42
Figure 14. Nyquist plots of the Li-S cells representing the characterization of the electrochemical impedance spectra a) after the... 43
Figure 15. XRD patterns of the a) Li metal anodes after 50 cycles: pristine Li and those with bare PE and a P-doped carbon interlayer... 44
Figure 16. Discharge capacity and Coulombic efficiency of the Li-S cells based on the CNT-based freestanding S cathode and with the... 48
Figure 17. a) Galvanostatic charge/discharge profiles of the Li-S cells with a P-doped carbon interlayer (YP@SPB@P) at various C-... 49
Figure 18. a) Cycling performance profiles of the Li-S cells with a bare PE and P-doped carbon interlayer (YP@SPB@P)-coated PE... 50
Figure 19. a) Digital camera images showing the stable operation of a red LED based on the flexible Li-S battery under various deformation... 53
Figure 20. a) Volumetric energy densities (Wh Lcell⁻¹) of the flexible and freestanding Li-S cells as a function of the areal S-loading (gsulfur...[이미지참조] 54