표제지
목차
요약 9
Abstract 10
제1장 서론 12
제2장 이론적 배경 15
2.1. 리튬이온 배터리 (Lithium Ion Battery, LIB) 15
2.2. 리튬 금속 음극 18
제3장 실험 방법 21
3.1. 집전체 배후 공간을 활용한 리튬 금속 음극 21
3.2. 평면형 구조체 제조 23
3.2.1. 소-리튬 절연층 코팅 23
3.2.2. 친-리튬 전도층 코팅 25
3.2.3. 리튬 이온 통로 제작 28
3.3. 특성 평가 31
3.3.1. Half-cell 특성 평가 31
3.3.2. Full-cell 특성 평가 32
제4장 결과 및 고찰 33
4.1. 리튬 전착 위치 제어 33
4.1.1. 충전용량에 따른 리튬 전착 위치제어 33
4.1.2. 충전용량에 따른 리튬 정량분석 38
4.2. 음극 구조체 전기화학적 특성 평가 및 분석 44
4.3. 기존 집전체와 신 음극 구조체의 비교를 통한 평가 및 분석 50
제5장 결론 57
제6장 참고문헌 59
Table. 4.1. Charge capacity of anode structure 33
Table. 4.2. Li atomic percent of anode structure front side by charging capacity 41
Table. 4.3. Li atomic percent of anode structure back side by charging capacity 42
Table. 4.4. Measurement of Li according to charging capacity on the mesh(spacer) by ICP analysis. 43
Fig. 2.1. Schematic diagram of the lithium ion battery 17
Fig. 2.2. Schematic showing the Li stripping/plating process 19
Fig. 2.3. (a) Cu foil (b) Optical microscope image Li dendrites (c) Whisker-like Li deposition... 20
Fig. 3.1. Schematic conceptual diagram of 3-D anode structure with inner space for Li-deposition [1] Lithiophobic area (insulating... 22
Fig. 3.2. Schematic presentation of the 3-D anode structure 22
Fig. 3.3. (a) None coating copper foil, (b) PVA insulating coating layer on copper foil 24
Fig. 3.4. Optical microscope images of (a),(b) none coating stainless mesh, (c),(d) ZnO nanorod coating mesh. SEM images of... 26
Fig. 3.5. SEM images of ZnO nanorod. (a) X5000, (b) X10000, (c) X50000, (d) X100000 27
Fig. 3.6. Scheme images of manufacturing process. [1] Solution preparation, [2] PVA insulating(Lithiophobic) coating, [3] Forming... 29
Fig. 3.7. (a), (a-1) Images of arrayed needle punching module, (b) Image of Li path, pitch of hole, hole size, (c) Scheme image pitch... 30
Fig. 4.1. Optical microscope images of Cu anode structure front site by charge capacity. (a) 0 mAh/cm²,(b) 1.0 mAh/cm²,(c) 2.0... 35
Fig. 4.2. Optical microscope images of Cu anode structure opposite site by charge capacity. (a) 0 mAh/cm²,(b) 1.0 mAh/cm²,(c) 2.0... 36
Fig. 4.3. Optical microscope images of Cu anode structure. Comparison of lithiation (plating), De-lithiation (stripping)... 37
Fig. 4.4. XPS spectrum of anode structure front side charged 1mAh/cm² (a), 4mAh/cm² (c), back side charged 1mAh/cm² (b),... 40
Fig. 4.5. Li atomic percent of anode structure front side by charging capacity 41
Fig. 4.6. Li atomic percent of anode structure back side by charging capacity 42
Fig. 4.7. Measurement of Li according to charging capacity on the mesh(spacer) by ICP analysis. 43
Fig. 4.8. Electrochemical properties of cell without additional irreversible capacity. 1M LiTFSI + 5 wt% LiNO₃ in DOL/DME (1/1,... 45
Fig. 4.9. Electrochemical properties of cell with additional irreversible capacity. 1M LiTFSI + 5 wt% LiNO₃ in DOL/DME (1/1,... 46
Fig. 4.10. SEM images of none charging anode structure (a) Lithiophobic area, (b) Holes for Li ion path, (c),(d) Lithiophilic... 47
Fig. 4.11. SEM images of anode structure after 100 cycle (a) Lithiophobic area, (b) Holes for Li ion path, (c),(d) Lithiophilic... 48
Fig. 4.12. (a) Full-cell charge-discharge profiles consist of anode structure and high nickel NCM 49
Fig. 4.13. Electrochemical properties by capacity per unit area Copper current collector (a) 1 mAh/cm² - 1C,... 52
Fig. 4.14. Coulombic efficiency by capacity per unit area Copper current collector (a) 1 mAh/cm² - 1C,... 53
Fig. 4.15. Measurement of none charging anode structure (a), copper current collector (c),... 54
Fig. 4.16. SEM images of Li electrodeposition morphology on copper current collector, reference 0 cycle (a), 1 cycle (b), 50 cycle... 55
Fig. 4.17. SEM images of Li electrodeposition morphology in the inserted mesh, reference 0 cycle (a), 1 cycle (b),... 56