Title Page
Contents
Abstracts 12
Chapter 1. Introduction 14
1.1. Components of all solid-state batteries 14
1.1.1. Cathode 16
1.1.2. Anode 18
1.1.3. Solid-state electrolyte 19
1.1.4. Conductive agents, current collector 21
1.2. Cell types of All solid-state batteries 22
1.2.1. Pellet cell 22
1.2.2. Coin cell 22
1.2.3. Pouch-type cell 23
1.3. Recent issue of all solid-state battery 26
1.4. Aims of our research 27
1.5. References 28
Chapter 2. Design of NCM 82% Composite Electrode 31
2.1. Introduction 31
2.2. Experimental 33
2.2.1. Manufacture of electrode 33
2.2.2. Cell fabrication and electrochemical tests 33
2.2.3. Electrochemical impedance spectroscopy (EIS) 34
2.2.4. Field emission scanning electron microscope (FE-SEM) 34
2.3. Electrochemical and physical property analysis 37
2.4. Results and discussion 40
2.5. Conclusion 45
2.6. References 46
Chapter 3. LiNbO₃ coated NCM particles 47
3.1. Introduction 47
3.2. Experimental 48
3.2.1. LiNbO₃ coated process 48
3.2.2. Field emission scanning electron microscope-energy dispersive spectrometer (FE-SEM) 48
3.2.3. Energy dispersive X-ray spectroscopy (EDS) 49
3.2.4. Cell fabrication and electrochemical test 49
3.3. Result and discussion 53
3.3.1. Dependent of LiNbO₃ coated thickness 53
3.3.2. Electrochemical performance with carbon composite 53
3.4. Conclusion 57
3.5. References 58
Chapter 4. Raman spectroscopy analysis 59
4.1. Introduction 59
4.2. Experimental 60
4.2.1. Degradation of solid-state electrolyte with carbon conductive agents 60
4.2.2. Raman spectroscopy 60
4.3. Results and discussion 61
4.4. Conclusion 67
4.5. References 68
Chapter 5. Enhancing electrochemical performance with binary carbon conductive agents 70
5.1. Introduction 70
5.2. Experimental 71
5.2.1. Cell fabrication and electrochemical test 71
5.2.2. Field emission scanning electron microscope (FE-SEM) 71
5.3. Results and discussion 74
5.4. Conclusion 75
5.5. References 76
Table 3.1. The process for LiNBO₃ coated active material with different... 48
Table 4.1. The Raman spectroscopy database 66
Figure 1.1. Illustration of lithium ion battery, the movement of Li+...(이미지참조) 15
Figure 1.2. Approximate range of average discharge specific capacity of... 17
Figure 1.3. (a) The ionic conductivity and (b) stability voltage window... 20
Figure 1.4. The structure of pellet-type all solid-state battery... 24
Figure 1.5. Schematic of assemble of 2032 coin cell for the batteries used in experiments. 24
Figure 1.6. Schematic of a pouch-type all solid-state battery composed. (a,b) the... 25
Figure 2.1. (a) Schematic diagram of mixing process for NCM 82% and... 32
Figure 2.2. (a) Images of dry mixing process with all components such as active... 35
Figure 2.3. Schematic of the assemble process for our all-solid-state batteries. 36
Figure 2.4. Surface SEM images of each materials. NCM 82%, Li6PS5Cl, VGCF, Super P(이미지참조) 38
Figure 2.5. (a,b) Scanning electron microscope images of cathode composite... 38
Figure 2.6. Energy dispersive X-ray spectroscopy (EDS) mapping images for... 39
Figure 2.7. Energy dispersive X-ray spectroscopy (EDS) mapping images for... 39
Figure 2.8. Electrochemical test data with various pressure were applied on electrode... 41
Figure 2.9. The dependent of electrode density with 85 : 15 (NCM 82% : LPSCl) at 1470... 41
Figure 2.10. Electrochemical impedance spectroscopy (EIS) of various electrode density... 42
Figure 2.11. Electrochemical impedance spectroscopy (EIS) of various electrode density at... 42
Figure 2.12. Voltage profile of the dependent of ball milling time with carbon... 43
Figure 2.13. (a) Comparison about electrochemical performance with various... 43
Figure 2.14. (a) Voltage profile of half-cell (SE-C) / LPSCl / Li-In at 1st charging... 44
Figure 3.1. Schematic diagram illustrating the synthesis progress for metal oxide... 50
Figure 3.2. Scanning electron microscope (SEM) images of the (a) 1 nm, (b) 3nm,... 50
Figure 3.3. Energy dispersive X-ray spectroscopy (EDS) mapping images and elemental... 51
Figure 3.4. Energy dispersive X-ray spectroscopy (EDS) mapping images and elemental... 51
Figure 3.5. Energy dispersive X-ray spectroscopy (EDS) mapping images and elemental... 52
Figure 3.6. Energy dispersive X-ray spectroscopy (EDS) mapping images and elemental... 52
Figure 3.7. The voltage profile and discharge specific capacity with various LiNbO3-... 54
Figure 3.8. The voltage profile of 3 nm LiNbO3-coated NCM with various carbon... 54
Figure 3.9. Electrochemical impedance spectroscopy (EIS) of various coated... 55
Figure 3.10. Electrochemical impedance spectroscopy (EIS) of various coated thickness... 56
Figure 4.1. Raman spectroscopy analysis at 1st lithiathion of (SE-C) / LPSCl / Li-In with... 63
Figure 4.2. Raman spectroscopy analysis of NCM 82% / LPSCl / Li-In at 10th... 63
Figure 4.3. Raman spectroscopy analysis of electrode composite (NCM : LPSCl :... 64
Figure 4.4. Raman spectroscopy analysis of electrode composite (NCM : LPSCl :... 64
Figure 4.5. Raman spectroscopy analysis of electrode composite (NCM : LPSCl :... 65
Figure 4.6. Raman spectroscopy analysis of electrode composite (NCM : LPSCl :... 65
Figure 5.1. The surface SEM images of electrode composite with binary carbon... 72
Figure 5.2. Schematic illustration that the variable structure of carbon... 72
Figure 5.3. Voltage profile analyzed the electrochemical performance of two... 73