Title Page
Contents
ABSTRACT 14
Ⅰ. INTRODUCTION 19
Ⅱ. MEASUREMENTS 24
1. Materials 24
2. Rheological measurements 26
3. Optical microscopic observation 27
Ⅲ. SEQUENCE OF PHYSICAL PROCESSES (SPP) ANALYSIS 30
Ⅳ. RESULTS AND DISCUSSION 35
1. Two-step yielding behavior 35
1.1. Two-step yielding behavior of anode slurries 35
1.2. Intra-cycle rheological transition in the first yielding region 38
1.3. Intra-cycle rheological transition in the second yielding region 42
1.4. Interactions between the components of an anode slurry 46
1.5. Physical origin of two-step yielding behavior 51
2. Effect of Binder on Rheological Properties 59
2.1. Yielding behavior according to the Mw of the binder 59
2.2. Analysis of the effect of low Mw CMC on the rheological properties of anode slurries 63
2.3. Analysis of the effect of medium Mw CMC on the rheological properties of anode slurries 71
2.4. Analysis of the effect of high Mw CMC on the rheological properties of anode slurries 79
3. Effect of Temperature on Rheological Properties 91
3.1. Effect of temperature on rheological properties of anode slurry 91
3.2. Effects of CMC on rheological properties 95
3.3. Effect of water molecules on rheological properties 97
3.4. Effect of Gr particles on rheological properties 99
Ⅴ. Conclusion 100
Ⅵ. Reference 102
ABSTRACT IN KOREAN 110
Figure 1.1. Typical electrode manufacturing process. The red box is the slurry process (fluid process) step. 20
Figure 2.1. Optical microscopic images of all diluted model slurries. 28
Figure 2.2. Binary images converted from optical microscope images. 29
Figure 3.1. Osculating plane and Frenet-Serret apparatus (tangent vector T→(t), normal vector N→(t), and binormal vector B→(t)) defined at two separate points, P→(t₁)...[이미지참조] 32
Figure 3.2. (a) Elastic Lissajous curve marked with green points indicating the region of interest. (b) Description of the rheological transition with the Cole-Cole... 34
Figure 4.1. (a) Dynamics strain sweep test result and (b) dynamic stress sweep test result of lithium-ion battery anode slurry of 49 wt% graphite (Gr), 2 wt% carbon... 36
Figure 4.2. (a) Dynamics strain sweep test result and (b) dynamic stress sweep test result of lithium-ion battery anode slurry of 49 wt% graphite (Gr), 2 wt% carbon... 37
Figure 4.3. SPP analysis of the intra-cycle rheological transition in the first yielding region at a frequency of 1 rad/s. (a) Elastic Lissajous curve, (b) Cole-Cole plot at... 40
Figure 4.4. SPP analysis of the intra-cycle rheological transition in the first yielding region: (a) Elastic Lissajous curve, (b) Cole-Cole plot at strain amplitude γ₀=0.5, (c)... 41
Figure 4.5. SPP analysis of the intra-cycle rheological transition in the second yielding region at a frequency of 1 rad/s. (a) Elastic Lissajous curve, (b) Cole-Cole... 44
Figure 4.6. SPP analysis of the intra-cycle rheological transition in the second yielding region: (a) Elastic Lissajous curve, (b) Cole-Cole plot at strain amplitude... 45
Figure 4.7. Dynamics strain sweep results of Gr-CMC and CB-CMC slurries of various compositions at a frequency of 1 rad/s. 47
Figure 4.8. Dynamic strain sweep results of Gr-CMC and CB-CMC slurries of various compositions at 10 rad/s. 48
Figure 4.9. (a) Sedimentation of the Gr-CMC slurries with different ratios (after two weeks). (b) Schematic illustration of supernatant and precipitate in the Gr-CMC... 50
Figure 4.10. Elastic modulus (G') of 250,000 CMC aqueous solution at 10 rad/s as a function of CMC concentration. 52
Figure 4.11. Dynamic strain sweep results of the anode slurry, Gr-CMC slurry, and CMC aqueous solution at a frequency of 1 rad/s. 54
Figure 4.12. Dynamic strain sweep results of the anode slurry, Gr-CMC slurry, and CMC aqueous solution at 10 rad/s. 55
Figure 4.13. (a) Cole-Cole plot of the anode slurries, Gr-CMC slurries, and CMC aqueous solutions at a strain amplitude of 10 and frequency of 1rad/s. (b) Normalized... 57
Figure 4.14. (a) Cole-Cole plot of the anode slurries, Gr-CMC slurries, and CMC aqueous solutions at strain amplitude of 10 and frequency of 10rad/s. (b) Normalized... 58
Figure 5.1. G49CB2CMC1.9 anode slurries made with various molecular weights (a) 90,000 CMC slurry (b) 250,000 CMC slurry (c) 700,000 CMC slurry. 60
Figure 5.2. Dynamic strain sweep test result for G49CB2CMC1.9 anode slurries made with various molecular weights (a) 90,000 CMC slurry (b) 250,000 CMC... 61
Figure 5.3. Dynamic strain sweep results of the 90,000 CMC slurry of various compositions made with CMC at a frequency of 10rad/s. 64
Figure 5.4. SPP analysis of the 90,000 CMC slurries of various compositions made with CMC of the intra-cycle rheological transition at a frequency of 10 rad/s and... 65
Figure 5.5. Estimated microstructure of 90,000 CMC slurries. (a) slurry with low CMC concentration. (b) slurry with high CMC concentration. The friction that may... 67
Figure 5.6. Optical microscope image of diluted 90,000 CMC slurries. (a) G49CMC1.9 slurry. (b) G49CMC2.2 slurry. (c) G49CMC3 slurry. 68
Figure 5.7. Binary image of an optical microscope image of diluted 90,000 CMC slurries. (a) G49CMC1.9 slurry. (b) G49CMC2.2 slurry. (c) G49CMC3 slurry. 69
Figure 5.8. Pore Size Distribution (PDS) analysis result of 90,000 CMC slurries. 70
Figure 5.9. Dynamic strain sweep results of 250,000 CMC slurries of various compositions made with CMC at a frequency of 10rad/s. 72
Figure 5.10. SPP analysis of 250,000 CMC slurries of various compositions made with CMC of the intra-cycle rheological transition at a frequency of 10 rad/s and... 73
Figure 5.11. Estimated microstructure of 250,000 CMC slurries. (a) slurry with low CMC concentration. (b) slurry with high CMC concentration. The friction that may... 75
Figure 5.12. Optical microscope image of diluted 250,000 CMC slurries. (a) G49CMC1 slurry. (b) G49CMC1.9 slurry. (c) G49CMC3 slurry. 76
Figure 5.13. Binary image of an optical microscope image of diluted 250,000 CMC slurries. (a) G49CMC1 slurry. (b) G49CMC1.9 slurry. (c) G49CMC3 slurry. 77
Figure 5.14. Pore Size Distribution (PDS) analysis result of 250,000 CMC slurries. 78
Figure 5.15. Dynamic strain sweep results of 700,000 CMC slurries of various compositions made with CMC at a frequency of 10rad/s. 81
Figure 5.16. Dynamic strain sweep results of G49CB2CMC1.9 700,000 CMC slurry and 700,000 CMC5 aqueous solution at a frequency of 10rad/s. 82
Figure 5.17. SPP analysis of anode slurries of various compositions made with 700,000 g/mol CMC of the intra-cycle rheological transition at a frequency of 10... 83
Figure 5.18. Estimated microstructure of 700,000 CMC slurries. (a) slurry with low CMC concentration. (b) slurry with high CMC concentration. The friction that may... 85
Figure 5.19. Optical microscope image of diluted 700,000 slurries. (a) G49CMC0.4 slurry. (b) G49CMC0.8 slurry. (c) G49CMC1.9 slurry. 86
Figure 5.20. Binary image of an optical microscope image of diluted 700,000 CMC slurries. (a) G49CMC0.4 slurry. (b) G49CMC0.8 slurry. (c) G49CMC1.9 slurry. 87
Figure 5.21. Pore Size Distribution (PDS) analysis result of 700,000 CMC slurries. 88
Figure 5.22. Table of results of rheological properties of slurries according to the molecular weight and concentration of CMC. As a result of the dynamic strain sweep... 90
Figure 6.1. Dynamic strain sweep test results for G49CB2CMC1.9 250,000 CMC slurry at a frequency of 10 rad/s measured at different temperatures. 92
Figure 6.2. Dynamic strain sweep test results for G35CB2.2CMC1.4 anode slurry at a frequency of 10 rad/s measured at different temperatures. 93
Figure 6.3. Experiment to visually check the change in rheological properties through the G35CB2.2CMC1.4 anode slurry. 94
Figure 6.4. Result of dynamic strain sweep test of CMC5 aqueous solution measured at various temperatures at a frequency of 10rad/s. 96
Figure 6.5. A clathrate cage structure in which water molecules are arranged around Gr particles when Gr particle is immersed in water. 98