Title Page
Abstract in Korean
Abstract in English
Contents
1. Introduction 13
1.1. Lithium ion batteries 13
1.2. The components of lithium ion batteries 15
1.2.1. Active materials 15
1.2.2. Inactive materials 16
1.3. Rheology 18
1.4. Necessity of rheology research 21
2. Experimental 22
2.1. Materials 22
2.2. Sample Preparation 22
2.3. Rheological character 24
2.3.1. Amplitude sweep test 26
2.3.2. Frequency sweep test 26
2.3.3. Flow sweep test 26
3. Results and discussion 27
3.1. CMC and SBR binder solution 27
3.2. SiO ratio in SiO/graphite slurry 29
3.3. Solid content of SiO/graphite slurry 36
3.4. SBR ratio in SBR/active material slurry 41
3.5. CMC ratio in SBR/active material slurry 43
3.6. SBR/CMC ratio in SBR/active material slurry 47
4. Conclusion 52
5. Reference 53
Table 1. The ratio of the components of the binder solution and components in slurry preparation 23
Table 2. The results of n and k depending on SiO % applied to the power law model 31
Figure 1. Schematic image of charging/discharging process of lithium ion battery 14
Figure 2. The molecular structure of (a) styrene butadiene rubber(SBR) and (b) sodium carboxymethyl cellulose(CMC) 17
Figure 3. (a) The equations and (b) the models for describing the behavior of a fluid 20
Figure 4. Measuring process of rheological properties of SiO/graphite anode slurry of LIB 25
Figure 5. The results of (a) viscosity vs. shear rate by flow sweep test, (b), (c) storage/loss moduli by frequency and amplitude sweep test 28
Figure 6. The results of the (a) viscosity and (b) shear stress vs. shear rate depending on SiO ratio in slurry 30
Figure 7. The results of (a) storage/loss moduli and (b) storage and (c) loss modulus by amplitude sweep test 34
Figure 8. (a) The definition of the equation of tan δ and (b) the result of tan δ of slurries 35
Figure 9. The results of viscosity vs. shear rate (a) from 10⁻² 1/s to 10³ 1/s and (b) around 10⁻¹ 1/s 37
Figure 10. The results of (a) storage and (b) loss modulus depending on solid content % by frequency sweep test 38
Figure 11. The results of (a) storage and (b) loss modulus by amplitude sweep test 40
Figure 12. The results of (a) viscosity vs. shear rate by flow sweep test and (b) storage and (c) loss modulus depending on SBR ratio in slurry by frequency sweep test 42
Figure 13. The results of (a) storage/loss moduli, (b) storage and (c) loss modulus depending on CMC ratio in slurry by amplitude sweep test 44
Figure 14. The result of viscosity vs. shear rate by flow sweep test 46
Figure 15. The results of (a) storage/loss moduli, (b) storage and (c) loss modulus depending on SBR/CMC ratio in slurry by amplitude sweep test 48
Figure 16. The results of (a) storage/loss moduli, (b) storage and (c) loss modulus by frequency sweep test 49
Figure 17. The result of viscosity vs. shear rate by flow sweep test 51