DGIST Scholar: Analysis of Microstructure of Composite Electrode and Design of Optimal Binder for Lithium Secondary Battery

Department of Energy Science and Engineering Theses Ph.D.

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Analysis of Microstructure of Composite Electrode and Design of Optimal Binder for Lithium Secondary Battery

Title: Analysis of Microstructure of Composite Electrode and Design of Optimal Binder for Lithium Secondary Battery

Alternative Title: 리튬이차전지용 복합전극 미세구조 분석 및 최적 바인더 설계

Author(s): Seoungwoo Byun

DGIST Authors: Seoungwoo Byun ; Yong Min Lee ; Jong-Won Lee

Advisor: 이용민

Co-Advisor(s): Jong-Won Lee

Issued Date: 2022

Awarded Date: 2022/02

Type: Thesis

Subject: 복합 전극, Composite electrode, 고분자 바인더, Polymeric binder, 접착력, Adhesion, SAICAS

Description: 복합 전극, Composite electrode, 고분자 바인더, Polymeric binder, 접착력, Adhesion, SAICAS

Table Of Contents: Ⅰ. Introduction 1
1.1 Roadmap on EV mileage & cell design 1
1.2 The importance of binders from a microstructure point of view 2
1.3 In-depth analysis of binders in electrodes: limitations and improvements 4
1.4 Reference 6
Ⅱ. Effects of binder entanglement and crystallinity on the adhesion 7
2.1 Introduction 7
2.2 Experiment 8
2.2.1 Polymeric binder solution preparation 8
2.2.2 Polymer properties measurement 8
2.2.3 Electrode preparation 9
2.2.4 Electrical resistance measurement 9
2.2.5 Adhesion measurement 9
2.2.6 Cell assembly 10
2.2.7 Cycle test 10
2.2.8 Morphological and compositional analysis 10
2.3 Results and discussion 10
2.4 Conclusion 20
2.5 References 22
Ⅲ. Effects of binder swelling due to liquid electrolyte impregnation on the adhesion 25
3.1 Introduction 25
3.2 Experiment 26
3.2.1 Electrode preparation 26
3.2.2 Polymer film preparation 26
3.2.3 Annealing 27
3.2.4 Crystalline phase characterization 27
3.2.5 Adhesion measurement 27
3.2.6 Electrical resistance measurement 29
3.2.7 Electrochemical test 29
3.2.8 Morphological analysis 29
3.3 Results and discussion 30
3.4 Conclusion 51
3.5 References 52
Ⅳ. Binder for fast chargeable electrode for lithium-ion battery 56
4.1 Introduction 56
4.2 Experiment 57
4.2.1 Materials 57
4.2.2 Preparation of alkali metal ion substituted CMC binders 57
4.2.3 Material characterizations 58
4.2.4 Electrode preparation 58
4.2.5 Molecular dynamics simulation 59
4.2.6 Formation of 3D electrode structures 60
4.2.7 Electrochemical performance prediction 60
4.2.8 Electrochemical test 62
4.3 Results and discussion 63
4.4 Conclusion 75
4.5 References 77
Ⅴ. Application: cohesion and adhesion measurement of MEA for automotive fuel cell 80
5.1 Introduction 80
5.2 Experiment 84
5.2.1 MEA preparation 84
5.2.2 Cohesive/adhesive measurement using SAICAS 85
5.2.3 Morphological analysis 94
5.2.4 Compositional analysis 94
5.3 Results and discussion 94
5.4 Conclusion 102
5.5 References 104