High Performance Silicon-Based Lithium-Ion Batteries Using Conductive Polymer
- 주제(키워드) Lithium Ion Batteries , Conductive polymer , PEDOT
- 발행기관 고려대학교 대학원
- 지도교수 서광석
- 발행년도 2018
- 학위수여년월 2018. 2
- 학위구분 박사
- 학과 대학원 신소재공학과
- 원문페이지 75 p
- 실제URI http://www.dcollection.net/handler/korea/000000079574
- 본문언어 영어
- 제출원본 000046026384
초록/요약
To obtain the high performance silicon-based lithium-ion batteries, PEDOT:PAA was used as a binder. To optimize the resistivity and morphological properties of PEDOT:PAA, various variables such as molar weight of template, molar ratio of reactant and additional oxidant were controlled. Chemical characteristics and electrochemical properties were investigated by SEM, XPS, FT-IR and UV-Vis spectroscopy. As-synthesized PEDOT:PAA was applied to lithium-ion batteries and cycling performance and rate capability were tested. As a result, PEDOT:PAA having ~50 nm and 30 kΩ was synthesized. As-synthesized PEDOT:PAA was applied to binder for silicon-based anode. Cycle performance of various kind of PEDOT:PAA which synthesized with different conditions were compared. In addition, cycle performance and adhesion properties of PEDOT:PAA and other conventional binders such as CMC and PAA were compared. PEDOT:PAA showed better cycle performance and adhesion properties than other binders. Based on the results, PEDOT:PAA can be used as a binder for lithium-ion batteries anode.
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ABSTRACT ……………………………………………………………….. iv
List of Tables ………………………………………………………………… v
List of Figures …………………………………………………………… vii
CHAPTER 1. General Introduction ……………………………………… 1
Reference …………………………………………………………………… 3
CHAPTER 2. Synthesis of PEDOT:PAA ………………………………… 6
2.1. Introduction …………………………………………………………… 6
2.2. Experimental section ………………………………………………… 8
2.2.1. Materials …………………………………………………………… 8
2.2.2. Synthesis of PEDOT:PAA ………………………………………… 9
2.2.3. Characterization …………………………………………………… 9
2.3. Results and Discussion ……………………………………………… 12
2.3.1. Influence of molecular weight of template ……………………… 12
2.3.2. Influence of the molar ratio between monomer and template …………………………………………………………………………… 14
2.3.3. Reduction of particle size ………………………………………… 14
2.3.4. Characterization of PEDOT:PAA ………………………………… 19
2.4. Conclusions ………………………………………………………… 25
References ………………………………………………………………… 27
Chapter 3.Application of PEDOT:PAA as A Binder For Si-based Lithium-Ion Batteries ……………………………………………………………… 29
3.1. Introduction ………………………………………………………… 29
3.2. Experimental Section ………………………………………………… 30
3.2.1 Materials …………………………………………………………… 30
3.2.2 Preparation of Coin Cells …………………………………………… 31
3.2.3 Characterization …………………………………………………… 32
3.3 Results and Discussion ……………………………………………… 32
3.3.1 Comparison of conductive carbon ……………………………… 32
3.3.2 Influence of particle size of PEDOT:PAA ……………………… 33
3.3.3 Influence of resistivity of PEDOT:PAA ………………………… 38
3.3.4 Effect of oxidant contents ……………………………………… 41
3.3.5 Influence of electrolyte composition …………………………… 44
3.3.6 Comparison of PEDOT:PAA and other conventional binders …… 47
3.3.7 Morphology of electrode ………………………………………… 52
3.3.8 Adhesion properties of electrodes ……………………………… 55
3.4 Conclusions …………………………………………………………… 55
References ………………………………………………………………… 59
Chapter 4. Conclusions ………………………………………………… 61
