Synthesis of Poly(3,4-ethylenedioxythiophene) (PEDOT) as a Binder for Silicon Anodes of Lithium-ion Batteries
- 주제(키워드) PEDOT , Lithium-Ion Batteries , Binder
- 발행기관 고려대학교 대학원
- 지도교수 서광석
- 발행년도 2016
- 학위수여년월 2016. 8
- 학위구분 석사
- 학과 대학원 신소재공학과
- 원문페이지 43 p
- 실제URI http://www.dcollection.net/handler/korea/000000068610
- 본문언어 영어
- 제출원본 000045953514
초록/요약
An aqueous dispersion of poly(3,4-ethylenedioxythiophene) (PEDOT) was derived with the presence of poly(acrylic acid) (PAA) as a template agent. In addition, synthesized results were used as a binder for silicon anodes of lithium-ion batteries (LIBs). Due to its own conductivity, PEDOT is able to provide the conductive path for effective electron transfer between current collectors and electrode materials. Furthermore, utilizing dispersing agent, especially iron(III) sulfate (FS), reduces the particle size of PEDOT from ~ 400 nm to ~ 50 nm. Consequently, small sized PEDOT (PEDOT-S) can be dispersed more homogeneously in electrode materials compared to large sized PEDOT (PEDOT-L). The electrode composites with PEDOT-S binder exhibit the better electrochemical performance and electrical properties compared to PEDOT-L, PAA, and CMC binder.
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CONTENT
Abstract ………………………………………………………………………………i
List of Tables ………………………………………………………………………..iv
List of Figures ………………………………………………………………………iv
1. Introduction ………………………………………………………………………1
2. Experimental ……………………………………………………………………..4
2.1. Synthesis of PEDOT ……………………………………………………………3
2.1.1. Materials ……………………………………………………………………3
2.1.2. Synthesis and purification of PEDOT …………………………………………5
2.2. Fabrication of coin cells ………………………………………………………...7
2.2.1. Materials ……………………………………………………………………7
2.2.2. Fabrication of coin cells ……………………………………………………...7
2.3. Measurement and characterization …………………………………………….8
3. Results and discussions …………………………………………………………..9
3.1. Structure characterization ……………………………………………………...9
3.1.1. SEM analysis of PEDOT and electrode composites ……………………………..9
3.1.2. FTIR analysis of synthesized PEDOT ………………………………………..13
3.1.3. UV-Vis analysis of PEDOT ………………………………………………….15
3.2. Electrochemical characterization ……………………………………………..19
3.2.1. Electrochemical cycling ……………………………………………………..19
3.2.2. Galvanostatic charge/discharge profiles ……………………………………...23
3.2.3. Electrochemical impedance spectroscopy …………………………………….25
3.2.4. Electrochemical rate capability performance …………………………………30
4. Conclusion …………………………………………………..…………………..32
Reference …………………………..…………….…………………………………33
