臺灣博碩士論文加值系統

具電容行為的電解質(MPPy TFSI, 1M MPPy TFSI/PC 1.5M MPPy TFSI/PC, 和1M Et4NBF4/PC)配合不同的碳電極(aMP, aCF, tMC) 製做電容器，且進行循環伏安法、定電流充放電、交流阻抗分析等測試。電化學測試中，放電速率會影響電容行為。在高放電速率下，電容行為深受電解質的特性影響，如電解質的黏度和導電度，這兩個特性的影響能在交流阻抗分析中的高頻區觀察到。使用1.5M MPPy TFSI/PC電解質的電容器在高放電速率下具優秀的電容行為。電容器將使用MPPy TFSI/PC和1M Et4NBF4/PC，工作電壓分別為4V和3V下進行10000圈的定電流循環充放電測試，並於測試後用FTIR觀察碳電極變化。當使用MPPy TFSI/PC時，aMP的電容保持率高，而tMC因離子受困而只在7000圈保持穩定，在FTIR曲線中發現穿透率提高。aCF的FTIR曲線中能看出，經過電流循環充放電測試後，碳電極被還原，故電容值保持率低。當使用1M Et4NBF4/PC時，從FTIR曲線中看出較少離子受困和碳電極被還原的程度相對輕微，故具較高的電容值保持率。而aMP的電容值保持率差，因離子受困於正極。

The capacitive behavior of liquid based electrolyte (MPPy TFSI, 1M MPPy TFSI/PC 1.5M MPPy TFSI/PC, and 1M Et4NBF4/PC) in different carbon materials (aMP, aCF, tMC) was analyzed using cyclic voltammogram, galvanostatic charge discharge, and electrochemical impedance spectroscopy. The rate adjusted during the electrochemical measurement influence the capacitance behavior. At high sweep rate or current rate, the capacitive behavior is much influenced by the electrolyte properties such as viscosity and conductivity which is represented by EIS plot at high frequency region. 1.5M MPPy TFSI/PC shows the most capacitive behavior at high rate. The carbon materials were also analyzed using FTIR after cycling test using MPPy TFSI at 4V and 1M Et4NBF4/PC at 3V for 10000 cycles. When using MPPy TFSI at 4V, aMP has high retention. The tMC carbon was only stable until 7000 cycle due to ion trapping which can be seen from the increasing % transmittance in FTIR curve. The FTIR curve of aCF shows that the carbon reducted during cycling test thus aCF has less retention. When applying 1M Et4NBF4/PC at 3V as the electrolyte, aCF has the highest retention due to less ion trapping and no reduction on the carbon which can be seen from FTIR curve. aMP has the worst retention due to worse ion trapping on the positive electrode.

CHINESE ABSTRACT I
EXTENDED ABSTRACT II
ACKNOWLEDGEMENT VI
TABLE OF CONTENTS VII
LIST OF FIGURES IX
LIST OF TABLES XI
SYMBOLS XII
CHAPTER 1 1
1.1 Energy storage devices 1
1.2 Motive of Study and Scope 4
CHAPTER 2 6
2.1 Construction of supercapacitor 6
2.2 The performance of EDLC 9
2.3 Electrochemical measurement 11
2.3.1 Cyclic voltametry 12
2.3.2 Galvanostatic charge discharge 14
2.3.3 Electrochemical impedance spectroscopy 15
2.4 Carbon material 17
2.5 Surface functionalities of the carbon 19
CHAPTER 3 23
3.1. Experimental Chemicals, Equipment, and Materials 23
3.1.1. Experimental Chemicals 23
3.1.2. Experimental Equipment 24
3.2. Preparation Method 25
3.2.1. Preparation of aMP 25
3.2.2. Preparation of aCF 25
3.2.3. Preparation of tMC 26
3.3 Analysis and Characterization Method 27
3.3.1 Carbon material analysis 27
3.3.2 Supercapacitor assembly 27
3.3.3 Electrochemical measurements 28
3.3.4 Supercapacitor degradation analysis after cycling test 29
CHAPTER 4 30
4.1 Characterization of electrode material 30
4.2 Electrochemical analysis of the carbon 33
4.3 Evaluation of carbon material after cycling test using FTIR 41
CHAPTER 5 58
REFERENCES 59

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