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研究生： 陳清平
Tran, Binh Thanh
論文名稱： 氧化石墨烯量子點為高電壓鋰離子電池之電解液添加劑
Graphene oxide quantum dots as electrolyte additive for high voltage lithium ion batteries
指導教授： 鄧熙聖
Teng, Hsisheng
學位類別： 碩士
Master
系所名稱： 工學院 - 化學工程學系
Department of Chemical Engineering
論文出版年： 2020
畢業學年度： 108
語文別： 英文
論文頁數： 60
外文關鍵詞： lequid electrolyte, lithium battery, electrochemical
相關次數： 點閱：61  下載：0 
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    • Electrolyte additive has become a crucial ingredient to improve the performance and commercialization of lithium ion batteries nowadays. Batteries with lithium metal as their anodes are considered promising energy storage devices because of their high energy density. However, safety concerns associated with dendrite growth along with limited cycle life, especially at high charge current densities, hinder their practical uses. This study proposes for a carbonate-based electrolyte solution of 1 M LiPF6 an electrolyte additive, ammonia-treated graphene oxide dots (A-GODs), which effectively immobilize PF6̄ anions to prevent their decomposition on electrodes as well as improve the mobility of Li+ cations. With an optimal amount of 0.05 wt% in the electrolyte, A-GODs substantially increase the electrochemical stability voltage and smooth the stripping and plating process on Li metal and reduce the polarization. When assembled into batteries, A-GODs promote the capacity, high-rate capability, electrochemical stability, and charge-discharge cycling life of a resulting battery that consists of a Li-metal anode and a LiNi0.5Mn0.3Co0.2O2 cathode. The capacity retention after 100 times of cycling at 1 C-rate reaches 65%, which is superior to that of a battery without using the A-GODs (57%).

    CONTENTS ABSTRACT III LIST OF FIGURES IV LIST OF TABLES VIII LIST OF ABBREVIATIONS IX ACKNOWLEDGEMENTS XI 1. MOTIVATION 1 2. INTRODUCTION: LITHIUM-ION BATTERIES 5 2.1 Working principle 5 2.2 Battery definitions 6 2.3 Electrode materials for Li-ion batteries 8 2.3.1 Cathode materials 9 2.3.2 Overview of Anode Materials 11 2.4 Separators 16 2.5 Electrolytes 17 2.5.1 Aprotic organic liquid electrolyte 17 2.5.2 Solvents 18 2.5.3 Conducting salts 20 2.6 Electrolyte additives 22 2.6.1 Anode additives 22 2.6.2 Cathode additives 26 2.6.3 Graphene oxide quantum dots 28 3. EXPERIMENTAL 32 3.1 Materials and equipment 32 3.1.1 Materials 32 3.1.2 Equipment 33 3.2 Cathode/electrolyte preparation and cell assemblage 34 3.2.1 NMC cathode preparation 34 3.2.2 Graphene Quantum Dots preparation 34 3.2.3 Electrolytes preparation 36 3.2.4 Cell assembly 37 3.3 Electrochemical analyzing method 37 3.3.1 Linear sweep voltage (LSV) and cyclic voltammetry (CV) 37 3.3.2 Electrochemical impedance spectroscopy 38 3.3.3 Conductivity determination using electrochemical impedance spectroscopy 40 3.3.4 Galvanostatic cycling 41 3.3.5 Li stripping-plating test 41 3.3.6 Zeta potential 42 4. RESULTS AND DISCUSSION 45 4.1 Electrochemical performance in half cells 45 4.2 Ionic conductive of electrolyte 46 4.3 Cycling voltammetry of half cell 47 4.4 Zeta potential of doped-additive electrolyte 48 4.5 Galvanostatic cycling in Li/SPE/LFP cells 49 4.6 Lithium stripping/plating test 52 5. CONCLUSION 53

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