The Role of Functional Electrolytes for Superior Power Performance in Li-ion Batteries and Electrolyte Additive for Enhanced Thermal Stability of Na-ion Batteries
The Role of Functional Electrolytes for Superior Power Performance in Li-ion Batteries and Electrolyte Additive for Enhanced Thermal Stability of Na-ion Batteries
Dong-Hui Kim. (2019). The Role of Functional Electrolytes for Superior Power Performance in Li-ion Batteries and Electrolyte Additive for Enhanced Thermal Stability of Na-ion Batteries. doi: 10.22683/thesis.200000171504
Type
Thesis
Table Of Contents
List of Contents
Abstract i List of contents iii List of tables vi List of figures vii Ⅰ. INTRODUCTION 1 Ⅱ. THEORY 2.1 Electrochemistry 7 2.1.1 Electromotive Force 7 2.1.2 Electrode Potential 7 2.1.3 Energy Storage 8 2.2 Battery Theory 9 2.3 Lithium-ion Batteries (LIBs) 10 2.3.1 Anode Materials 11 2.3.2 Electrolytes 12 2.3.3 Solid Electrolyte Interphase (SEI) 13 2.3.4 Additives 14 2.3.5 Cathode Materials 14 2.4 References 15 Ⅲ. Unexpected superior power performance of a gel-polymer electrolyte for Li-ion batteries triggered by unique solvation-structure 3.1 Introduction 16 3.2 Experimental 19 3.2.1 Chemicals and gelation 19 3.2.2 Battery performance and safety tests 19 3.2.3 Electrochemical and spectroscopic analysis 20 3.3 Results and discussion 22 3.3.1 Gelation, electrochemical characteristics and enhanced safety of A-GPE 22 3.3.2 Superior rate capability of A-GPE cells 31 3.3.3 Solvation structure of Li-ions in A-GPE 39 3.3.4 Long-term stability and compatibility with various active materials 51 3.4 Conclusions 54 3.5 References 55 Ⅲ. Importance of the internal resistance at different electrode thickness for high performance Li-ion batteries 4.1 Introduction 62 4.2 Experimental 63 4.2.1 Chemicals and electrode preparation 63 4.2.2 Electrochemical and spectroscopic analysis 63 4.3 Results and discussion 65 4.3.1 Electrolyte properties 65 4.3.2 Rate performance of glyme co-solvent in LiCoO2 Cathode 70 4.3.3 Relation between the individual internal resistance and the rate performance 72 4.4 Conclusions 83 4.5 References 84 Ⅴ. Succinic anhydride as electrolyte additive for enhanced thermal stability of hard-carbon electrodes for Na-ion batteries 5.1 Introduction 85 5.2 Experimental 86 5.2.1 Chemicals and electrode preparation 86 5.2.2 Electrochemical measurements 87 5.2.3 X-ray photoelectron spectroscopy (XPS) 88 5.3 Results and discussion 88 5.3.1 Cycling performance of HC/Na half cells 88 5.3.2 Cycling and storage performance of HC/HC cells. 95 5.3.3 XPS study on surface composition of the SEI layer 99 5.4 Conclusions 104 5.5 References 105 Summary (in Korean) 109
