Minsang Jo. (2023). Investigations on Surface Properties and Novel Electrolyte Additive Development for Lithium-Ion Battery Anodes Based on Graphite and Silicon. doi: 10.22677/THESIS.200000688104
Type
Thesis
Description
Li-ion batteries; Electrolyte additives; Graphite-silicon anodes; SEI layer; Surface properties
Table Of Contents
Ⅰ. INTRODUCTION 1 Ⅱ. THEORY 8 2.1 Electrochemistry 8 2.1.1 Electromotive Force 8 2.1.2 Electrode Potential 8 2.1.3 Energy Storage 9 2.2 Battery Theory 10 2.4 Lithium-ion Batteries (LIBs) 11 2.4.1 Anode Materials 13 2.4.2 Electrolytes 14 2.4.3 Solid Electrolyte Interphase (SEI) 15 2.4.4 Additives 15 2.4.5 Cathode Materials 16 2.5 References 17 Ⅲ. Impact of SEI Viscoelasticity on the Performance of Graphite-SiO Anodes: An EQCM Analysis 18 3.1 Introduction 18 3.2 Experimental 20 3.2.1 Materials 20 3.2.2 Electrochemical measurements 20 3.2.3 Characterization 21 3.3 Results and discussion 21 3.3.1 Cycle performance of Gr-SiO half cells with electrolyte additives 21 3.3.2 EQCM analysis 23 3.4 Conclusions 33 3.5 References 34 Ⅳ. Characterization of SEI Layer Electrical Resistance on Graphite-SiO Anode via SSRM Analysis and Leakage Current Measurement 38 4.1 Introduction 38 4.2 Experimental 40 4.2.1 Materials 40 4.2.2 Electrochemical measurements 40 4.2.3 SSRM analysis 41 4.3 Results and discussion 41 4.3.1 Leakage current measurement and electrochemical performance 41 4.3.2 EIS and SSRM analysis 47 4.4 Conclusions 56 4.5 References 57 Ⅴ. In-situ OM Analysis of SOC Inhomogeneity in Graphite Anode and the Effect of Li2SnF6 Additive on Graphite-Silicon Anode Performance 60 5.1 Introduction 60 5.2 Experimental 62 5.2.1 Materials 62 5.2.2 Preparation of electrodes 62 5.2.3 Electrochemical measurements 62 5.2.4 Characterization 64 5.3 Results and discussion 64 5.3.1 Effects of Sn-QD on Li nucleation overpotential 64 5.3.2 In-situ optical microscopy for graphite anode 70 5.3.3 Effects of Li2SnF6 additive on Gr-Si anodes 78 5.4 Conclusions 89 5.5 References 90 Summary (in Korean) 93
