Synthesis, electrochemical and structural characterization of vanadium-based oxides as new battery electrode materials
- Title
- Synthesis, electrochemical and structural characterization of vanadium-based oxides as new battery electrode materials
- Author(s)
- Jooeun Hyoung
- DGIST Authors
- Hong, Seung-Tae ; Hyoung, Jooeun ; Kim, Jae Hyun
- Advisor
- 홍승태
- Co-Advisor(s)
- Jae Hyun Kim
- Issued Date
- 2019
- Awarded Date
- 2019-08
- Type
- Thesis
- Description
- Vanadium oxides, Lithium battery, Potassium-ion battery, Calcium-ion battery, Crystallography, Structural determination, Powder X-ray diffraction
- Table Of Contents
-
Abstract i
List of contents iv
List of tables ix
List of figures xi
Ⅰ. INTRODUCTION 1
Ⅱ. THEORY
2.1 Electrochemistry 14
2.1.1 Electromotive Force 14
2.1.2 Electrode potential 15
2.1.3 Energy storage 16
2.1.4 Types of battery 17
2.1.5 Components of battery 17
2.1.6 Various electrochemical measurement techniques 18
2.1.6.1 Cyclic voltammetry 19
2.1.6.2 Chronopotentiometry 19
2.1.6.3 Distribution of intercalation and adsorption in working electrode 20
2.1.6.4 GITT and Diffusion coefficients 23
2.2 Crystal Structure Determination from Powder XRD 25
2.2.1 Ab initio Structure Determination via Powder XRD data 26
2.3 References 32
Ⅲ. V4O9 as new high-performance Lithium Battery Cathode
3.1 Introduction 35
3.2 Experimental 36
3.2.1 Materials Synthesis 36
3.2.2 Materials Characterization 37
3.2.3 Structural characterization 37
3.2.4 Electrochemical Characterization 38
3.3 Results and discussion 39
3.3.1 Structure and Morphology of micron & submicron sized V4O9 39
3.3.2 Modified electrolyte 39
3.3.3 Electrochemical performance 40
3.3.4 Vanadium dissolution associated with electrolyte 42
3.3.5 Working mechanism 42
3.4 Conclusions 43
3.5 References 66
Ⅳ. Electrochemical Exchange Reaction Mechanism and Role of Additive Water to Stabilize Structure of VOPO4·2H2O as a Cathode Material for Potassium-Ion Batteries
4.1 Introduction 70
4.2 Experimental 72
4.2.1 Synthesis 72
4.2.2 Material Characterization 72
4.2.3 Electrochemical Characterization 72
4.2.4 Operando XRD measurement 73
4.3 Results and discussion 73
4.3.1 Structural vs crystal water of VOPO4·2H2O 73
4.3.2 Characterization of VOPO4·2H2O 74
4.3.3 Two contrasting (anhydrous vs. wet organic) electrolytes 74
4.3.4 Activated carbon as the counter electrode 74
4.3.5 VOPO4·2H2O in the anhydrous electrolyte 75
4.3.6 VOPO4·2H2O in the wet electrolyte 77
4.3.7 X-ray Photoelectron Spectroscopic Analysis 78
4.3.8 Remarks on unanswered questions 78
4.4 Conclusions 79
4.5 References 98
Ⅴ. Activation of calcium intercalation by silver extraction in silver vanadium bronze for calcium-ion batteries
5.1 Introduction 102
5.2 Experimental 103
5.2.1 Synthesis of silver vanadium bronze, β-Ag0.33V2O5 103
5.2.2 Materials Characterization 104
5.2.3 Electrochemical Characterization 104
5.2.4 In-situ XRD measurement 105
5.2.5 Bond Valence Sum Maps 105
5.2.6 Galvanostatic intermittent titration technique and Diffusion coefficients 105
5.3 Results and discussion 106
5.3.1 Characterization of β-Ag0.33V2O5 106
5.3.2 Electrochemical properties 106
5.3.3 Structural evolution and calcium-ion intercalation 107
5.3.4 X-ray Photoelectron Spectroscopic Analysis 108
5.4 Conclusions 108
5.5 References 124
Ⅵ. Side works: Crystal structure of calcium perchlorate anhydrate, Ca(ClO4)2, from X-ray powder diffraction data
6.1 Chemical context 127
6.2 Structural commentary 127
6.3 Synthesis and crystallization 128
6.4 Refinement 128
6.5 References 136
Ⅶ. Side works: Crystal structure of strontium perchlorate anhydrate, Sr(ClO4)2, from laboratory powder X-ray diffraction data
7.1 Chemical context 137
7.2 Structural commentary 137
7.3 Synthesis and crystallization 138
7.4 Refinement 138
7.5 References 146
Summary (in Korean) 148
- URI
-
http://dgist.dcollection.net/common/orgView/200000217442
http://hdl.handle.net/20.500.11750/10474
- Degree
- Doctor
- Department
- Department of Energy Science and Engineering
- Publisher
- DGIST
- Related Researcher
-
-
Hong, Seung-Tae
- Research Interests Magnesium; calcium; and zinc ion batteries; lithium all-solid-state batteries; Inorganic materials discovery; Solid state chemistry; Crystallography; Mg; Ca; Zn 이온 이차전지; 리튬 전고체전지; 신 무기재료 합성; 고체화학; 결정화학
-
- Files in This Item:
-
There are no files associated with this item.
- Appears in Collections:
- Department of Energy Science and Engineering Theses Ph.D.
Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.