Electrochemical Evaluation of Titanium Oxide and Tin Oxide as High Power Anode Materials for Lithium-Ion Batteries
리튬 이온 전지 고출력 음극 물질로서 이산화티타늄과 이산화주석의 전기화학적 평가

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dc.description학위논문 (박사)-- 서울대학교 대학원 : 화학생물공학부, 2015. 2. 성영은.-
dc.description.abstractThe development of electric vehicles (EVs) has been stimulated with the advent of the era of clean energy, leading to the commercialization of hybrid electric vehicles (HEVs), powered by an internal combustion engine and an electric motor that utilizes energy stored in lithium-ion batteries (LIBs), and the rapid development of battery electric vehicles (BEVs) using only battery as a power source. The demand for power performance in the battery of EVs is more than 50 times higher than in the small electric devices such as cellular phones and laptop computers. The high power performance is associated with the various factors including electrode material, electrode structure, ion conductivity of electrolyte, etc. For the anode materials at present known, energy density (Watt-hours) and power density (Watt) are trade-off relation, which expedites the following researches for the realization of high power performance from high energy density materials: (1) new material development (2) electrode filming (3) design of integrated electrode (4) understanding of reaction mechanism and design for new electrode material using ab initio quantum chemistry methods. In this dissertation, high power density through the material design and the integrated electrode architecture utilizing the character of thin film electrode potentially will be discussed.
Chapter 1 begins with general overview of LIBs and materials of cathode and anode categorized according to structure and reaction mechanism, respectively. In addition, titanium oxide known as a typical anode material with high rate capability and tin oxide having a high theoretical capacity in anode materials are introduced.
Chapter 2 describes the electrochemical properties of titanium oxide. In particular, the effect of particle size controlled with three different size groups on the power density is discussed. The structural changes upon cycling were analyzed by in-situ synchrotron X-ray diffraction. The increase of capacity upon cycling like activation was observed in all size groups, which is rarely reported in the stable anode material following intercalation reaction mechanism. As a reason for this phenomena, I propose the enhancement of contact area between active material and electrolyte resulted from lattice expansion upon cycling through in-situ synchrotron X-ray diffraction analysis.
Chapter 3 introduces an approach to improve the electrochemical performance of tin oxide. Compared with conventional LIBs electrode in 2-dimensional (2D) laminate structure, electrode design was extended into 3-dimensional (3D) architecture of copper foam applied to template for the deposition of tin oxide. The copper foam, served as a current collector and a template for forming a thin layer of tin oxide, is advantageous for alleviating the large volume changes of tin oxide during cycling by providing void space. The integrated electrode is free of binder and conducting agent, exhibiting a high reversible capacity, good rate capability, and stable cycle retention with maintaining a structural integrity. As another electrode architecture, copper layer-by-layer assembly is introduced. Many pores are developed on the surface of each layer, penetrating the layer and creating an open pore system. Consequently, the copper layer-by-layer assembly with high surface area realizes excellent power performance even at very high current densities from tin oxide of high capacity anode material.
dc.description.tableofcontentsAbstract i
Contents iv
List of Tables vii
List of Figures viii

Chapter 1. Introduction 1
1.1. Lithium-ion batteries 1
1.1.1. General introduction 1
1.1.2. Titanium oxide 12
1.1.3. Tin oxide 14
1.2. References 17

Chapter 2. Titanium oxide 21
2.1. Particles size effect of titanium oxide 21
2.1.1. Introduction 21
2.1.2. Experimental section 24 Materials synthesis 24 Electrochemical measurements 25 Characterization 25
2.1.3. Results and discussion 27 Preparation of size-controlled TiO¬2 27 Electrochemical performance 34
2.1.4. Conclusions 49
2.2. References 50

Chapter 3. Tin oxide 54
3.1. Tin oxide coated three-dimensional copper foam 54
3.1.1. Introduction 54
3.1.2. Experimental section 56 Materials synthesis 56 Electrochemical measurements 56 Characterization 57
3.1.3. Results and discussion 58 Preparation of SnO2-coated Cu foam 58 Electrochemical performance 61
3.1.4. Conclusions 72
3.2. References 73
3.3. Tin oxide deposited copper layer-by-layer assembly 77
3.3.1. Introduction 77
3.3.2. Experimental section 80 Synthesis of Cu scaffold via freeze-casting 80 Deposition of SnO2 through a sol-gel process 82 Electrochemical measurements 84 Characterization 85
3.3.3. Results and discussion 86 Materials and structure design 86 Preparation of SnO2-coated Cu scaffold electrode 87 Electrochemical performance 98
3.3.4. Conclusions 112
3.4. References 113

국문초록 (Abstract in Korean) 122
dc.format.extent4924032 bytes-
dc.publisher서울대학교 대학원-
dc.subjectLithium-ion battery-
dc.subjectElectrode architecture-
dc.subjectHigh power density-
dc.subjectTitanium oxide-
dc.subjectTin oxide-
dc.titleElectrochemical Evaluation of Titanium Oxide and Tin Oxide as High Power Anode Materials for Lithium-Ion Batteries-
dc.title.alternative리튬 이온 전지 고출력 음극 물질로서 이산화티타늄과 이산화주석의 전기화학적 평가-
dc.contributor.affiliation공과대학 화학생물공학부-
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Theses (Ph.D. / Sc.D._화학생물공학부)
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