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Surface Modified Silicon Electrode for Li-ion Batteries
표면 개질된 리튬 이차전지용 실리콘 전극

DC Field Value Language
dc.contributor.advisorHun-Joon Sohn-
dc.contributor.authorYoon Hwa-
dc.date.accessioned2017-07-13T05:36:34Z-
dc.date.available2017-07-13T05:36:34Z-
dc.date.issued2013-02-
dc.identifier.other000000008200-
dc.identifier.urihttps://hdl.handle.net/10371/117888-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 재료공학부, 2013. 2. 손헌준.-
dc.description.abstractNowadays, energy storage and retrieve system are important issues to solve energy problems. There are many energy storage systems such as Pb-acid, Ni-Cd, Li-S and Li-ion batteries. Among them, Li-ion battery is one of the most viable candidates for energy storage due to its high energy and high power density. At present, conventional Li-ion batteries employ a carbonaceous material for anode material. But, it is not suitable for the new large unit applications due to due to its low specific capacity and poor rate capability. For this reason, it is necessary to develop advance anode materials for Li-ion batteries.
To overcome the limitations of carbonaceous materials, many researchers are paying attention to find other candidates replacing the graphite. Most of all, Si based systems are definitely attractive candidate for replacing the carbonaceous electrode due to the large theoretical specific capacity at room temperature (Li15Si4 : 3600 mAh g-1) and low operating voltage (near 0.1 V vs. Li/Li+). However, in general, most Si based electrodes suffer from a large volume change during cycling and have a poor rate capability. The stress induced by a large volume change during the cycling cause pulverization of Si which leads to loss of electrical contact with current collector and formation of solid electrolyte interphase (SEI) layer on the electrode surface repetitively.
In this work, conducting carbon and SnO2 were coated on Si nanoparticles for enhance the electrochemical properties of Si electrode, respectively. Conformal conducting carbon is one of the most famous coating material for enhance the electrochemical properties of electrode, and SnO2 is a one of the promising candidate as anode materials for Li-ion batteries due to its excellent electrochemical performance. By combining those materials with Si, respectively, Si based electrode can be utilized fully in the anodes of Li-ion batteries. As a result of electrochemical test, each electrodes showed excellent electrochemical behaviors. And also reaction mechanism of each electrodes was confirmed by various analyses. These core-shell nanostructured electrodes could be a strong candidate as an anode materials for Li-ion batteries.
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dc.description.tableofcontentsAbstract i
Contents iv
List of Figures vi
List of Tables x
Chapter 1. Introduction 1
Chapter 2. Theoretical Background 6
2.1 Fundamental of Rechargeable Li-ion Batteries 6
2.1.1 History 6
2.1.2 Principle 8
2.1.3 Terminology 8
2.2 Components of Rechargeable Li-ion Batteries 13
2.2.1 Anode 13
2.2.2 Cathode 16
2.2.3 Electrolyte 17
2.3 Silicon 18
2.4 Core-shell Nanostructured Materials 24
Chapter 3. Experimental 27
3.1 Electrode Preparation 27
3.1.1 Active Materials Preparation 27
3.1.2 Electrode and Cell Assembly 28
3.2 Electrochemical Test 30
3.2.1 Galvanostatic Test 30
3.2.2 Differential Capacity Plot (DCP) 31
3.3 Material Characterization 31
3.3.1 X-ray Diffraction (XRD) 31
3.3.2 Scanning Electron Microscope (SEM) 33
3.3.3 Transmission Electron Microscope (TEM) 34
Chapter 4. Results and Discussion 39
4.1 nano-Si/C Core-shell Material 39
4.1.1 Material Characterization 39
4.1.2 Electrochemical Characterization 40
4.2 nano-Si/SnO2 Core-shell Material 58
4.2.1 Material Characterization 58
4.2.2 Electrochemical Characterization 58
Chapter 5. Conclusions 78
References 82
Abstract (Korean) 95
감사의 글 (Korean) 97
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dc.formatapplication/pdf-
dc.format.extent3021368 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectLi-ion batteries-
dc.subjectAnode materials-
dc.subjectSilicon-
dc.subjectCore-shell structure-
dc.subjectElectrochemistry-
dc.subjectSnO2-
dc.subjectCarbon-
dc.subject.ddc620-
dc.titleSurface Modified Silicon Electrode for Li-ion Batteries-
dc.title.alternative표면 개질된 리튬 이차전지용 실리콘 전극-
dc.typeThesis-
dc.contributor.AlternativeAuthor화 윤-
dc.description.degreeDoctor-
dc.citation.pages99-
dc.contributor.affiliation공과대학 재료공학부-
dc.date.awarded2013-02-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Materials Science and Engineering (재료공학부)Theses (Ph.D. / Sc.D._재료공학부)
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