Preparation and Characterization of SiOx Nanoparticles by Evaporation and Condensation Process
- 주제(키워드) Li ion battery , SiOx , silicon monoxide , Induction melting
- 발행기관 고려대학교 대학원
- 지도교수 남 산
- 발행년도 2011
- 학위수여년월 2011. 2
- 학위구분 석사
- 학과 일반대학원 신소재공학과
- 원문페이지 85 p
- 실제URI http://www.dcollection.net/handler/korea/000000025191
- 본문언어 영어
- 제출원본 000045640996
초록/요약
The nanoparticles have several interesting properties which cannot be shown in their bulk materials because of their high ratio of surface area to volume. They can be used to synthesized the nanostructured materials, the industrial materials, or the catalyst materials etc.. We can prepare nanoparticles of various sizes by evaporation and condensation process and those particles can be used as raw materials for various advanced functional materials. In this research, evaporation and condensation process using segmented graphite crucible was investigated SiOx nanoparticles. And new structure of crucible was suggested for SiOx nanoparticles evaporation. Numerical and experimental studies of induction melting process of silicon using the suggested crucible were conducted. For numerical analysis, 3D models of crucible, induction coil and silicon were constructed and electromagnetic force and temperature distribution in silicon and crucible were calculated. To evaluate the process with the suggested crucible, induction melting system was built up based on the simulated results and SiOx nanoparticles preparation were carried out by evaporation and condensation process. SiOx nanoparticles was synthesized through the various process parameters. In addition, the various characterizations of the synthesized SiOx nanoparticles was studied.
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Contents
Abstract ⅰ
Figure List ⅵ
Table List ⅹ
Chapter 1. Introduction 1
Chapter 2. Literature survey 4
2-1. Principle of lithium ion battery 4
2-1-1. Components of anode in lithium-ion battery 4
2-1-1-1. Binder 4
2-1-1-2. Conducting material 5
2-1-1-3. Active material 5
2-1-1-4. Current collector 6
2-2. Parameters influencing the performance of lithium-ion
battery 7
2-2-1. Material parameters 7
2-2-1-1. Theoretical capacity 7
2-2-1-2. Practical capacity and volume expansion 8
2-2-1-3. Structure substantiality 8
2-2-2. Device fabrication parameters 9
2-2-2-1. Electrical contact 9
2-2-2-2. Adhesion to current collector 9
2-3. Si-based anode materials 10
2-4. Synthesis of nanostructured materials 15
2-4-1. Physical methods 16
2-4-2. Chemical methods 19
2-5. Characterization of SiOx nanoparticles 22
2-5-1. X-Ray diffraction (XRD) 22
2-5-2. Scanning electron microscopy (SEM) 22
2-5-3. High resolution-transmission electron microscopy (HR-TEM) 22
2-5-4. Inductively cupled plasma (ICP-OES) 22
2-5-5. X-ray photoelectron spectroscopy (XPS) 23
Chapter 3. Experimental procedure 24
3-1. Segmented graphite crucible of 3D models 24
3-1-1. Numerical theory 24
3-1-2. 3D modeling 27
3-2. Evaporation and condensation process using induction
melting system 29
3-3. Oxygen content analysis of using XPS 34
Chapter 4. Results and discussion 37
4-1. Segmented graphite crucible for silicon melting 37
4-1-1. Evaluations of the segmented graphite crucible 37
4-1-2. Temperature Distribution of a Segmented Graphite Crucible 42
4-1-3. Induction melting process of silicon 44
4-2. Microstructure analysis of synthesized SiOx nanoparticles 50
4-2-1. The microstructures of the synthesized SiOx nanoparticles with
the various gases 50
4-2-2. The microstructures of the synthesized SiOx nanoparticles with
the O2 / Ar and H2 / Ar partial pressure 52
4-2-3. Structures of the synthesized SiOx nanoparticles by the various
gas partial pressures 56
4-2-4. XPS analysis of the synthesized SiOx nanoparticles by the
various gas partial pressures 58
4-2-5. HR-TEM analysis of synthesized SiOx nanoparticles 61
4-2-6. Purity comparison of the commercial SiOx microparitcles
and synthesized SiOx nanoparticles 63
4-2-7. Specific capacity of the synthesized SiOx nanoparticles and
the commercial SiOx microparticles 65
Chapter 5. Conclusions 67
References 68
