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研究生:張晏銘
研究生(外文):Yan-Ming Zhang
論文名稱:鋰離子電池負極Sn/C複合材料之製備
論文名稱(外文):Preparation of Sn/C composite anode materials for lithium ion batteries
指導教授:吳溪煌
指導教授(外文):She-huang Wu
學位類別:碩士
校院名稱:大同大學
系所名稱:材料工程學系(所)
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:英文
論文頁數:128
中文關鍵詞:天然石墨酸洗NaBH4
外文關鍵詞:natural graphiteacid-washingNaBH4Sn
相關次數:
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披覆無次序碳的天然石墨與SnCl4是在水溶液裡藉由NaBH4 還原法製備Sn/C 複合材料。以XRD及Raman分析酸洗對已披覆無次序碳天然石墨表面的不完美結構及表面官能基的影響。以XRD,TGA及SEM分析Sn在天然石墨上之沉積相及沉積量,以循環充放電測試探討天然石墨在酸洗前後及沉積Sn後之電化學特性。結果顯示藉由Sn4+ 能與披覆無次序碳的天然石墨表面含氧官能基反應並且再添加
入1,10-phenanthroline 後,於已披覆無次序碳的天然石墨上能成功地沉積奈米Sn粒子。且隨著Sn4+/NaBH4莫爾比增加,Sn沉積的量愈多。在循環特性上,Sn4+/NaBH4 莫爾比為1/32時的效果較其餘的好。
Sn/C composites were prepared via a NaBH4 reduction method with carbon-coated natural graphite and SnCl4 in aqueous solution. Effects of acid washing on the disorder ness and the surface function groups on the surface of carbon-coated natural graphite surface were studied with XRD and Raman spectroscopy. The physical properties of the prepared Sn/C composites were investigated with XRD, TGA and SEM. The electrochemical properties of the prepared samples before and after Sn deposition were estimated with capacity retention study. The results demonstrated that nano-Sn particle deposited on carbon-coated natural graphite can be prepared successfully by having Sn4+ react with hydroxy group on the surface of carbon-coated natural graphite before adding 1,10-phenanthroline. The amount of Sn deposition increases with increasing ratio of Sn4+/NaBH4 addition. The sample prepared with Sn4+/NaBH4 molar ratio of 1/32 shows the most promising cycling performance among the prepared samples.
摘要 V
ABSTRACT VI
CONTENTS VII
LIST OF TABLES XI
LIST OF FIGURES XII
CHAPTER 1 INTRODUCTION 1
CHAPTER 2LITERATURE REVIEW 3
2-1 Introduction of lithium ion batteries 3
2-2 The historical development of lithium-ion batteries 4
2-3 Principle of the lithium ion battery 7
2-4 Electrode materials for lithium ion batteries 9
2-4-1 Cathode materials for lithium ion batteries 10
2-4-2 Anode materials for lithium ion batteries 11
2-4-3 Carbon materials as anodes in lithium-ion
batteries 13
2-4-3-1 Structure of carbon materials 13
2-4-3-2 Natural graphite 20
2-4-3-3 Lithium intercalation properties of
carbon materials 21
2-4-3-4 Lithium-alloys and intermetallic alloys as
anode materials for lithium-ion batteries 25
2-4-3-5 Tin oxide and its composite anode
materials 32
2-4-3-6 Nano-Sn/C composite as anode materials 35
2-5 Electrolyte for lithium-ion batteries 35
CHAPTER 3 EXPERIMENTAL 40
3-1 Powder Characterization 40
3-1-1 Acid-Washing 40
3-1-2 Sn/C Composite Prepared with method one 40
3-1-3 Sn/C Composite Prepared with method two 41 3-2 Powder Characterzation 42
3-2-1 X-ray analysis 42
3-2-2 Thermal analysis 43
3-2-3 Fourier Transform Infrared Spectroscopy
Study 43
3-2-4 Raman scattering spectrometer 44
3-2-5 Scanning Electron Microscopy (SEM)
Observation 45
3-2-6 Energy Dispersive Spectrometer (EDS)
Analysis 45
3-3 Assembling Electrochemical Cells 45
3-3-1 Preparation of the anode electrodes 45
3-3-2 Assembly of the Coin-type cell 46
3-4 Electrochemical Analysis 47
3-4-1 Capacity retention studies 47
CHAPTER RESULTS AND DISCUSSIONS 49
4-1 Characterization of the Carbon-Coated Natural
Graphite after acid-washing and double acid-washing 49
4-1-1 X-ray diffraction (XRD) 49
4-1-2 Raman and Fourier transformed spectrometer 52
4-1-3 Field-emission scanning electron microscope
(FE-SEM) 56
4-4-4 Cyclnig performance of carbon-coated natural
graphite before and after acid-washing 58
4-2 Characterization of Sn/C composites obtained with
method one 61
4-2-1 X-ray diffraction (XRD) 61
4-2-2 DTA/TGA measurements 61
4-2-3 Field-emission scanning electron microscope
(FE-SEM) 70
4-2-4 Cycling performance of Sn/C composites prepared
electrodes with method one 73
4-3 Characterization of Sn/C composites obtained with
method two 75
4-3-1 X-ray diffraction (XRD) 75
4-3-2 DTA/TGA measurements 78
4-3-3 Field-emission scanning electron microscope
(FE-SEM) 91
4-3-4 Cycling performance of Sn/C composites prepared
electrodes with method two 94
CHAPTER 5 CONCLUSIONS 99
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