臺灣博碩士論文加值系統

近年來，由於鋰離子電池具有高電容量、高工作電壓、長圈數充放電性能的特性，對於其的需求與日俱增。除了在攜帶式電子裝置的需求之外，未來在電動車市場的需求以及和智慧電網相互搭配所需的儲能裝置上，皆須大量運用到鋰離子電池。鋰鎳錳氧材料因具有高穩定性、高功率密度的優勢，極具有取代傳統所使用的正極材料鋰鈷氧之潛力，成為下個世代的正極材料。
本研究致力於水系黏結劑極片製程之開發，採用如羧甲基纖維素鈉(CMC)和海藻酸鈉(SA)等黏結劑，與傳統常用之有機系製程採用聚偏氟乙烯(PVDF)和有機溶劑N-甲基吡咯烷酮(NMP)進行比較。水系黏結劑製程之開發由於以水取代有機溶劑NMP，具有降低成本和對環境友善之優勢，符合鋰離子電池工業之需求。在本研究中，藉由水系黏結劑取代有機系黏結劑(PVDF)，與鋰鎳錳氧正極材料結合，進行極片製備。對於正極材料電化學性質有正面改進之效果，特別是在快速充放電性能及高溫長圈數性能上，有顯著之提升。經由一系列的極片測試與電化學分析，觀察到水系黏結劑相對於傳統上有機系黏結劑(PVDF)具有分散性較佳之優勢，期能建立一套有助於鋰離子傳輸及抑制過渡金屬溶出現象的運作框架。

List of Tables III
Figure Captions IV
Abstract IX
Chapter 1 Introduction 1
1.1 Background 1
1.2 Introduction to lithium-ion battery 3
1.3 Motivations and objectives in this study 6
Chapter 2 Literature Review 13
2.1 The evolution of cathode materials 13
2.2 Spinel LiNi0.5Mn1.5O4 cathode materials 19
2.3 Binder materials for lithium-ion battery 23
2.3.1 Basic concepts of binder materials 23
2.3.2 Anode materials 25
2.3.3 Cathode materials 28
Chapter 3 Experimental Details 41
3.1 Material preparation 41
3.1.1 Synthesis procedure of spinel LiNi0.5Mn1.5O4 powder 41
3.1.2 Binder source 41
3.2 Characterization and analysis 42
3.2.1 Phase identification 42
3.2.2 Morphological observation 42
3.2.3 Structural investigation 42
3.2.4 Storage test 43
3.2.5 Bond structure investigation 43
3.3 Electrochemical measurements 44
3.3.1 Electrode fabrication and battery assembly 44
3.3.2 Cyclability and rate capability measurement 45
3.3.3 Cyclic voltammetry (CV) 45
3.3.4 Electrochemical impedance spectroscopy (EIS) 45
Chapter 4 Results and Discussion 48
4.1 Effect of different binders on LiNi0.5Mn1.5O4 with enhanced rate capability 48
4.1.1 Synthesis of LiNi0.5Mn1.5O4 cathode material by co-precipitation method 49
4.1.2 Electrochemical analysis of LiNi0.5Mn1.5O4 electrode with different binders 50
4.2 Effect of different binders on LiNi0.5Mn1.5O4 with improved cycling performance at elevated temperature 68
4.2.1 Electrochemical performance 69
4.2.2 Electrode and binder investigation 71
4.2.3 ICP and XPS analysis of LiNi0.5Mn1.5O4 electrode 75
Chapter 5 Conclusions 90
References 92

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