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Surface Modification of LiNi0.5Mn1.5O4 with PEDOT Conducting Polymer via Emulsion Polymerization for the improvement in the electrochemical performance of Lithium-ion Batteries

에멀션 중합 반응을 이용한 리튬 이차전지용 고전압 LiNi0.5Mn1.5O4 양극소재 표면의 전도성 고분자 PEDOT 코팅 및 이를 통한 전기화학적 성능 개선

  • 권용욱 (Kwon, Yong Uk, 대학원 신소재공학과 신소재공학전공)

초록/요약

The surface of 5V class spinel LiNi0.5Mn1.5O4 was modified with poly(3,4-ethylenedioxythiophene) (PEDOT) conducting polymer by utilizing the hydrophobic characteristics of the 3,4-ethylenedioxythiophene (EDOT) monomer and the tail group of cetyl trimethyl ammonium bromide (CTAB) surfactants, in addition to the electrostatic attraction between cationic CTAB surfactant and cathode materials with a negative zeta potential in aqueous solution. With this novel concept, we designed and prepared a uniform EDOT monomer layer on the cathode materials, and chemical polymerization of the EDOT coating layer was then carried out to achieve PEDOT-coated cathode materials via a simple one-pot preparation process. This uniform conducting polymer layer provided notable improvement in the power characteristics of electrodes, and stable electrochemical performance could be obtained especially at severe operating conditions such as the fully charged state and elevated temperatures owing to successful protection of the cathode surface from side reactions with electrolyte and suppression of Mn dissolution from the cathode material.

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목차

AbstractⅠ
List of Figures Ⅱ
List of Tables Ⅲ
Chapter Ⅰ. Introduction 1
1.1 Lithium ion batteries 1
1.2 Cathode Materials 4
1.3 5V Spinel Cathode 7
1.4 Surface Modification 10
Chapter Ⅱ. Experimental 13
2.1 Materials Synthesis 13
2.2 Structural and Morphological Characterization 13
2.3 Electrochemical Characterization 14
2.4 Post-Mortem analysis 15
Chapter Ⅲ. Results and Discussion 16
3.1 Structural and Morphological Characterization 16
3.2 Electrochemical performance 36
3.3 Post-mortem analysis 53
Chapter Ⅳ. Conclusion 59
Reference 60

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