A study on Synthesis and Electrochemical Property of Nano-sized Lithium Manganese Oxide Deposited on Carbon nanotubes

다국어 초록 (Multilingual Abstract)

Electrochemical energy storage system offer an enormous potential for meeting future energy demands, such as renewable energy, electric vehicles, uninterruptible power supplies and portable electronic devices. These applications require both high specific energy and high specific power. Lithium ion batteries and electrochemical capacitors are among the leading electrochemical energy storage systems. Electrical energy can be stored either by a chemical or physical mechanism on the interface between electrolyte and electrode materials. In general, considering their operating principle, lithium ion batteries have a high specific energy but low specific power. Thus, the current technology of electrochemical energy storage systems can not satisfy the future demand. Therefore, great efforts have been devoted to identifying alternative and inexpensive electrode materials with high specific energy and power for electrochemical energy storage systems.
This thesis reported synthesis and electrochemical properties of various lithium manganese oxide/ carbon nanotube (CNT) nanocomposite for lithium-ion batteries. The LMO nanoparticles were successfully synthesized and well dispersed on entangled carbon nanotube by microwave-hydrothermal process for electrochemical energy storage devices. LMO/CNT nanocomposite showed excellent cycleability as well as good structural electrochemical properties of nano-sized material were attributed to shorter lithium diffusion length, good dispersion and large ionic supply high electrode/electrolyte interfacial area by introducing entangle carbon nanotubes. This synthesis storage opens a new rout for the synthesis of lithium metal oxides on the entangled carbon nanotubes web in successful and efficient way.

목차 (Table of Contents)

• Contents 1
• List of Figures 3
• List of Tables 5
• I.Introduction 6
• II.Background 8
• 1.Lithium rechargeable battery 8
• 2.Cathode materials 11
• 3.Lithium Manganese oxide 16
• A.LiMn2O4 16
• B.LiMnO2 17
• C.Li2MnO3 17
• 4. Carbon nanotubes (CNT) 19
• 5. Hydrothermal reaction 23
• III.Experimental 25
• 1.Sample Preparation 25
• 2.Characteristic 26
• 3.Electrochemical test 27
• IV.Result and Discussion 28
• V. Conclusion 51
• VI.References 53
• Abstract 59