Dissertation > Excellent graduate degree dissertation topics show

Study on the Preparation and Modification of Anode Material Li4Ti5O12 for Lithium-ion Batteries

Author: MaiFaRen
Tutor: WuXianMing
School: Jishou University
Course: Applied Chemistry
Keywords: lithium-ion battery anode material Li4Ti5O12improvement solid-statemethod sol-gel method
CLC: TM912
Type: Master's thesis
Year: 2013
Downloads: 90
Quote: 0
Read: Download Dissertation

Abstract


The spinel Li4Ti5O12as a“zero strain”material has become a research highlightamong various anode materials. In order to improve the rate performance of Li4Ti5O12by modification,in this thesis, Synthesis, improvements structural characterization,surface morphology and electrochemical products of spinel Li4Ti5O12were analyzed byX-ray diffractometry, scanning electron microscopy, galvanostatic charge-discharge,electrochemical impedance spectroscopy and cyclic voltammeter testIn the first chapter, gives a brief introduction about the structure and workingmechanism of lithium-ion batteries, the current survey on the spinel Li4Ti5O12materialwas introduced and the methods of Spinel Li4Ti5O12synthesis and a improve the rateperformance of Li4Ti5O12.In the second chapter, we introduce the experimental material and methodes. Thedetailed procedure of coin cell assembling in laboratory is described, as well as thegeneral characterization methods of materials and electrochemical analysis.In the third chapter, the anode materials spinel Li4Ti5O12for lithium-ion batterywere synthesized by high temperature solid-state method and triethanolamine assistedsol-gel method. The result shows that Li4Ti5O12prepared by the two methods hadperfect spinel structure.When the chemical molar ratio of TEA and titanium was0.8,Li4Ti5O12exhibited a relatively good rate capability and cycling stability.At thecharge-discharge rate of1.0C, its discharge capacities were153.03mAh·g-1, respectively.After35cycles, its discharge capacity remained at139.94mAh·g-1and the capacityretention was91.45%.In Chapter4, in order to improve the ionic conductivity of lithium iron phosphatelithium, Li4Ti5O12/Ag was synthesized by an electroless deposition method combinedwith thermal decomposition of a mixture of AgNO3. The results showed that surfacecoating of Ag on Li4Ti5O12particle improved its electronic conductivity and thereforeenhanced the performance of the circulation. The discharge capacity of the compositewere137.2mAh·g-1at0.3C rate after35cycles, and the corresponding capacityretention were88.3%, respectively. EIS test proved that surface coating of Ag onLi4Ti5O12particle could decrease its charge transfer resistance greatly. In Chapter5, a new composite material Li4Ti5O12/Li1.3Al0.3Ti1.7(PO43was wassynthesized by sol-gel method to enhance the low electronic and ironic conductivity,take advantage of the higher ionic conductivity and lower activation energy ofLi1.3Al0.3Ti1.7(PO43and the unique advantages of Li4Ti5O12. The results show that thesynthesized material is pure spinel phase. The doping with Li1.3Al0.3Ti1.7(PO43couldincrease the conductivity of the synthesized anode material, decrease Li+diffusionresistance, and dramatically increase the electrochemical performance. The optimaldoping amount in a mass of ratio was3%The Li4Ti5O12/Li1.3Al0.3Ti1.7(PO43sample hada low charge transfer resistance (159.7), The initial discharge specific capacity is186mAh·g-1at0.1C,158mAh·g-1at1C, showing that it has good cycling behavior.

Related Dissertations

  1. Study on the Synthesis Bi3.25La0.75Ti3O12(BLT) Nanotubes and Nano Wires,TB383.1
  2. Study of Tin Alloy Carbon Composite Used for Lithium Ion Battery,TM912.9
  3. Preparation and Properties of Silicon Carbon Anode for Lithium Ion Battery,TM912.9
  4. Lithium anode material calcined alumina crucible Development,TQ174.6
  5. Cobalt Ferrite and Its Performance,O611.4
  6. Preparation and Photocatalytic Properties of Rare Earth Doped TiO2 and ZnWO4 with Different Morphologies,O643.36
  7. Synthesis and Characterization of Low-dimensional Nickel Borate/ Lanthanum Borate Nano Materials,TB383.1
  8. Preparation of Silicon-based Alloy Anode Material Andelectrochemical Properties,TM912
  9. The Preparation, Microstructure and Propertities of the New Type 3D-Meshy SiC/Cu-Fe Composite Material,TB33
  10. Research of Graphitized Needle Coke Coated by Phenolic Resin Pyrolytic Carbon as Anode Material for Lithium Ion Battery,TM912
  11. Preparation and Modification of Lithium Ion Battery LiNi0.8Co0.05O2 Cathode,TM912
  12. The Research on Preparation Technology and Sintering Behavior of Rare Earth Aluminates (Dy3Al5O12、 NdAlO3、LaAl11O18),TB383.3
  13. Studies of High Refractive Index Materials Prepared by Nano ZrO2 and TiO2 Hybrid Silicone Epoxy Resin,TB383.1
  14. Preparation and Characterization of Al2O3/C Hybrid Aerogels and Al2O3 Aerogels,O648.17
  15. Effect of Water Binder on the Electrochemical Performance of Graphite,TM912
  16. Preparation and Performance Research of Lithium Ion Battery Anode Material Li4Ti5O12,TM912
  17. Synthesis and Properties of Spinel Limn2 O4 as Cathode Material,TM912
  18. Quasi-one-dimensional Spin System Ca3 (Co, T)2O6 (T = Fe, Mn) : Preparation, Structure and Magnetic Properties,O488
  19. Electroless Silver Plating on the Polyester Fibers and Polyamide Fibers Modified by 3-Mercartopropyltriethoxysilane,TQ342.2
  20. Study on the Photoelectrocatalytic Degradation of Nitrogen-containing Organic Pollutants with ZnO Thin-films Prepared by Sol-gel Method,X703
  21. Study lithium titanate prepared from ilmenite,TM912

CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
© 2012 www.DissertationTopic.Net  Mobile