Dissertation > Excellent graduate degree dissertation topics show

Synthesis and Research of LiFePO4/C as Cathode Material for Lithium Ion Battery

Author: ZhangGongZuo
Tutor: ChenGang
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: Lithium ion battery Cathode material LiFePO4 / C Coated Doping
CLC: TM912.4
Type: Master's thesis
Year: 2007
Downloads: 246
Quote: 0
Read: Download Dissertation

Abstract


LiFePO 4 as a new lithium ion battery cathode materials with low prices, environmentally friendly, recycling and good performance. This article was prepared by carbothermal reduction LiFePO 4 / C, focuses on the different amount of sugar added and doping Mg 2 on the prepared LiFePO 4 crystal structure and properties. By powder X-ray diffraction method (X-ray Diffraction, XRD), Fourier transform - infrared spectroscopy (Fourier Transform Infrared, FT-IR), scanning electron microscope (Scanning Electron Microscope, SEM), constant current charge and discharge, cyclic voltammetry security and other means of LiPePO 4 phase structure, morphology and electrochemical properties were analyzed. In LiNO 3 , Fe (NO 3 ) 3 · 9H 2 O, NH 4 H 2 PO 4 and C 12 H 22 O 11 for raw materials by carbothermal reduction method synthetic samples, XRD analysis showed that the synthesized samples olivine LiFePO 4 . By FT-IR and SEM analysis showed that the carbon-coated LiFePO 4 around and found that the amount of sugar added to increase the carbon-coated LiFePO 4 of volume increase, carbon-coated layer has a thickness of about 20nm. Cycle performance tests show that the amount of sugar added 63mass%, the best performance of the sample loop, 0.1C current maximum discharge capacity of 143.2mAh / g, 2C current discharge capacity of 99.8mAh / g. After doing 2C current cycle 40 times, do 0.1C current cycle performance test and found that the first discharge capacity of 137.5mAh / g, the specific capacitance of the sample has a good recovery. Sucrose addition is 63mass% of the samples were doped with Mg 2 modified, XRD analysis showed that the synthesized samples olivine-type LiFePO 4 . As doping increases, the diffraction peaks shifted to higher angles, indicating Mg 2 substituted LiFePO 4 in the part of Fe 2 . SEM detected, doping did not have an impact on the carbon coating layer. Mg doping of 0.05, that LiMg 0.05 Fe 0.95 PO 4 / C cycle performance is better. 0.1C current initial discharge capacity of 122.1mAh / g, 2C current initial discharge capacity of 88.7mAh / g. Carbothermal reduction method using synthetic samples with a simple process, low price of LiFePO 4 electrochemical performance improvement effect is obvious in the commercialization of LiFePO 4 has a good potential applications.

Related Dissertations

  1. Preparation and Properties of Silicon Carbon Anode for Lithium Ion Battery,TM912.9
  2. Characteristics of Nitrogen Release and Effect on Environment of Different Kinds of Coated Urea,TQ440.1
  3. Preparation and Properties of ZnO-based Diluted Magnetic Semiconductors,TN304.21
  4. Chemical reduction process and properties of prepared copper clad iron,TF123.12
  5. La, Ce doped iron oxide nanoparticles and surface adsorption phase transition behavior of,TB383.1
  6. Synthesis and Modification of La0.7Sr0.3MnO3 Coated LiFePO4/C Cathode Materials,TM912
  7. CaTiO_3-NdAlO_3 Preparation and microwave dielectric properties of ceramics,TQ174.6
  8. Preparation and Property of Nano-CeO2-TiO2 Composite Mesoporous Materials,O611.3
  9. Preparation and Application of Zinc Stannate Coated Inorganic Nano-Particles as Flame Retardant,TB383.1
  10. Preparation and Research on the Properties of Multiform Oxides Doped Tin Dioxide Electrodes,TB383.1
  11. Study of Field Emission Properties of Printed Carbon Nanotube Films,TB383.1
  12. Preparation and Property-research of BiFeO3 Ceramics and Thin Solid Films,O484.1
  13. Preparation and Photosensitive Properties of Mn、Co、Al-doped SiC Films,O484.1
  14. Study on the Hydrothermal Synthesis of Spinel-type Lithium Ion-sieve and Ni-Cr Doping,P579
  15. Preparation and Physical Properties of Mn and Co-doped SiC Diluted Magnetic Semiconductor Films,TN304.055
  16. New lithium -ion battery anode material Li 4 Ti 5 O 12 Preparation and Modification,TM912
  17. Graphite anode low temperature performance influencing factors and improving research,TM912
  18. Titanium-based metal oxide coating preparation and application of the electrodes,X703
  19. Nano-crystalline TiO 2 Fiber 's Preparation of and Its Photocatalytic water purification research,O643.32
  20. Typical odor substances in raw water Photocatalytic Degradation,O643.32
  21. Sol - gel method p -type ZnO films,O484.1

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