Dissertation > Excellent graduate degree dissertation topics show

Preparation, Characterization and Modification of the FeSe2 Nanomaterials

Author: YangShuang
Tutor: MaiLiQiang
School: Wuhan University of Technology
Course: Materials Science
Keywords: FeSe2 Nanomaterials Lithiated Composites Modified Electrochemical
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 59
Quote: 0
Read: Download Dissertation

Abstract


Chalcogenides because of its unique optical and electrical performance, especially selenium compounds has been a lot of attention has been become a research hotspot. But for FeSe2, especially FeSe2 electrochemical nature of the study is also relatively small, FeSe2 semiconductor material having a narrow band gap, a high electron conductivity, high specific capacity and other advantages thereby in nano lithium cell materials having very important significance, but further research is needed to overcome capacity fading fast FeSe2 exists, defects and poor circulation stable than this article using the hydrothermal method FeSe2 nanomaterials and electrochemical properties of TWO MODIFIED the technology FeSe2 nanomaterials modified, the main content and the results are as follows: the hydrothermal method FeSe2 nanomaterials, polyvinyl alcohol solution was prepared by introducing appropriate concentration higher crystallinity, pure phase FeSe2 of nanomaterials using XRD, FESEM its structure characterization will be obtained FeSe2 nanomaterials as cathode materials assembled into coin cell battery to test its electrochemical performance of FeSe2 nanomaterials initial discharge capacity as 362mAh / g capacity after 50 cycles calculated attenuation rate of 2.39% . The Hydrothermal Method nanomaterials lithiated FeSe2 its structure was characterized by means of XRD, SEM and other changes in the structure of the before and after lithiation, and test its electrochemical properties of lithium after FeSe2 nanomaterials electrochemical performance test studies have shown that nano cathode material not lithiated FeSe2 after 50 cycles capacity decay rate of 1.23%, the cycle stability has been improved, to investigate the structural changes and performance between before and after lithiation FeSe2 nanomaterials Contact. Hydrothermal method using glucose as the carbon source had different molar ratios FeSe2 / C nanocomposites, and prepared composite material is subjected to heat treatment at 500 ℃ using XRD, FESEM, Raman spectra before and after heat treatment different molar ratios The FeSe2 / C composites were characterized before heat treatment FeSe2 / C nanocomposites Electrochemical measurements show that: With the the glucose molar amount of the increase, the first discharge capacity decreased slightly before heat treatment different molar ratio FeSe2 / C nanocomposites capacity fading rate has a slight decrease compared with not complex FeSe2 of Nano cathode material, cycle stability has been some improvement. After heat treatment of different molar ratio FeSe2 / C nanocomposites capacity fading rate has been significantly reduced, cycle stability has been significantly improved.

Related Dissertations

  1. Study on Characteristics of Contiuous Fiber-Reinforced Metal Matrix Composites under Hypervelocity Projectile Impact,TB332
  2. Preparation and Tribological Properties of TZ3Y20A-SrSO4 Ceramic Matrix Composites,TB332
  3. Reactive Hot-Pressing and Mechanical Properties of （ZrB2-ZrO2）/BN Composites,TB332
  4. Study on Preparation of Composite Cross-linked Modified Modified Potato Starch,TS236.9
  5. Coupled Dynamics of Excitable Systems Base on Morris-Lecar Model,Q42
  6. Under microaerobic conditions closed calcium carbide furnace exhaust COS gas adsorption purification,X781
  7. The Preparation and Electrochemical Tests of Carbon Foam,O613.71
  8. Synthesis and Application of A Novel Series of Cation Hydrophobically Modified Polyacrylamide,TQ323.6
  9. Study on the Synthesis and Adsorption Behaviour of Chitosan Derivative,TS254.9
  10. Modification and Application of the Waste Fluorgypsum and the Treating of High Concentrations Fluoride Wastewater,X703
  11. Adsorption Effects of Phosphate and Chromium from Aqueous Solution by Adsorption Using LDH and Mg/Fe/Al Modified Montmorillonites,X703
  12. Study on Detection of Transgenic Ingredients in Genetically Modified Cottonseed Meal and Its Degradation during Feed Processing,S816
  13. Genetically Modified Food Ethics,B82-05
  14. Integrable Discretizations to a Class of Soliton Equations,O175.2
  15. Studies on Construction of Specific Gland Expressional Vector of HLF and Modified Fibroblast Cell Line,Q78
  16. LSGM electrolyte thin films and electrochemical properties of,TM911.4
  17. Preparation, Characterization and Application of Prussian Blue Composite Nanomaterials,TB383.1
  18. An Analysis on Consumers’ Cognition and Attitudes of Genetically Modified Edible Oil,F426.82
  19. Study on Quality Change and Prediction Model for Shelf-life of Chilled Pork,TS251.4
  20. Soil Erosion Simulation in Hilly Area of South China,S157
  21. Research of Electrochemical Immunosensor for Schistosomiasis Japonicum Diagnosis,R532.21

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile