Dissertation > Excellent graduate degree dissertation topics show

Study on Preparation and Performance of Gel Ionic Liquid/Polymer Electrolytes

Author: HuangXueYuan
Tutor: GuoJianPing；YinZuoLin
School: Hunan Normal University
Course: Organic Chemistry
Keywords: Ionic liquids Gel-type polymer electrolyte Ionic conductivity Thermal stability Lithium ion transference number Electrochemical window
CLC: TM912
Type: Master's thesis
Year: 2009
Downloads: 256
Quote: 1
Read: Download Dissertation

Abstract


Lithium-ion batteries and super capacitors organic aprotic solvent mostly used as a plasticizer, it volatile, leakage will not only reduce the battery capacity, but also pollute the environment. To improve the gel-type polymer electrolyte thermal stability, ionic liquids as plasticizers in recent years been increasingly extensive research and development. However, these are mostly conductivity of the electrolyte can only reach 10 -4 S · cm -1 , can not meet the requirements of practical applications (gt; 10 -3 S · cm -1 ). Thus, not only has good thermal stability and can meet the requirements of high-conductivity gel-type polymer electrolyte has a broad application prospects. This two-step synthesis of a series of stable, ionic liquids with different compositions: [BMIM] BF 4 , [BMIM] PF 6 , [BMIM] Cl-ZnCl 2 , [BMIM] H 2 PO 4 . By IR structural characterization was carried out. First prepared by in situ polymerization of L-containing acidic ionic liquid [BMIM] Cl-ZnCl 2 gel-type polymer electrolyte, and its properties were studied. The results show that when n ([BMIM] Cl-ZnCl 2 ) / n (vinyl monomer) is 7:3, the ionic conductivity is about 0.36 × 10 -3 S · cm -1 ; thermal stability better than traditional aprotic solvent as a plasticizer in the electrolyte system. In order to improve the conductivity of the gel-type polymer electrolyte, the use of [BMIM] Cl-ZnCl 2 and an aprotic solvent PC, DMC as a plasticizer to form a mixed solution, the conductivity increased significantly, up to 2.83 × 10 -3 S · cm -1 , and the VTF equation found with temperature, the thermal decomposition temperature of the polymer electrolyte is greater than 275 ℃, show good thermal stability sex. Meanwhile containing ionic liquids were synthesized [BMIM] BF 4 or [BMIM] PF 6 and a series of aprotic solvent gel-type polymer electrolyte, and its performance studied. The results showed that the room temperature ionic conductivity of the polymer electrolyte more than 10 -3 S · cm -1 , and with the temperature changes are consistent with VTF equation; PHEMA PC [BMIM] BF 4 and PHEMA LiBF 4 PC DMC [BMIM] BF 4 ionic conductivity was 1.33 × 10 -3 S · cm -1 , and 1.46 × 10 -3 S · cm -1 ; thermal decomposition temperature higher than 260 ℃, at 80 ℃ weight loss is less than 0.87%; electrolyte containing lithium salt is greater than 0.34 the lithium ion transference number, electrochemical window of 4.3V. PMMA PC [BMIM] PF 6 and PMMA LiPF 6 PC DMC [BMIM] PF 6 ionic conductivity was 3.44 × 10 -3 S · cm -1 and 10.05 × 10 -3 S · cm -1 ; thermal decomposition temperature higher than 250 ℃ , at 80 ℃ weight loss less than 0.97%; containing lithium salt electrolyte lithium ion transference number greater than 0.3, electrochemical window of up to 5.1V. Prepared by in situ polymerization of the first B-containing acidic ionic liquid [BMIM] H 2 PO 4 gel-type polymer electrolyte, and its properties were studied. The results show that the conductivity of the polymer electrolyte with the ionic liquid content, H 3 PO 4 of the content and the temperature increases. When n ([BMIM] H 2 PO 4 ) / n (HEMA) was 7:3, the ionic conductivity of 6.20 × 10 -3 S · cm -1 , when n ([BMIM] H 2 PO 4 ) / n (MA) is 7:3 the ionic conductivity was 5.94 × 10 -3 S · cm -1 ; excluding H 3 PO 4 thermal stability of the polymer electrolyte is superior to conventional aprotic solvent as a plasticizer in the electrolyte system, the thermal decomposition temperature above 258 ℃.

Related Dissertations

  1. Synthesis of Benzimidazolium Ionic Liquids and Their Application in Extraction Separation,O626.23
  2. Thermal Stability of Complexes of Chitosan Quaternary Ammonium Salt and Metal Ion,O634
  3. Synthesis and Application of the chloro- methoxy fatty acid methyl esters,TQ414.8
  4. Syntheses, Structures and Properties of Metal-organic Frameworks Based on Dicarboxylate Ligands,O621.13
  5. Study on Dehydration of tert-Butyl Alcohol Catalyzed by Functionalized Ionic Liquid,O643.32
  6. Studies on the Aggregation and Microstructure of Imidazolium Ionic Liquids in Solutions,O645.1
  7. Imidazolium ionic liquids selective electrode and its research activity coefficient,O646
  8. Benzothiazole - pyrimidine nucleoside hybrid body and pyrone and pyrimidine synthesis of bicyclic nucleoside,O626
  9. An ionic liquid to red carp immunotoxicity,S917.4
  10. Imidazolium ionic liquids Thermal Analysis,O626.23
  11. Synthesis of t- butyl alcohol using tert-butylbenzene, the catalyst selection and research,TQ241.1
  12. Research and Engineering Improvement of Gelatin一based Gummy on Its Thermodynamie Stability,TQ461
  13. Investigation of Ionic Liquids as Solvent for Extractive Separation of Benzene and Cyclohexane,TQ202
  14. Screening Mutational Sites That Enhance Protein Thermostability by High Temperature Molecular Dynamics Method,Q51-33
  15. Synthesis and Surface-active Properties of Novel Quaternary Ammonium Salt Gemini Surfactants,TQ423
  16. Synthesis of Functional Ionic Liquids and Characteristics of CO2 Capture,X773
  17. Detection of Pollutant Gas by the Ionic Liquids Film for Cultural Heritage Preservation,TP212.9
  18. Study of SiN x -Doped SbTe Phase-Change Materials for Phase-Change Random Access Memory,TP333
  19. Functional Materials Modified Electrode and Its Application,TB34
  20. 10kV grounding resistor Thermal Stability,TM862
  21. Microwave in ionic liquids for catalytic degradation of PET recycling study on the application of terephthalic acid,O631.3

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