Dissertation > Excellent graduate degree dissertation topics show

Design, Preparation, and Application of Composite Polymer Electrolyte Membrance Used for Lithium Ion Battery

Author: XuFeng
Tutor: ZhongMingQiang；XuLiXin
School: Zhejiang University of Technology
Course: Materials Physics and Chemistry
Keywords: composite polymer electrolyte ionic conductivity ordered mesoporous silica poly (methyl methacrylate) poly (ethylene oxide)
CLC: TM912
Type: Master's thesis
Year: 2011
Downloads: 79
Quote: 0
Read: Download Dissertation

Abstract


Aiming at developing advanced polymer lithium battery, preparation of polymer electrolyte, with higher ionic conductivity at room temperature and superior comprehensive properties, has been attracting considerable research attention in this field. In this paper, a type of specially designed ordered mesoporous silica （OMS） modified with polymer was synthesized and employed for modifying polymer electrolyte, including poly （methyl acrylate） （PMMA） and poly （ethylene oxide） （PEO） system, to explore a novel strategy for developing polymer electrolyte of high performance.（1） PMMA/PC/LiClO4/OMS-g-PMMA system The PMMA-grafted OMS （OMS-g-PMMA） was first synthesized by surface-initiated atom transfer radical polymerization （SI-ATRP） of methyl acrylate （MMA） from surface of OMS particle. The PMMA-matrix polymer electrolyte membrance, PMMA/PC/LiClO4/ OMS-g-PMMA, was then prepared by solution casting process using the prepared OMS-g-PMMA as fillers and propylene carbonate （PC） as plasticizer. FTIR, TGA, SAXRD and HRTEM results confirmed that PMMA chains have been successfully grafted on the surface of OMS particles with a grafting ratio of 0.20 g PMMA/g OMS. It was found from alternating current （AC） impedance analysis that the OMS-g-PMMA-filled PMMA system shows higher ionic conductivity than the OMS-filled one. The highest ionic conductivity （25℃） for the OMS-g-PMMA-filled system reaches 1.06×10-4 S cm-1, which higher by two grades than the filler-free parent PMMA system. Mechanical test and DSC analysis showed that both the mechanical properties and thermal stability of the modified PMMA system could be greatly improved upon modification with the OMS-g-PMMA.（2） PMMA/PC/LiClO4/e-OMS-g-PMMA system A surface-initiated atom transfer radical polymerization of MMA was first performed selectively from the exterior surface of the OMS particles to synthesize the PMMA-grafted core-shell OMS （e-OMS-PMMA）. The PMMA-matrix polymer electrolyte, PMMA/PC/ LiClO4/e-OMS-g-PMMA, was further prepared by solution casting method using the prepared e-OMS-PMMA as fillers and PC as plasticizer. FTIR, TGA, SAXRD and HRTEM results confirmed that the PMMA chains have been successfully grafted onto the exterior surface the OMS particles as a core remaining the integrity of pore structure. As comparison with the OMS-filled PMMA system, the OMS-g-PMMA-filled one shows a higher ionic conductivity, better mechanical properties and improved thermal stability as well. The highest ionic conductivity at room temperature reaches 1.59×10-4 S cm-1 for the OMS-g-PMMA-filled system, and the tensile strength and Young?s mold increased by 2.39 and 2.41 times, respectively, compared to the filler-free system, with an improvement in glass transition temperature （Tg） of 10℃.（3） PEO/LiClO4/SBA15-g-HBPE system A hyperbranched polyethylene （HBPE） was first grafted onto the surface of SBA15 particles via ethylene polymerization catalyzed with a late transitional metal catalyst, Pd-Diimine, covalently immobilized on the SBA15 particles to synthesize the HBPE-grafted SBA15 （SBA15-g-HBPE）. The prepared SBA15-g-HBPE was further used as filler to prepare the composite PEO-matrix polymer electrolyte, PEO/LiClO4/ SBA15-g-HBPE, via solution casting process. It is confirmed by FTIR, TGA, SAXRD, BET and HRTEM results that the HBPE could be homogeneously grafted onto the surface of SBA15 particles. DSC analysis shows that the crystallinity of PEO as matrix could be greatly reduced upon addition of the SBA15-g-HBPE within a certain range of concentration. The SBA15-g-HBPE-filled PEO system exhibits a better ionic conductivity compared to the pristine SBA15-filled one. The highest ionic conductivity at 25℃for the SBA15-g-8hHBPE-filled system reaches 1.51×10-5 S cm-1, which higher by one grade than the SBA15-filled system.

Related Dissertations

  1. Short pore Pd/Zr-Ce-SBA-15 Catalyst and Its Catalytic Performance VOCs,X511
  2. Preparation and Characterization of Porous Polymer Electrolyte,O631.23
  3. Studies on the Solid Electrolyte Materials of Polybenzimidazole,O633.5
  4. Preparation and Performance of Nano-composite Polymer Electrolytes,TM912
  5. Study on Electrochemical Properties of a Novel PEI-PEO-Based Composite Solid Polymer Electrolyte,TM912
  6. Fabrication and Modeling of Single Electron Transistor Based on the Ordered Mesoporous Thin Film,TN32
  7. Porous materials for hydrogen storage characteristics of the load NaAlH_4,TB383.4
  8. Toughening of PMMA Denture Base Materials Through Copolymerization,R783.1
  9. Study on Mesoporous Silica Xerogels Applied for Tissue Repair,TB321
  10. Preparation and Characterization on PEO-Based Layered Silicate Composite Polymer Electrolyte,TB332
  11. Study on Preparation and Performance of P(AN-MMA) Polymer Electrolyte,O631.3
  12. Methods,imaging and Biomechial Study of Vertebroplasty in Osteoporotic Spine,R816.8
  13. Synthesis and Photoluminescence of Eu/MCM-41 Ordered Mesoporous Composite Material,TB332
  14. Study on Synthesis and Photoluminescence of RE/SBA-15,TB34
  15. The Experimental Study of Modifying Artificial Tooth via Nano-SiO2 Treated by Coupling Agent KH-570,R783.6
  16. The Experimental Study of Modifying PMMA Denture Base Resin via Intercalated Montmorillonite,R783.6
  17. The Experimental Study on PMMA Artificial Tooth to Improve the Hardness and Antiwear with Nanotechnology,R783.6
  18. Study on the Synthesis of Functionized MCM-41 by Manganese Chemical Modification and Manganese Oxide Mesophase,TB383
  19. SiO_2 particles structure catalyst in situ generated (PEO) _8LiClO_4-SiO_2 composite membrane performance,O643.36
  20. Material Research of Poly(Methyl Methacrylate) in DNA Microarray Fabrication,R318.08
  21. Study on the Solid Polymer Electrolytes and Its Applications in Lithium Ion Battery,TM912

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