Investigation of Crystallization Behavior and Electrical Properties of Glass-Ceramics in the Li2O-TiO2-P2O5 System

Mohaghegh, Elnaz | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45376 (07)
  4. University: Sharif University of Technology
  5. Department: Material Science & Engineering
  6. Advisor(s): Nemati, Ali; Eftekhari Yekta, Bijan; Banijamali, Sara
  7. Abstract:
  8. During the past two decades, much attention has been paid to rechargeable lithium batteries, because they have high energy density. Glass-ceramics is a category of this material, which may be of great potential as solid electrolytes.. The object of this thesis is preparation of Li2O-TiO2-P2O5 glass, glass-ceramic and investigation their electrical behavior. Prepared Samples were investigated by Differential thermal analysis (DTA), X-ray diffraction (XRD), Scanning electron microscopy (SEM), UV-Visible spectroscopy and Electrochemical impedance spectroscopy (EIS). In this study LiTi2(PO4)3 crystals were crystallized in a glass with the composition 45Li2O-25TiO2-30P2O5 (molar ratio). According to the SEM micrographs, it seems that average size of LiTi2(PO4)3 particles in this glass-ceramic, was less than 50nm and addition 5 weight ratio of Fe2O3 to this system improved glass-forming, crystallization behavior and electrical conduction. Studies indicate that crystallization temperature of LiTi2(PO4)3 decreased with addition of Fe2O3 and the maximum room temperature bulk conductivity of 1.38×10-3(S.cm-1) was obtained for 17.69Li2O-26.28TiO2-56.03P2O5-5Fe2O3 (weight ratio) glass-ceramics
  9. Keywords:
  10. Electrochemical Impedance Spectroscopy ; Electrical Properties ; Glass-Ceramic

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