Loading...

Synthesis and Characterization of Al-Doped Li7la3zr2o12 Garnet as a Solid Electrolyte for Li-Ion Batteries

Ashury, Mahnaz | 2019

742 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51867 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Faghihi Sani, Mohammad Ali
  7. Abstract:
  8. Li7La3Zr2O12 (LLZO) solid-state electrolyte is a very promising electrolyte for a variety of ion lithium solid-state batteries, due to high conductivity of Li ions at room temperature as well as its chemical stability with Li metal anode. LLZO phase has two tetragonal and cubic symmetries. The conductivity of the cubic phase is two times higher than that for the tetragonal phase. To stabilize the cubic phase at room temperature, 0.2, 0.25, and 0.3 mol% Aluminum was doped to LLZO solid-state electrolyte. This powder was synthesized by sol-gel combustion method at 1000˚C. The cubic phase and lack of impurity of the samples doped with 0.25 and 0.3% Aluminum were determined by X-ray Diffraction (XRD) method. The powders were pressed using a 1.5 cm diameter die by cold isostatic press (CIP) method. These pellets were sintered in different temperatures and times in order to determine the optimum conditions of the sintering. The prepared pellets were analyzed by XRD method. It was shown that all pellets had cubic phases. The cross-section of the samples was characterized by Scanning Electron Microscopy (SEM). The samples were also investigated by Electrochemical Impedance in the frequency range of 0.1 HZ to 1MHZ and 10 mv voltage. The bulk and total ion conductivity of the pellet doped with 0.25 mol% Aluminum was shown to be 4.5×10-4 and 1.07×10-5s/cm, respectively, which was the best conductivity achieved in this research
  9. Keywords:
  10. Ion Lithium Solid-State Batteris ; Solid Electrolyte ; Sol-Gel Method ; Lithium Electrolyte Batteries ; Lithium Ion Batteries ; Ionic Conductivity

 Digital Object List

 Bookmark

No TOC