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Lithium Iron Silicate Sol-Gel Synthesis and Electrochemical Investigation

Oghbaei, Morteza | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43587 (07)
  4. University: Sharif University Of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Asgari, Sirous
  7. Abstract:
  8. Recently lithium iron silicate (Li2FeSiO4) has been used as a new cathode material for lithium ion battery. Li2FeSiO4 has such benefits like low raw material price so lower production cost, lower environmental pollution, higher safety, electro chemical and cyclic stability and high theoretical capacity of 166 mAh/g against other cathode materials like LiMn2O4, LiBNiO2, LiCoO2 and LiFePO4. In this research Li2FeSiO4 was synthesized through sol gel synthesis method and effect of chelating agent concentration, calcination temperature and time has been investigated. To determine the appropriate calcination temperature range, TG/DTA was performed. Then the dried gel powder was calcined at each temperature of 650°C, 700°C and 750°C for 1, 2 and 3 hours. For comparing the effect of chelating agent concentration, citric acid with molar ratio of 1/3, 2/3 and 1 were used. 700°C and 1 hour were determined as the best calcination temperature and time and 1/3 for the chelating agent concentration. FE-SEM observation showed mean grain size lower than 100nm. By using this material, a battery was assembled and charge-discharge test were performed. The result showed that the appropriate capacity will be achieved at current density of 0.05C. With respect to the achieved results sol gel synthesis is applicable method to produce lithium iron silicate nano powder for lithium ion battery applications
  9. Keywords:
  10. Electrochemical Properties ; Lithium Ion Batteries ; Sol-Gel Method ; Lithium Iron Silicate

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