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Co-precipitation Synthesis Parameters of Lithium-rich Cathode Material

Seraji, Pardis | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54443 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Sadrnezhaad, Khatiboleslam
  7. Abstract:
  8. Electric vehicles and electronics such as laptops and smartphones require an efficient amount of energy conversion and storage. As one of the reliable systems in this field, lithium-ion batteries have high energy density and lower emissions. Cathodic material is a bottleneck in the development of lithium-ion systems due to its high cost and limited energy capacity. In this study, lithium-rich oxide cathode was synthesized in the liquid phase using the co-precipitation synthesis method using six-aqueous nickel nitrate and four-aqueous manganese chloride precursors. The material was analyzed by structural characterization analysis as well as electrochemical characterizations. In this project, the PH of the solution in the synthesis process and the effect of the surfactant on the characteristics of the final product were investigated. Various characteristics of the samples were examined by physical characterization methods such as scanning electron microscopy, X-ray diffraction, and Raman Microscopy to examine the microstructural and phase properties as well as the electrochemical charge/discharge test. It was found that increasing the PH leads to uniform particle size. On the other hand, the addition of CTAB surfactant changes the spinel structure to layered. The sample with nanosize structure and layered phase showed the best electrochemical performance. The transformation between spinel and layered phase was confirmed by XRD and Raman tests. The optimal sample was produced at pH=7/5. In the synthesis medium, the molar ration of CTAB to the sum of manganese and nickel was 1:1. The average charge capacity was 200mAh/g, and the discharge capacity was 198 mAh/g
  9. Keywords:
  10. Lithium Ion Batteries ; Layered Oxides ; Layered Structure ; Co-Precipitation ; Co-Precipitation Synthesis

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