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Fabrication of Water in Sugar Electrolyte for Use in Aqueous Calcium Batteries

Ghasemzadeh, Fatemeh | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57036 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Sadrnezhaad, Khatiboleslam; Askari, Massoud
  7. Abstract:
  8. Hydro energy storage systems have attracted much attention due to advantages such as high security, low cost, and environmental compatibility. However, the specific chemical properties of water cause the problems of narrow electrochemical stability window, low stability of water-electrode interface reactions, and dissolution of electrode materials and intermediate products; Therefore, new low-cost aqueous electrolytes with different water chemistry are needed. The nature of water largely depends on its hydroxyl-based hydrogen bonding structure; Therefore, ultraconcentrated hydroxyl-rich sugar solutions are designed to alter the original hydrogen bond structure of water. Ultra-concentrated sugars can reduce free water molecules and destroy the tetrahedral structure, so by breaking hydrogen bonds, they reduce the degree of connection of water molecules; Therefore, the aim of this research was to investigate the electrochemical performance of concentrated water-in-sugar electrolytes for calcium-aqueous batteries. In this regard, CuHCF cathode was first synthesized using co-precipitation method, then 2 molar calcium nitrate electrolyte with different percentages of sucrose was prepared, then a part of the resulting material was subjected to Raman spectroscopy, LSV, XRD, TGA and FE-SEM tests. the other part were placed to conduct electrochemical tests of the battery. The results showed that by increasing the percentage of sucrose in the electrolyte solution of calcium nitrate salt, the electrochemical properties of the samples improve in an ascending manner compared to the pure calcium nitrate electrolyte. Ionic electrolytes based on ultra-concentrated sugars have an expanded electrochemical stability window (up to 5.38 V) and suitable ionic conductivity (13.18 mS cm). 2C66.7Su electrolyte showed a specific discharge capacity of 48.06 mAh/g in the first cycle and a specific discharge capacity of 37.10 mAh/g after 100 cycles. The reason for these improved electrochemical properties can be attributed to the pH and chemistry of concentrated solutions. Also, by using the characterization methods of the chemical formula of synthesized CuHCF, K0.035Cu [Fe(CN)6] 0.543.6H2O was obtained
  9. Keywords:
  10. Calcium-Ion Battery ; Sucrose ; Copper Hexacyanoferrate ; Water in Sugar Electrolyte ; Calcium-Aqueous Battery Electrolyte

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