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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 56955 (07)
- University: Sharif University of Technology
- Department: Materials Science and Engineering
- Advisor(s): Sadrnezhaad, Khatiboleslam; Askari, Masoud
- Abstract:
- Nowadays, along with the increasing development of renewable energy sources such as solar and wind, the need to use cost-effective fixed energy storage systems with cyclic stability at high rates is increasing. Due to their abundance and high safety, aqueous rechargeable calcium-ion batteries have the potential to meet the growing needs of stationary energy storage devices. In addition, they can be produced at low cost and have a higher volume capacity. However, the electrochemical stability window, which is controlled by the hydrogen production reaction on the anode and the oxygen production reaction on the cathode, severely limits the application of electrode materials in aqueous batteries. The electrochemical stability window must be wide enough to allow the oxidation/reduction reaction of the elements and components inside the battery, because the production of even small amounts of hydrogen or oxygen seriously reduces the cycle life and Coulombic efficiency of the battery. In this project, by changing the salt, molality, or by adding 1,5-pentanediol diluent to hydrated calcium nitrate aqueous electrolytes and making a localized electrolyte, its physicochemical properties and electrochemical performance have been investigated. The results show that the addition of the diluent increases the electrochemical stability window, ionic conductivity, viscosity, and diffusion coefficient of calcium ion (Ca2+) and on the contrary, it decreases the electrical conductivity. The results of the charge-discharge tests also show that if 5,1-pentanediol diluent is added to the water electrolyte, capacity Retention of the copper hexacyanoferrate cathode in the first 200 cycles has increased from 55% in the aqueous electrolyte to 71% in the topical electrolyte. Also, the results of Raman spectroscopy show that the solvation structure of calcium ion in the presence of 5,1-pentanediol molecules is improved due to the increase in the neighboring of calcium ion, which improves the kinetics in this battery
- Keywords:
- Calcium-Ion Battery ; Localized Electrolyte ; 1,5-Pentanediol ; Copper Hexacyanoferrate ; Oxygen Reduction Reaction ; Hydrogen Evolution Reaction
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