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طراحی و تولید الکترولیت باتری لیتیوم - یون توان بالا با بهسازی حلال های چندجزئی و افزودنی های الکترولیت
مقصودی، رقیه Maghsoudi, Roghayeh
Design and Fabrication of High-Power Lithium-Ion Battery Electrolytes via Optimization of Multi-Component Solvents and Electrolyte Additives
Maghsoudi, Roghayeh | 2026
2
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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 58910 (06)
- University: Sharif University of Technology
- Department: Chemical and Petroleum Engineering
- Advisor(s): Ramazani Saadatabadi, Ahmad; Babaei, Mohsen
- Abstract:
- With the global shift from fossil fuels to renewable energy, energy storage has become increasingly important. Lithium-ion batteries (LIBs), due to their high energy density and cycle stability, play a key role in this field, and one of their most important applications is in high-power batteries for electric vehicles, drones, and power tools.Electrolytes, as one of the key components in lithium-ion batteries, play a crucial role in determining the performance, safety, and lifespan of the battery. Proper design and formulation of electrolytes can have a significant impact on the capacity, thermal stability, and energy efficiency of these systems.
In this study, six multi-component electrolytes, composed of EC, EMC, and DMC, were designed and formulated for high-power batteries using phase diagrams. These solvents enhanced ionic conductivity, reduced viscosity, and improved thermal stability, enabling optimal performance at high current rates and across a wide temperature range. The samples were evaluated through CV, polarization, EIS, voltage profiling, cycling, and SEM tests. Results indicated that the EMD (15:22:63) electrolyte exhibited the best performance, delivering 72.47% of its capacity at 12C relative to 1C. In comparison, other samples performed less effectively: EMD (41:27:32): 60.77%, EMD (20:41:39): 53.29%, EMD (05:53:42): 44.02%, EMD (09:39:52): 55.86%, and EMD (27:02:71): 57.76%. This electrolyte showed more symmetrical peaks in CV, a more stable voltage profile with lower voltage drop, a polarization test output of 14.29 Wg-1 and internal resistance of 0.65 Ωg, and the lowest resistance (202 Ω at 20C) in EIS.SEM analysis revealed that EMD (15:22:63) had the least surface structural failure, with uniform particle distribution and a robust CEI layer, ensuring stable performance and long battery life. Collectively, these results confirm the superior performance of EMD (15:22:63); the optimized solvent composition, formation of a thin and robust CEI layer, high ionic conductivity, and low viscosity enable stable and optimal performance at high current rates and under harsh temperature conditions
- Keywords:
- Lithium Ion Batteries ; Organic Solvent ; Electrochemistry ; Electrolyte Solution ; Formulation ; Phase Diagram ; High Power Batteries ; Multi Component Electrolyte
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