Deep Eutectic Solvent Based on Lithium Bis[(trifluoromethyl)sulfonyl] Imide (LiTFSI) and 2,2,2-Trifluoroacetamide (TFA) as a Promising Electrolyte for a High Voltage Lithium-Ion Battery with a LiMn
| Autor: | Phuong Hoang Tran, Watchareeya Kaveevivitchai, Kieu T. T. Tran, Linh T. M. Le, Tuyen T. T. Truong, Oanh Hoang Nguyen, Man V. Tran, Thai T. A. Dinh, Phung My Loan Le, Tuyen Thi Kim Huynh |
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| Rok vydání: | 2020 |
| Předmět: |
Sulfonyl
chemistry.chemical_classification Trifluoromethyl Materials science General Chemical Engineering Inorganic chemistry chemistry.chemical_element General Chemistry Electrolyte Article Lithium-ion battery Deep eutectic solvent Chemistry chemistry.chemical_compound chemistry Lithium Imide QD1-999 Eutectic system |
| Zdroj: | ACS Omega ACS Omega, Vol 5, Iss 37, Pp 23843-23853 (2020) |
| ISSN: | 2470-1343 |
| Popis: | To design safe and electrochemically stable electrolytes for lithium-ion batteries, this study describes the synthesis and the utilization of new deep eutectic solvents (DESs) based on the mixture of 2,2,2-trifluoroacetamide (TFA) with a lithium salt (LiTFSI, lithium bis[(trifluoromethane)sulfonyl]imide). These prepared DESs were characterized in terms of thermal properties, ionic conductivity, viscosity, and electrochemical properties. Based on the appearance of the product and DSC measurements, it appears that this system is liquid at room temperature for LiTFSI mole fraction ranging from 0.25 to 0.5. At χLiTFSI = 0.25, DESs exhibited favorable electrolyte properties, such as thermal stability (up to 148 °C), relatively low viscosity (42.2 mPa.s at 30 °C), high ionic conductivity (1.5 mS.cm–1 at 30 °C), and quite large electrochemical stability window up to 4.9–5.3 V. With these interesting properties, selected DES was diluted with slight amount of ethylene carbonate (EC). Different amounts of EC (x = 0–30 %wt) were used to form hybrid electrolytes for battery testing with high voltage LiMn2O4 cathode and Li anode. The addition of the EC solvent into DES expectedly aims at enhancing the battery cycling performance at room temperature due to reducing the viscosity. Preliminary results tests clearly show that LiTFSI-based DES can be successfully introduced as an electrolyte in the lithium-ion batteries cell with a LiMn2O4 cathode material. Among all of the studied electrolytes, DES (LiTFSI: TFA = 4:1 + 10 %wt EC) is the most promising. The EC-based system exhibited a good specific capacity of 102 mAh.g–1 at C/10 with the theoretical capacity of 148 mAh.g–1 and a good cycling behavior maintaining at 84% after 50 cycles. |
| Databáze: | OpenAIRE |
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