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Published on: December 20, 2016
LiTFSI Concentration Optimization in TEGDME Solvent for Lithium-Oxygen Batteries
Jingwen Chen1, Chunguang Chen1, Tao Huang1
1Laboratory of Advanced Materials and Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200438, China.
Optimizing lithium salt concentration in nonaqueous electrolytes enhances lithium-oxygen battery performance. Higher concentrations (0.4 and 1.5 M LiTFSI) improved discharge capacities and cyclability in TEGDME electrolytes.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Lithium-oxygen batteries offer high theoretical energy densities and environmentally friendly characteristics.
- Nonaqueous organic electrolytes are crucial for ion and oxygen transfer in lithium-oxygen batteries.
- Understanding the role of electrolyte properties is key to improving battery performance.
Purpose of the Study:
- To systematically investigate the effect of lithium salt concentration on lithium-oxygen battery performance.
- To identify optimal lithium salt concentrations for enhanced electrochemical performance.
- To elucidate the relationship between electrolyte properties and battery functionality.
Main Methods:
- Electrochemical performance testing of lithium-oxygen batteries with varying LiTFSI concentrations in TEGDME.
- Cyclic voltammetry to analyze system stability and reaction mechanisms.
- Scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS) to examine surface morphology and interface impedance.
Main Results:
- Discharge capacities and cyclabilities showed a positive correlation with lithium salt concentration.
- 0.4 M and 1.5 M LiTFSI concentrations yielded the best discharge capacities and cyclabilities.
- The 0.4 M LiTFSI system achieved a specific capacity of 7000 mAh g-1, surpassing the 1 M system.
Conclusions:
- Optimized lithium salt concentration significantly impacts lithium-oxygen battery performance.
- Conductivity and viscosity are critical factors, while oxygen solvation has minimal effect.
- Further research into electrolyte optimization can unlock the full potential of lithium-oxygen batteries.
