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Stable cycling of graphite in an ionic liquid based electrolyte.
Michael Holzapfel1, Carsten Jost, Petr Novák
1Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland. michael.holzapfel@psi.ch
Chemical Communications (Cambridge, England)
|September 16, 2004
Summary
1-Ethyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide (EMI-TFSI) enables reversible lithium intercalation into graphite with vinylene carbonate additive. This ionic liquid combination is key for advanced battery materials.
Area of Science:
- Electrochemistry
- Materials Science
- Battery Technology
Background:
- Ionic liquids offer unique electrochemical properties for energy storage.
- Graphite is a standard anode material in lithium-ion batteries.
- Electrolyte additives are crucial for improving battery performance and stability.
Purpose of the Study:
- To investigate the effect of 1-Ethyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide (EMI-TFSI) on lithium intercalation in graphite.
- To determine the role of vinylene carbonate as an additive in EMI-TFSI based electrolytes.
- To assess the reversibility of lithium intercalation facilitated by this electrolyte system.
Main Methods:
- Electrochemical testing of graphite anodes in EMI-TFSI electrolytes.
- Inclusion of small amounts of vinylene carbonate as an electrolyte additive.
- Analysis of lithium intercalation and deintercalation behavior.
Main Results:
- Demonstrated reversible lithium intercalation into standard graphite.
- EMI-TFSI in combination with vinylene carbonate facilitates the process.
- The system shows potential for stable lithium-ion battery operation.
Conclusions:
- EMI-TFSI with vinylene carbonate is a promising electrolyte system for graphite anodes.
- This combination enables efficient and reversible lithium storage.
- Further research into this system could lead to improved battery designs.