Highly Concentrated LiTFSI-EC Electrolytes for Lithium Metal Batteries
Artikel i vetenskaplig tidskrift, 2020

Concentrated electrolytes have the potential to increase the stability for batteries with lithium metal anodes. In this study, liquid electrolytes were created by mixing ethylene carbonate (EC), a solid at room temperature, with a high concentration of LiTFSI salt. The binary LiTFSI-EC highly concentrated electrolytes have the benefit of extremely low volatility as compared to conventional organic electrolytes and also allow for cycling vs Li metal anodes. Using a LiTFSI-EC electrolyte with molar ratio 1:6, the Coulombic efficiency for Li plating/stripping on Cu is 97% at a current density of 1 mA cm-2 with a 2 mAh cm-2 capacity, pointing to a practically useful performance. In a full cell setup using a commercial LiFePO4 (LFP) cathode, the efficiency is maintained, proving compatibility. In comparison to other carbonate-based electrolytes, there is less accumulation of decomposition products on the surface of a cycled Li film, which in part explains the improved cycle life. In all, this electrolyte system shows promise in terms of electrochemical stability and may allow for safe Li metal batteries due to the inherent physical stability.

anode free

safe electrolyte

Li metal anode

highly concentrated electrolyte

ethylene carbonate


Viktor Nilsson

Uppsala universitet

Alistore - European Research Institute

Chalmers, Fysik, Materialfysik

Antonia Kotronia

Uppsala universitet

Matthew Lacey

Uppsala universitet

K. Edstrom

Alistore - European Research Institute

Uppsala universitet

Patrik Johansson

Alistore - European Research Institute

Chalmers, Fysik, Materialfysik

ACS Applied Energy Materials

25740962 (eISSN)

Vol. 3 1 200-207


Oorganisk kemi


Annan kemiteknik

Annan fysik



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