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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Electrolyte engineering via ether solvent fluorination for developing stable non-aqueous lithium metal batteries.
Yan Zhao1, Tianhong Zhou1, Mounir Mensi2
1Department of Chemistry, University of Fribourg, Fribourg, 1700, Switzerland.
Nature Communications
|January 18, 2023
Summary
Targeted trifluoromethylation of 1,2-dimethoxyethane to create 1,1,1-trifluoro-2,3-dimethoxypropane (TFDMP) enhances lithium metal battery electrolytes. This novel solvent improves ionic conductivity and electrochemical stability for better battery performance.
Area of Science:
- Electrochemistry
- Materials Science
Background:
- Fluorination of ether solvents enhances electrochemical stability in lithium metal batteries.
- Over-fluorination reduces ionic conductivity, hindering battery performance.
Purpose of the Study:
- To maximize ionic conductivity and electrochemical stability in lithium metal battery electrolytes.
- To introduce a novel trifluoromethylated ether solvent for improved battery performance.
Main Methods:
- Synthesized 1,1,1-trifluoro-2,3-dimethoxypropane (TFDMP) via targeted trifluoromethylation of 1,2-dimethoxyethane.
- Prepared a 2 M non-aqueous electrolyte solution using TFDMP and bis(fluorosulfonyl)imide salt.
- Tested electrolyte performance in coin cells with lithium metal anodes and high-mass-loading cathodes.
Main Results:
- The TFDMP-based electrolyte exhibited an ionic conductivity of 7.4 mS cm⁻¹ at 25°C.
- Achieved excellent oxidation stability up to 4.8 V and suppressed aluminum corrosion.
- Demonstrated high discharge capacity retention (81% after 200 cycles, 88% after 142 cycles) in lithium metal battery tests.
Conclusions:
- Targeted trifluoromethylation offers a promising strategy for developing advanced lithium metal battery electrolytes.
- TFDMP-based electrolytes balance high ionic conductivity with superior electrochemical stability.
- The developed electrolyte shows potential for high-energy-density lithium metal batteries.
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