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Updated: Jul 30, 2025
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Three-electrode Coin Cell Preparation and Electrodeposition Analytics for Lithium-ion Batteries
Published on: May 22, 2018
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Insights into the Lithium Nucleation and Plating/Stripping Behavior in Ionic Liquid-Based Electrolytes.
Dominik Stępień1,2, Beatrice Wolff3,4, Thomas Diemant1,2
1Helmholtz Institute Ulm (HIU), 89081 Ulm, Germany.
ACS Applied Materials & Interfaces
|May 19, 2023
Summary
Achieving 100% Coulombic efficiency (CE) in rechargeable lithium-metal batteries (LMBs) is key for high energy density. This study enhances lithium deposition reversibility using ionic liquid electrolytes and additives.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Rechargeable lithium-metal batteries (LMBs) promise higher energy densities.
- Zero-excess LMBs require highly reversible lithium deposition (near 100% Coulombic efficiency, CE).
- Lithium plating on current collectors is a critical challenge.
Purpose of the Study:
- Investigate lithium plating behavior in ionic liquid electrolytes.
- Optimize conditions for reversible lithium deposition on nickel current collectors.
- Enhance Coulombic efficiency for zero-excess LMBs.
Main Methods:
- Electrochemical techniques (e.g., cyclic voltammetry, galvanostatic cycling).
- Operando and in situ atomic force microscopy (AFM) for real-time imaging.
- Ex situ X-ray photoelectron spectroscopy (XPS) for surface analysis.
- Ionic liquid electrolytes: PYR14FSI with LiTFSI salt, and fluoroethylene carbonate (FEC) additive.
Main Results:
- Higher LiTFSI concentration reduced overpotential and improved lithium deposition homogeneity.
- Fluoroethylene carbonate (FEC) additive further decreased overpotential.
- FEC stabilized the solid electrolyte interphase (SEI), significantly boosting CE.
Conclusions:
- Optimized ionic liquid electrolyte composition (high LiTFSI) promotes uniform lithium plating.
- FEC additive is crucial for stabilizing the SEI and achieving high CE in zero-excess LMBs.
- This work advances the development of high-energy-density rechargeable lithium-metal batteries.
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