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Fluorinated hybrid solid-electrolyte-interphase for dendrite-free lithium deposition
Rajesh Pathak1, Ke Chen1, Ashim Gurung1
1Department of Electrical Engineering and Computer Science, Center for Advanced Photovoltaics and Sustainable Energy, South Dakota State University, Brookings, SD, 57007, USA.
Nature Communications
|January 5, 2020
Summary
Researchers developed a new artificial solid electrolyte interphase for lithium metal anodes. This protective layer enhances battery performance by suppressing dendrite growth and improving cycling stability.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal anodes offer high theoretical capacity but suffer from reactivity issues.
- Lithium dendrite growth and unstable solid electrolyte interphase (SEI) formation hinder practical application.
- Developing stable interfaces is crucial for advanced lithium metal batteries.
Purpose of the Study:
- To create a stable artificial solid electrolyte interphase (SEI) on lithium metal anodes.
- To improve the cycling stability and rate capability of lithium metal batteries.
- To investigate a facile and cost-effective method for interface engineering.
Main Methods:
- A one-step treatment of lithium anodes with a tin-containing electrolyte.
- Formation of an artificial SEI composed of lithium fluoride, tin, and tin-lithium alloy.
- Electrochemical testing of lithium symmetrical cells and full cells with the modified anode.
Main Results:
- The artificial SEI effectively suppresses lithium dendrite growth.
- Enhanced lithium-ion diffusion and reversible lithium storage via tin-lithium alloy formation.
- Significantly improved cycling stability, capacity retention, and high-rate performance compared to bare lithium anodes.
Conclusions:
- The developed artificial SEI provides a stable and efficient interface for lithium metal anodes.
- This approach offers a promising strategy for realizing high-performance lithium metal batteries.
- The synergistic effects of the artificial SEI contribute to superior electrochemical performance.
