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A BF3 -Doped MXene Dual-Layer Interphase for a Reliable Lithium-Metal Anode
Mingwei Shang1, Osman Goni Shovon1, Francis En Yoong Wong1
1Department of Materials Science and Engineering, CEAS, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA.
Advanced Materials (Deerfield Beach, Fla.)
|December 16, 2022
Summary
A novel dual-layer interphase enhances lithium metal anodes by forming a stable solid electrolyte interface (SEI). This BF3-doped MXene coating promotes uniform lithium deposition, enabling dendrite-free batteries with improved cycling stability and capacity retention.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal anodes are crucial for high-energy-density batteries.
- Achieving stable cycling requires mitigating dendrite formation and maintaining a robust solid electrolyte interface (SEI).
- Existing SEI layers often suffer from poor uniformity and mechanical instability, limiting battery performance.
Purpose of the Study:
- To develop a dual-layer interphase for stabilizing lithium metal anodes.
- To improve the uniformity of lithium deposition and suppress dendrite growth.
- To enhance the electrochemical performance and cycling stability of lithium metal batteries.
Main Methods:
- Fabrication of a dual-layer interphase comprising an in-situ-formed lithium carboxylate organic layer and a BF3-doped Ti3C2 MXene monolayer on Li metal.
- Electrochemical characterization using symmetric cells to evaluate cycling performance and overpotential.
- Assembly and testing of coin and pouch cells with Li metal anodes and NCA cathodes.
Main Results:
- The dual-layer interphase significantly enhances electrolyte wetting and reduces SEI thickness.
- BF3-doped MXene promotes homogeneous lithium nucleation and growth, reducing the inorganic SEI component by approximately 50%.
- Achieved low overpotential (<30 mV over 1000 h cycling) and dendrite-free lithium plating/stripping, demonstrating excellent anode stability.
- Demonstrated high capacity retention (175.4 mAh g-1 at 1.0 C after 350 cycles) in coin cells and (90.2% after 200 cycles) in 475 mAh pouch cells.
Conclusions:
- The dual-layer interphase effectively stabilizes the lithium metal anode by promoting uniform lithium deposition and suppressing dendrite formation.
- The BF3-doped MXene layer provides active sites and enhances electronic conductivity, crucial for reducing interfacial resistance.
- This approach offers a promising strategy for developing high-performance and long-lasting lithium metal batteries.
