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Constructing a Synergistic Triple Layer Interfacial Design for Dendrite-Free and High-Performance Lithium Metal
Chan Young Oh1, Yonghwan Kim1, Won Young An1
1Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Suwon-si, Gyeonggi-do 16229, Republic of Korea.
ACS Applied Materials & Interfaces
|May 19, 2026
Summary
A novel synergistic triple layer on nickel foam stabilizes lithium metal anodes by enhancing ionic and electronic conductivity, suppressing dendrite growth, and improving cycling stability for high-energy batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal anodes offer high energy density but suffer from unstable solid-electrolyte interphase (SEI) formation, non-uniform deposition, and volume fluctuations.
- Existing 3D hosts and double-layer strategies using inorganic species like LiF and Li2S improve ion conductivity but face challenges with low electronic conductivity and high interfacial resistance.
Purpose of the Study:
- To develop a novel interfacial layer for lithium metal anodes that enhances both ionic and electronic conductivity.
- To improve the stability and cycling performance of lithium metal anodes by addressing SEI instability and dendrite growth.
Main Methods:
- Fabrication of a synergistic triple layer on nickel foam (STLG@NF) via in situ electrochemical conversion of Ni3S2.
- Characterization of the triple layer's composition and structure, including a Li2S-rich bottom layer, a middle carbon layer, and an outer SEI layer.
- Electrochemical testing of Li-STLG@NF anodes in symmetric and LiFePO4 full cells to evaluate stability, overpotential, and capacity retention.
Main Results:
- The STLG@NF anode exhibited a Li2S-rich bottom layer for high ionic conductivity, a carbon middle layer for electronic conductivity and mechanical support, and a stable outer SEI.
- Symmetric cells demonstrated over 3000 hours of stability with a low overpotential of 11 mV.
- LiFePO4 full cells maintained over 80% capacity after 500 cycles, indicating excellent long-term performance and structural integrity.
Conclusions:
- The synergistic triple layer effectively stabilizes interfacial reactions and suppresses lithium dendrite growth.
- The developed anode architecture significantly enhances the electrochemical performance and cycle life of lithium metal batteries.
- This approach offers a promising strategy for realizing high-energy-density lithium metal anodes.
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