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Lithiophilic interface via tiny coordination dispersion enabling dendrite-free lithium metal anodes
Chen Liu1, Wei Zhang2, Yiran Yang1
1State Key Laboratory of Space Power-Sources, MOE Engineering Research Center for Electrochemical Energy Storage and Carbon Neutrality in Cold Regions, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
Engineered copper mesh with S/P/Zn modification enables uniform lithium plating in lithium metal batteries (LMBs). This strategy enhances cycling stability and safety, addressing key challenges for high-energy-density battery applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal batteries (LMBs) offer high energy density but suffer from dendrite growth and poor cycling stability.
- Uncontrolled lithium plating and consumption lead to capacity fade and safety hazards in LMBs.
Purpose of the Study:
- To develop a modified current collector for LMBs that regulates lithium deposition and improves battery performance.
- To address dendrite proliferation and enhance the cycling stability and safety of LMBs.
Main Methods:
- Fabrication of a S/P/Zn modified copper mesh (mCu@HCl-Zn-DDTP) using acid-etching and coordination.
- Characterization of the modified mesh for uniform lithium plating and solid electrolyte interphase (SEI) formation.
- Electrochemical testing of the modified current collector in half and full cells (with LFP cathode).
Main Results:
- The modified copper mesh facilitated uniform lithium plating, suppressing dendrite formation.
- Enhanced lithophilicity and stable inorganic components (Li2S, Li3P, Li2O) in the SEI were observed.
- Achieved 1000 stable cycles in half cells at 0.5 mA/cm² and >95% capacity retention in full cells after 500 cycles at 2C and 5C.
Conclusions:
- The S/P/Zn modified copper mesh is an effective strategy for improving lithium metal battery performance.
- This approach successfully mitigates interfacial challenges, enabling stable and safe high-energy-density LMBs.
- The developed current collector engineering strategy paves the way for practical applications of advanced battery technologies.
