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Catalytic Chemistry Derived Artificial Solid Electrolyte Interphase for Stable Lithium Metal Anodes Working at
Yifeng Cheng1,2, Zhijie Wang3, Jinbiao Chen1
1Institute of Batteries, School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China.
Angewandte Chemie (International Ed. in English)
|June 7, 2023
Summary
Researchers developed a new artificial solid electrolyte interphase (SEI) layer using polyamide-lithium hydroxide (PA-LiOH) to prevent dendrite growth in lithium metal anodes (LMAs). This breakthrough enables stable, long-term cycling for advanced battery applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Stable solid electrolyte interphase (SEI) layers are critical for the long-term cycling performance of lithium metal anodes (LMAs).
- Natural SEI layers often exhibit structural disorder and chemical inhomogeneity, leading to lithium dendrite growth and electrode pulverization, hindering practical LMA applications.
Purpose of the Study:
- To design and implement a catalyst-derived artificial SEI layer with an ordered bi-phase structure.
- To modulate ion transport and promote dendrite-free lithium deposition on LMAs.
Main Methods:
- Fabrication of a polyamide-lithium hydroxide (PA-LiOH) bi-phase artificial SEI layer.
- Characterization of the SEI layer's structure and its effect on ion transport and lithium deposition.
- Electrochemical testing of optimized LMAs in Li||Li symmetric and Li half cells under various current densities and cycling conditions.
Main Results:
- The PA-LiOH artificial SEI layer effectively suppressed volume changes and parasitic reactions of LMAs during lithium plating/stripping.
- Optimized LMAs demonstrated over 1000 hours of stable cycling at 20 mA cm⁻² in Li||Li symmetric cells.
- A high coulombic efficiency of 99.2% was achieved in Li half cells after 500 cycles at 1 mA cm⁻² in additive-free electrolytes.
Conclusions:
- The designed PA-LiOH artificial SEI layer provides an effective strategy for achieving stable and high-performance lithium metal anodes.
- This approach addresses key challenges in LMA technology, paving the way for their practical application in next-generation batteries.
