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Targeted Multifunctional Fluorine-Rich Copolymer Coating Design for Ambient-Stable Prelithiated SiOC Anodes
Rong Chen1,2, Yixuan Fan2, Congcong Zhang1
1Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Macao, SAR, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 3, 2026
Summary
A new fluorine-rich copolymer coating protects prelithiated silicon oxycarbide electrodes from air exposure, significantly improving lithium-ion battery stability and performance. This breakthrough enables durable, ambient-stable electrodes for advanced energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Prelithiation enhances lithium-ion battery performance but prelithiated electrodes are sensitive to air.
- Protecting these electrodes is crucial for practical applications.
Purpose of the Study:
- To develop a protective coating for air-stable prelithiated electrodes.
- To investigate the efficacy of a fluorine-rich acrylate copolymer (PFMMA).
Main Methods:
- Synthesized poly(tridecafluorooctyl methacrylate-co-methyl methacrylate) (PFMMA) copolymer.
- Applied PFMMA as a coating on Li13Si4-prelithiated SiOC electrodes (preSiOC).
- Evaluated electrode performance and stability under various humidity conditions.
Main Results:
- PFMMA-coated electrodes (preSiOC/PFMMA) retained 97.4% capacity and 95.3% initial coulombic efficiency after 48h air exposure.
- Demonstrated robust cycling stability with 677.5 mAh·g⁻¹ after 100 cycles.
- Maintained functionality under extreme humidity (10% RH for 100 days, 90% RH for 3 days).
Conclusions:
- PFMMA acts as a multifunctional protective coating, stabilizing electrodes in air while maintaining ion/charge transport.
- The developed copolymer design enables durable, electrolyte-compatible interfaces for ambient-stable prelithiated electrodes.
- This approach accelerates the development of practical, high-performance lithium-ion batteries.
