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Published on: March 7, 2018
Spiropyran-Based Luminescent Polymer Artificial SEI for Interphase Visualization and High-Performance Lithium Metal
Siyu Yu1, Tuoya Naren1, Jinqiang Gao1
1State Key Laboratory of Powder Metallurgy, Central South University, Changsha, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 13, 2026
Summary
A novel luminescent polymer, P-FMA, acts as an artificial solid electrolyte interphase (SEI) for lithium metal anodes. It enhances stability and suppresses dendrite growth, improving battery performance and enabling interface monitoring.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Ester-based electrolytes show high conductivity but lack stability with lithium metal, causing decomposition and dendrite growth.
- Developing stable solid electrolyte interphases (SEIs) is crucial for advanced lithium metal batteries.
Purpose of the Study:
- To design and construct a luminescent polymer (P-FMA) as an artificial SEI for lithium metal anodes.
- To investigate the polymer's ability to provide optical readout of interface evolution and enhance battery performance.
Main Methods:
- Synthesized P-FMA integrating spiropyran, fluorine, and methoxyethoxy groups.
- Fabricated Li||Li symmetric and Li||LiFePO4 full cells using P-FMA modified lithium anodes.
- Evaluated electrochemical performance, cycling stability, and interfacial behavior.
Main Results:
- P-FMA facilitated the formation of a LiF-rich SEI layer with improved mechanical strength and ionic conductivity.
- Li||Li symmetric cells showed stable cycling over 1200 hours.
- Full cells retained 82.2% capacity after 480 cycles, outperforming bare lithium anodes.
Conclusions:
- The luminescent polymer P-FMA effectively functions as an intelligent artificial SEI.
- P-FMA enhances lithium metal anode stability, suppresses dendrite growth, and enables real-time interface monitoring.
- This strategy offers a promising approach for developing high-performance and visually-monitored lithium metal batteries.
