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Conjugated C≡C Linked Organic Polymers With Thiadiazole-Induced Electron-Ion Decoupling Toward Long-Life Lithium
Songling Wu1, Hao Li1, Yiwen Sun1
1Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, People's Republic of China.
Angewandte Chemie (International Ed. in English)
|April 14, 2026
Summary
A novel conjugated polymer stabilizes lithium-metal battery anodes by preventing side reactions and enhancing ion transport. This improves battery safety and cycle life, crucial for next-generation energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Lithium-metal batteries (LMBs) face safety hazards due to high lithium-ion (Li+) reactivity and electrolyte side reactions.
- Stabilizing the lithium-metal anode interface is critical for improving LMB safety and performance.
Purpose of the Study:
- To design and synthesize a unique conjugated organic polymer (Alkynyl-COP-TD) for stabilizing the lithium-metal anode interface.
- To investigate the polymer's electron-ion decoupling effect and its impact on Li+ diffusion and deposition kinetics.
Main Methods:
- Synthesis of a conjugated organic polymer (Alkynyl-COP-TD) featuring carbon-carbon triple bonds and thiadiazole units.
- Molecular design to tune the polymer's bandgap for accelerated electron transport and electronic shielding.
- Advanced in-situ/ex-situ characterizations to analyze interfacial properties and ion transport mechanisms.
Main Results:
- Alkynyl-COP-TD forms an effective 'electronic shielding layer', enhancing interfacial mechanical stability and preventing electrolyte side reactions.
- Thiadiazole units accelerate Li+ diffusion-deposition kinetics and charge transfer at the anode.
- Symmetric cells showed over 2500 hours of cycle life at 5 mA cm-2; full cells maintained stability over 1600 cycles with low capacity degradation.
Conclusions:
- The molecularly designed Alkynyl-COP-TD acts as a multifunctional artificial interfacial layer, significantly enhancing LMB safety and longevity.
- The study provides insights into designing advanced polymer materials for stable lithium-metal anodes.
Keywords:
artificial solid electrolyte interphaseelectron‐ion decouplinglithium metal anodelithophilic sitesthiadiazoleMore Related Videos
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