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Endogenous Template-Directed Topological Engineering of Lignite-Derived Hard Carbons for Kinetically Accelerated
Shiyue Li1, Hongting Yin1, Zhiwei Xing1
1School of Chemical & Environmental Engineering, China University of Mining & Technology, Beijing, 100083, P. R. China.
Angewandte Chemie (International Ed. in English)
|October 14, 2025
Summary
Researchers developed a novel method using coal to create hard carbon anodes for sodium-ion batteries (SIBs). This approach enhances closed-pore structures, significantly improving sodium storage capacity and stability.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Coal is a viable precursor for hard carbon anodes in sodium-ion batteries (SIBs).
- Graphitization and π-π interactions in coal-derived carbons limit interlayer spacing and performance.
- Optimizing hard carbon structure is crucial for advanced SIBs.
Purpose of the Study:
- To develop a self-templating strategy for coal-based hard carbon.
- To engineer closed-pore structures at the molecular level for enhanced sodium storage.
- To investigate the role of functional groups in improving hard carbon properties.
Main Methods:
- Utilized a self-templating strategy during carbonization of coal.
- Introduced hydroxyl (-OH) and carbonyl (C═O) groups to control pore structure and graphitization.
- Investigated surface functional remodeling for hybrid organic-inorganic solid electrolyte interphase (SEI) formation.
- Tested coal-based hard carbon as an anode in sodium-ion batteries.
Main Results:
- Achieved a high reversible capacity of 350 mAh g-1 at 50 mA g-1.
- Demonstrated excellent cycling stability with 88% capacity retention after 8000 cycles at 5 A g-1.
- Confirmed the formation of closed-pore structures and hybrid organic-inorganic SEI.
- Full batteries with NVP cathode showed stable cycling performance.
Conclusions:
- The self-templating strategy effectively regulates closed-pore structures in coal-based hard carbons.
- Carbonyl groups play a key role in preventing graphitization and enhancing sodium storage.
- This method offers a promising route for developing high-performance hard carbon anodes for SIBs.
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