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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Bridging Donor Ligands Enable an Ultrastable Graphite Anode for Sodium-Ion Batteries
Bingyan Song1, Zhifen Luo1, Xi Liu1
1Confucius Energy Storage Lab, School of Energy and Environment & Z Energy Storage Center, Southeast University, Nanjing, Jiangsu, 211189, China.
Angewandte Chemie (International Ed. in English)
|July 30, 2025
Summary
Researchers developed bridging-donor-ligands to enhance graphite anodes for sodium-ion batteries (SIBs). This method improves structural stability and cycling performance, enabling long-lasting and efficient energy storage solutions.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Graphite is a common anode in lithium-ion batteries due to its stability and cost.
- Graphite's limited intercalation properties hinder its use in sodium-ion batteries (SIBs).
Purpose of the Study:
- To enhance graphite anode performance in SIBs.
- To overcome the limitations of sodium ion intercalation in graphite structures.
Main Methods:
- Introduced bridging-donor-ligands to create ligand channels.
- Expanded graphite interlayer spacing using sodium dicyandiamide (NaDCA) as a model ligand.
- Investigated the structural robustness of ternary graphite intercalation compounds (t-GICs).
Main Results:
- Demonstrated the formation of abundant ligand channels facilitated by the dicyanamide anion (DCA-).
- Achieved over 94% capacity retention after 5000 cycles in SIBs.
- Maintained an average Coulombic efficiency (CE) exceeding 99.8%.
Conclusions:
- The bridging-donor-ligand strategy significantly enhances graphite anode structural integrity for SIBs.
- This versatile mechanism shows potential for application in other metal-ion battery electrolytes.
- The developed method offers a promising pathway for high-performance and durable sodium-ion batteries.
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