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Spatially Selective Substitution for Structural Stabilization of Sodium Layered Oxide Cathodes
Hai-Yan Hu1,2,3,4, Minwen Yang5, Diancheng Chen5
1College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P.R. China.
Angewandte Chemie (International Ed. in English)
|November 10, 2025
Summary
This study enhances sodium-ion battery cathodes using multi-element substitution to improve structural stability and durability. The new materials show excellent performance, paving the way for advanced sodium-ion battery design.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- O3-type layered transition metal oxides are promising for sodium-ion batteries (SIBs) but suffer from structural instability.
- Multiphase transitions during cycling lead to degradation and limit practical application.
Purpose of the Study:
- To enhance the structural robustness of O3-type layered oxides for SIBs.
- To investigate the effect of spatially selective multi-element substitution on electrochemical performance.
Main Methods:
- Spatially selective multi-element substitution with Mg, Cu, Ti, and B.
- Electrochemical cycling in half and full cells.
- Density functional theory (DFT) analysis.
Main Results:
- Optimized composition (NaNi0.4Mg0.05Cu0.05Mn0.3Ti0.2B0.05O2) stabilized the O3 → P3 phase transition.
- Enhanced structural stability by inhibiting interfacial degradation and strengthening the lattice.
- Achieved 85% capacity retention after 300 cycles in full cells at 0.5 C.
Conclusions:
- Spatially differentiated substitution architecture significantly improves structural stability.
- Strong B─O covalency is key for anchoring the P3 framework.
- The strategy provides fundamental insights for designing advanced SIB cathode materials.
