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Boosting the Sodium Storage Performance of O3-Type Layered Oxide Cathode by Dual-Site Doping
Shuo Shi1, Qian Yang1, Simi Sui1
1Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China.
Nano Letters
|June 11, 2025
Summary
Calcium and Tin dual-site doping enhances O3-type layered oxide cathode materials for sodium-ion batteries (SIBs). This strategy improves kinetics, structural stability, and cycling performance for better sodium storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- O3-type layered oxides are promising cathode materials for sodium-ion batteries (SIBs) due to their high sodium content.
- These materials often exhibit poor electrochemical kinetics, irreversible phase transitions, and structural degradation, limiting their performance in SIBs.
- Existing challenges include unsatisfactory sodium storage capacity and poor cycling stability.
Purpose of the Study:
- To enhance the electrochemical performance of O3-type layered oxide cathode materials for SIBs.
- To investigate the effectiveness of a Calcium (Ca) and Tin (Sn) dual-site doping strategy.
- To improve structural stability, reaction kinetics, and cycling life of the cathode material.
Main Methods:
- A Ca/Sn dual-site doping strategy was employed on O3-type layered oxide cathode materials.
- The modified material, Na0.98Ca0.01Ni0.33Fe0.33Mn0.315Sn0.015O2, was synthesized and characterized.
- Electrochemical performance, including cycling stability and rate capability, was evaluated.
Main Results:
- Ca/Sn dual-site doping modulated the coordination environment and chemical bonds of transition metal (TM) ions.
- This resulted in significantly faster charge transfer kinetics and highly reversible phase transitions with minimal volume change.
- The doped material exhibited improved structural stability, suppressed TM dissolution, and maintained particle integrity during cycling, leading to superior cycling stability and excellent rate performance.
Conclusions:
- Ca/Sn dual-site doping is a critical strategy for enhancing the sodium storage performance of O3-type layered oxide cathode materials.
- The synergistic doping effect boosts electrochemical kinetics and structural integrity, overcoming limitations of undoped materials.
- This research provides valuable guidance for designing high-performance cathode materials for advanced sodium-ion batteries.
