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Quenching-Induced Structural and Electronic Modulations in Layered Fe-Mn-Ni Oxide Cathode for Enhanced Sodium Storage
Fujun Niu1, Xiangpeng Kong2, Huai Chen1
1School of Advanced Energy, Sun Yat-sen University (Shenzhen), Shenzhen, China.
Chemsuschem
|December 4, 2025
Summary
Rapid quenching enhances sodium-ion battery cathode performance. This method improves capacity and structural stability for layered oxide NaFe0.33Mn0.33Ni0.33O2 (FMN) materials, paving the way for better batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Layered oxide NaFe0.33Mn0.33Ni0.33O2 (FMN) is a promising cathode for sodium-ion batteries (SIBs) due to its high capacity and low cost.
- Practical use is limited by poor reversible capacity and cycling stability.
Purpose of the Study:
- To enhance the electrochemical performance of FMN cathode material.
- To investigate the effects of a controlled quenching approach on FMN properties.
Main Methods:
- A controlled quenching method was applied to FMN at a rate of 65°C·min⁻¹.
- Electrochemical performance was evaluated through cycling tests.
- Structural and chemical properties were analyzed to understand performance improvements.
Main Results:
- Quenched FMN delivered an initial discharge capacity of 141 mAh·g⁻¹.
- Capacity retention reached 73.3% after 100 cycles, surpassing naturally cooled samples.
- Quenching induced oxygen vacancies, optimized interlayer sodium content, and stabilized transition metal valences.
Conclusions:
- Controlled quenching significantly improves FMN electrochemical performance for SIBs.
- The enhanced properties are linked to oxygen vacancies, ion transport, and suppressed Jahn-Teller distortions.
- This strategy offers a facile route for developing high-performance SIB cathode materials.
