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Synthesized From FeVO4 Precursor and Al2O3 Modified Cathode Material Na4FeV(PO4)3 for Sodium Ion Batteries
Zhe Liu1, Yujing Chen1, Peiyao Li1
1School of Metallurgy and Environment, Central South University, Changsha, Hunan, China.
Chemsuschem
|July 29, 2026
Summary
This study introduces a new synthesis method for high-purity sodium iron vanadium phosphate (NFVP) cathodes, improving sodium-ion battery performance. An aluminum oxide coating enhances stability and electrochemical properties for high-voltage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium iron vanadium phosphate (Na4FeV(PO4)3, NFVP) is a promising NASICON-type cathode material for sodium-ion batteries due to its open framework and high theoretical capacity.
- Current synthesis methods often yield impurity phases, and the V5+ species is prone to electrolyte reactions at high voltages, leading to poor electrochemical performance and structural instability.
- Addressing these challenges is crucial for unlocking the potential of NFVP in high-voltage sodium-ion battery applications.
Purpose of the Study:
- To develop a precursor-based synthesis approach for high-purity NFVP.
- To improve the high-voltage electrochemical performance and stability of NFVP cathodes.
- To investigate the efficacy of an Al2O3 protective coating in mitigating side reactions and enhancing structural integrity.
Main Methods:
- A precursor-based synthesis strategy was employed to produce high-purity Na4FeV(PO4)3 (NFVP).
- An Al2O3 protective layer was coated onto the NFVP material surface.
- Electrochemical performance, including cycling stability and rate capability, was evaluated in the 2.0-4.3 V voltage range.
Main Results:
- The modified NFVP cathode exhibited significantly enhanced cycling stability, with capacity retention increasing from 46.4% to 70% after 200 cycles at 1 C.
- The specific discharge capacity at 20 C improved from 17.4 to 53.9 mAh g-1, demonstrating enhanced rate capability.
- The Al2O3 coating effectively suppressed side reactions between the V5+ species and the electrolyte, improving structural stability.
Conclusions:
- The precursor-based synthesis combined with an Al2O3 coating is a viable strategy for producing high-performance NFVP cathodes.
- This approach effectively addresses impurity formation and V5+-electrolyte side reactions, leading to improved cycling stability and rate capability.
- The findings offer a promising pathway for advancing NASICON-type cathodes for practical high-voltage sodium-ion battery applications.
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