Potassium-pillared Na4FeV(PO4)3@C cathode for high-performance sodium-ion batteries
Due to the open 3D framework structure and relative high capacity, the NASICON type Na3V2(PO4)3 has aroused enormous attention as the cathode material for sodium-ion batteries. However, it still suffers from the toxicity and high cost of vanadium elements, coupled with low electronic conductivity. I...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
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| Series: | Electrochemistry Communications |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1388248125000220 |
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| Summary: | Due to the open 3D framework structure and relative high capacity, the NASICON type Na3V2(PO4)3 has aroused enormous attention as the cathode material for sodium-ion batteries. However, it still suffers from the toxicity and high cost of vanadium elements, coupled with low electronic conductivity. In this study, we partially substituted V with the environmentally friendly and cost-effective transition element Fe and doped K into the Na site to fabricate a series of Na4-xKxFeV(PO4)3@C composites using a facile sol-gel method. The structural stability, Na+ mobility and electronic conductivity can significant improved by replacing Na+ with K+ and applying a carbon coating. Consequently, the Na3.9K0.1FeV(PO4)3@C electrode delivers a reversible discharge capacity of 83.85 mAh g−1 at 5C after 3000 cycles, with a capacity retention of 91.7 %. It also exhibits an outstanding rate performance with a specific discharge capacity of 83.88 mAh g−1 even at 20.0C. The kinetic analyses and ex-situ characterizations confirm that a small volume change, the pseudocapacitive- dominated sodium storage behavior and highly reversible redox reaction (Fe2+/3+ and V3+/4+) occur during the electrochemical reaction process. Finally, the optimized K-doped NFVP cathode also demonstrates great potential in practical utilization through the evaluation of electrochemical performance for full cells. |
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| ISSN: | 1388-2481 |