Hollow-Sphere-Structured Na4Fe3(PO4)2(P2O7)/C as a Cathode Material for Sodium-Ion Batteries

The mixed polyanionic material Na4Fe3(PO4)2(P2O7) combines the advantages of NaFePO4 and Na2FeP2O7 in capacity, stability, and cost. Herein, we synthesized carbon-coated hollow-sphere-structured Na4Fe3(PO4)2(P2O7) powders by a scalable spray drying route. The optimal sample can deliver a high discha...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2021-06, Vol.13 (22), p.25972-25980
Main Authors: Zhang, Li-ming, He, Xiao-dong, Wang, Shuo, Ren, Nai-qing, Wang, Jun-ru, Dong, Jie-min, Chen, Fei, Li, Yi-xuan, Wen, Zhao-yin, Chen, Chun-hua
Format: Article
Language:English
Subjects:
Energy, Environmental, and Catalysis Applications
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Summary:The mixed polyanionic material Na4Fe3(PO4)2(P2O7) combines the advantages of NaFePO4 and Na2FeP2O7 in capacity, stability, and cost. Herein, we synthesized carbon-coated hollow-sphere-structured Na4Fe3(PO4)2(P2O7) powders by a scalable spray drying route. The optimal sample can deliver a high discharge capacity of 107.7 mA h g–1 at 0.2C. It also delivers a capacity of 88 mA h g–1 at 10C and a capacity of retention of 92% after 1500 cycles. Ex situ X-ray diffraction analysis indicates a slight volume change (less than 3%) in the Na4Fe3(PO4)2(P2O7) lattice cell. Therefore, such a spraying-derived carbon-coated Na4Fe3(PO4)2(P2O7) powder is a very attractive cathode electrode for sodium-ion batteries.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.1c04035