Hollow-Sphere-Structured\nNa<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(P<sub>2</sub>O<sub>7</sub>)/C as a Cathode\nMaterial for Sodium-Ion Batteries
Li-ming Zhang (3807292)Xiao-dong He (3117864)Shuo Wang (143908)Nai-qing Ren (10879745)Jun-ru Wang (7479374)Jie-min Dong (9137721)Fei Chen (13690)Yi-xuan Li (1437247)Zhao-yin Wen (10879748)Chun-hua Chen (9137724)
Abstract
The\nmixed polyanionic material Na<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(P<sub>2</sub>O<sub>7</sub>) combines the advantages\nof NaFePO<sub>4</sub> and Na<sub>2</sub>FeP<sub>2</sub>O<sub>7</sub> in capacity, stability, and cost. Herein, we synthesized carbon-coated\nhollow-sphere-structured Na<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(P<sub>2</sub>O<sub>7</sub>) powders by a scalable spray\ndrying route. The optimal sample can deliver a high discharge capacity\nof 107.7 mA h g<sup>–1</sup> at 0.2C. It also delivers a capacity\nof 88 mA h g<sup>–1</sup> at 10C and a capacity of retention\nof 92% after 1500 cycles. Ex situ X-ray diffraction analysis indicates\na slight volume change (less than 3%) in the Na<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(P<sub>2</sub>O<sub>7</sub>) lattice\ncell. Therefore, such a spraying-derived carbon-coated Na<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(P<sub>2</sub>O<sub>7</sub>) powder is a very attractive cathode electrode for sodium-ion batteries.
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