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- Title
A new sodium ferrous orthophosphate Na<sub><italic>x</italic></sub>Fe<sub>4</sub>(PO<sub>4</sub>)<sub>3</sub> as anode materials for sodium-ion batteries.
- Authors
Zhang, Hui; Zhao, Yanming; Wen, Mingming; Dong, Youzhong; Fan, Qinghua; Kuang, Quan; Liu, Huatao; Lian, Xin
- Abstract
A new sodium ferrous orthophosphate Na<italic>x</italic>Fe4(PO4)3 (1.1 ≤ <italic>x</italic> ≤ 1.2) with <italic>P</italic>21/<italic>n</italic> symmetry has been successfully synthesized via a solid-state reaction for the first time. The structure consists of FeO5 pyramids, FeO6 octahedron, and PO4 tetrahedra which form large six-sided tunnels along b→<inline-graphic></inline-graphic> direction and three- or four-sided tunnels running along a→<inline-graphic></inline-graphic> direction. When evaluated as the anode materials for sodium-ion batteries, the first discharge and charge capacities of 553 and 264 mAh g−1 for Na1.1Fe4(PO4)3/C and 583 and 315 mAh g−1 for Na1.2Fe4(PO4)3/C, respectively, can be obtained at 10 mA g−1 current density. Compared to the Na1.1Fe4(PO4)3/C, Na1.2Fe4(PO4)3/C exhibits a better cycling performance, where the charge capacity of about 100 mAh g−1 can still be maintained after 15 cycles. The electrode kinetics are investigated further by the electrochemical impedance spectroscopy.
- Subjects
ORTHOPHOSPHATES; SOLID state chemistry; IRON oxides; SODIUM ions; STORAGE batteries; ELECTRODES; IMPEDANCE spectroscopy; ANODES
- Publication
Journal of Materials Science, 2018, Vol 53, Issue 11, p8385
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-018-2128-4