A new sodium ferrous orthophosphate Na (x) Fe-4(PO4)(3) as anode materials for sodium-ion batteries

作者：Zhang, Hui; Zhao, Yanming^*; Wen, Mingming; Dong, Youzhong; Fan, Qinghua; Kuang, Quan; Liu, Huatao; Lian, Xin

来源：Journal of Materials Science, 2018, 53(11): 8385-8397.

DOI：10.1007/s10853-018-2128-4

• CATHODE MATERIAL
• STORAGE
• CARBON
• LITHIUM
• EXPLORATION
• CHALLENGES
• GLASSES
• RAMAN
• IR

A new sodium ferrous orthophosphate Na (x) Fe-4(PO4)(3) (1.1 a x a 1.2) with P2(1)/n 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 direction and three- or four-sided tunnels running along 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.

• 出版日期2018-6
• 单位华南理工大学