Superior high-rate and cycle performances of a single-phase ferrous orthophosphate Na1.2Fe4(PO4)3 anode material for lithium-ion batteries

• Published in: Journal of power sources 2022-07, Vol.535, p.231447, Article 231447
• Main Authors: Ge, Yilin, Li, Yushan, Wang, Feng, Tan, Xiaoqin, Liu, Peng, Wang, Dianhui, Zhou, Wentong, Yao, Qingrong, Balogun (Jie Tang), M.-Sadeeq, Huang, Dan, Deng, Jianqiu
• Format: Article
• Language: English
• Subjects: Anode; Cycling stability; High-rate performance; Lithium-ion batteries; Na1.2Fe4(PO4)3; Sodium-ion batteries
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2022.231447

The development of low-cost and eco-friendly electrode materials is crucial for the next-generation rechargeable lithium-ion batteries (LIBs). Herein, the single-phase Na1.2Fe4(PO4)3 (NFP) with a monoclinic NaCo4(PO4)3-type structure is demonstrated to be a suitable anode material for LIBs. The NFP anode exhibits superior high-rate performance, releasing an initial charge capacity of 128.6 mAh g−1 at 10C and a high-capacity retention rate of 86.7% over 1500 cycles. The prominent rate performance and cycling stability of the NFP anode are attributed to the stable single-phase crystal structure and fast Li-ion diffusion verified by galvanostatic intermittent titration technique (GITT). Furthermore, the structure evolution and Li-ion diffusion pathway of the NFP anode are clarified by ex-situ X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and first-principles calculations. •The low-cost and eco-friendly Na1.2Fe4(PO4)3 as an anode for LIBs is developed.•Na1.2Fe4(PO4)3 exhibits superior electrochemical performance.•Na1.2Fe4(PO4)3 shows a capacity retention of 86.7% after 1500 cycles at 10C.•The lithium storage mechanism in the Na1.2Fe4(PO4)3 anode is clarified.