2D amorphous iron phosphate nanosheets with high rate capability and ultra-long cycle life for sodium ion batteries. Issue 12 (3rd March 2016)

• Record Type: Journal Article
• Authors: Liu, Tongchao; Duan, Yandong; Zhang, Guangxing; Li, Maofan; Feng, Yancong; Hu, Jiangtao; Zheng, Jiaxin; Chen, Jitao; Pan, Feng
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 12(2016)
• Page Start: 4479
• Page End: 4484
• Publication Date: 2016-03-03
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta00454g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : 2D amorphous iron phosphate nanosheet coated carbon exhibits high rate capability and ultra-long cycle life for sodium ion batteries. Abstract : In our previous work, we reported the formation and mechanism of mono/bi-layer phosphate-based materials and their high performance as cathode materials for Li-ion batteries. In this work, we report that 2D amorphous nanosheets can be used as cathode materials to achieve outstanding performance for sodium ion batteries (SIBs) e.g. a high initial discharge capacity of 168.9 mA h g −1 at 0.1C, ultra-long life (92.3% capacity retention over 1000 cycles), and high rate capability (77 mA h g −1 at 10C) for Na-ion storage, whose electrochemical performance is also much superior to the reported amorphous FePO4 or olivine NaFePO4 with advantages of short paths and larger implantation surface areas for fast Na-ion diffusion and large specific surfaces with more interfacial capacitance. Interestingly, NaFePO4 nano-crystals with about 10 nm sizes are self-nucleated from amorphous 2D nanosheets in the charge/discharge process, which was verified by transmission electron microscopy (TEM) and in situ electrochemical impedance spectroscopy (EIS).