期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 12, 页码 4479-4484出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta00454g
关键词
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资金
- Guangdong Innovation Team Project [2013N080]
- Shenzhen Science and Technology Research Grant (peacock plan) [KYPT20141016105435850]
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 nanocrystals 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).
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