Journal
ENERGY STORAGE MATERIALS
Volume 22, Issue -, Pages 330-336Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2019.02.017
Keywords
Na4Fe3(PO4)(2)P2O7/C nanosphere; Low cost; Cathode material; Sodium-ion battery; High performance
Funding
- National Key Research Program of China [2016YFB0901500]
- National Natural Science Foundation of China [21875171, 21673165, 21333007]
- Science and Technology Project of State Grid [SGRIDGKJ[2017]841]
- Fundamental Research Funds for the Central Universities [2042018kf0007]
- China Postdoctoral Science Foundation [2016M592383, 2017T100574]
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Sodium-ion battery is regarded as a promising power source for large-scale energy storage systems. However, the development of sodium-ion batteries is hindered by the lack of applicable cathode materials with low cost and long cycle life. Here, we report a successful synthesis of Na4Fe3(PO4)(2)P2O7/C nanospheres with tunable particle size and carbon coating thickness by a template approach. The as-prepared Na4Fe3(PO4)(2)P2O7/C nanospheres deliver a high discharge capacity of 128.5 mAh g(-1) (near to the theoretical capacity: 129 mAh g(-1)) at 0.2C, with capacity retention of 63.5% at 10 C after 4000 cycles. Particularly, a high reversible capacity of 79 mAh g(-1) is exhibited at an ultrahigh current rate of 100 C (charge/discharge in 36s). The excellent performances result from the shortened Na+ ion diffusion length within the nanospheres (similar to 30 nm) and highly conductive pathways for electrons in the carbon coating layers (similar to 3 nm). Owing to their low cost, long lifespan and outstanding rate capability, we believe that the Na4Fe3(PO4)(2)P2O7/C nanospheres are considerable competitive to other cathode materials for application in stationary sodium-ion batteries.
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