Journal
JOURNAL OF POWER SOURCES
Volume 461, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228130
Keywords
Iron-based phosphate; Cathode material; Hard carbon; Anode material; Multi-walled carbon nanotubes; Sodium-ion batteries
Funding
- Science and Technology Commission of Shanghai Municipality [19DZ2271100]
- National Key Research and Development Program of China [2016YFB0901500]
- China postdoctoral science foundation [2019M661339]
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An iron-base phosphate Na4Fe3(PO4)(2)(P2O7) nano-sphere growing on the multi-walled carbon nanotubes (MCNTs) is scalable synthesized via a convenient spray drying way. The Na4Fe3(PO4)(2)(P2O7)@MCNTs composite as cathode material for sodium-ion battery (SIBs) exhibits a high discharge capacity of 115.7 mA h g( -1) at 0.1 C and an outstanding cycle stability with a with a capacity retention of 95% after 1200th at 2 C rate. It also shows an excellent rate capability with a capacity of 62.8 mA h g(-1), even at high rate of 20 C. The outstanding electrochemical performance of Na4Fe3(PO4)(2)(P2O7)@MCNTs cathode are attributed to its' particular P2O7 dimers for reducing the rotation/distortion and higher electronic conductivity improves by MCNTs. A sodium-ion battery using the Na4Fe3(PO4)(2)(P2O7)@MCNTs cathode and the hard carbon anode shows a working voltage of 3.04 V with a specific energy of 210 Wh Kg(-1) bases on the total weight of both electrode materials. [GRAPHICS] .
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