Multi-heteroatom doped carbon coated Na3 V2 (PO4 )3 derived from ionic liquids

Dalton Transactions : an International Journal of Inorganic Chemistry
Lu-Lu ZhangXue-Lin Yang

Abstract

Multi-heteroatom (N, S and F) doped carbon coated Na3V2(PO4)3(labeled as NVP/C-ILs) derived from an ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM]TF2N) has been successfully fabricated. The as-prepared Na3V2(PO4)3particles are well dispersed and closely coated with a multi-heteroatom (N, S and F) doped carbon layer. As a cathode for sodium-ion batteries, the NVP/C-ILs electrode exhibits high reversible specific capacity (117.5 mA h g-1at 1C), superior rate performance (93.4 mA h g-1at 10C) and excellent cycling stability (∼95% capacity retention ratio at 10C over 1000 cycles). The impressive electrochemical performance of NVP/C-ILs can be attributed to effectively conductive networks for electrons and Na+ions induced by a joint effect of N, S and F doping on carbon. The use of multi-heteroatom doped carbon coated Na3V2(PO4)3provides a facile and effective strategy for the fabrication of high performance electrode materials with low intrinsic electrical conductivity.

References

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