Electrochemical insertion/deinsertion of sodium on NaV_6O_(15) nanorods as cathode material of rechargeable sodium-based batteries

摘要

A well defined nano-structured material, NaV_6O_(15) nanorods, was synthesized by a facile low temperature hydrothermal method. It can perform well as the cathode material of rechargeable sodium batteries. It was found that the NaV_6O_(15) nanorods exhibited stable sodium-ion insertion/deinsertion reversibility and delivered 142 mAhg~(-1) sodium ions when worked at a current density of 0.02 Ag~(-1). In galvanostatic cycling test, a specific discharge capacity of around 75 mAh g~(-1) could be obtained after 30 cycles under 0.05 A g~(-1) current density. Concerned to its good electrochemical performance for reversible delivery of sodium ions, it is thus expected that NaV_6O_(15) may be used as cathode material for rechargeable sodium batteries with highly environmental friendship and low cost.