Discharged Na ₅ V ₁₂ O ₃₂ Nanowire Arrays Coated with Cu-Cu ₂ O for High Performance Lithium-Ion Batteries

Sodium vanadate have been widely used as a lithium-ion battery anode. However, its further application is restricted by the capacity attenuation during cycles because of its easy solubility in electrolyte, huge structural change, and low conductivity. Here, a lithium-ion battery electrode based on Cu-Cu 2 O coated Na 5 V 12 O 32 nanowire arrays using a predischarge-electrodeposition method is freported. Remarkably, in the Cu-Cu 2 O@Na 5 V 12 O 32 electrode, the Na 5 V 12 O 32 nanowires function as the skeleton, and Cu-Cu 2 O nanoparticles function as the coating layer. At a specific current of 50 mA g −1 , the composite electrode exhibits discharge and charge capacity of 837 and 821 mAh g −1 after 80 cycles, respectively, which is much higher than that of the Na 5 V 12 O 32 nanowires electrode. This research provides a new pathway to explore electrode materials with enhanced electrochemical performance.

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