| Abstract: | The aqueous rechargeable Zn-ion batteries based on the safe, low cost and environmental benignity aqueous electrolytes are one of the most compelling candidates for large scale energy storage applications.However, pursuing suitable insertion materials may be a great challenge due to the strong electrostatic interaction between Zn~(2+) and cathode materials. Hence, a novel NaV_6O_(15)/V_2O_5 skin-core heterostructure nanowire is reported via a one-step hydrothermal method and subsequent calcination for high-stable aqueous Zn-ion batteries(ZIBs). The NaV_6O_(15)/V_2O_5 cathode delivers high specific capacity of 390 m Ah/g at 0.3 A/g and outstanding cycling stability of 267 m Ah/g at 5 A/g with high capacity retention over 92.3% after 3000 cycles. The superior electrochemical performances are attributed to the synergistic effect of skin-core heterostructured NaV_6O_(15)/V_2O_5, in which the sheath of NaV_6O_(15) possesses high stability and conductivity, and the V_2O_5 endows high specific capacity. Besides, the heterojunction structure not only accelerates intercalation kinetics of Zn~(2+) transport but also further consolidates the stability of the layers of V_2O_5 during the cyclic process. This work provides a new perspective in developing feasible insertion materials for rechargeable aqueous ZIBs. |
