Rechargeable aqueous zinc-ion batteries (RZIBs) have attracted wide attention due to their advantages of high safety, low cost, low toxicity, and high energy density of the zinc anode. However, due to low discharge current, low specific energy density, poor cycle stability, and other factors, the development of aqueous zinc-ion batteries is limited. Herein, we report the synthesis of high-stability vanadium nitride (VN) particles by reduction and nitrification of V 2 O 5 in an NH 3 atmosphere. At a current density of 0.1 A g −1 , VN particles have a specific capacity of 496 mAh g −1 , benefiting from their tiny particle size and porous, stacked structure. Even at a current density of 20 A g −1 , the capacity after activation is 153 mAh g −1 , and after 8000 stable cycles, they still have a capacity of 82 mAh g −1 . VN particles can provide a high power density of 305 Wh kg −1 at a power density of 393 W kg −1 . The results show that VN particles are a promising ZIB cathode material and provide an idea for the study of ZIB cathode materials with high energy density and high cycling stability.
Rechargeable
aqueous zinc ion batteries (ZIBs) have been researched
widely because of some special strengths of high safety, low cost,
and high energy density. Nevertheless, aqueous zinc ion batteries
still face imperfections such as low discharge voltage and poor cycling
stability. Therefore, the synthesis of high-performance carbon-coated
VN by reduction and nitrification of V2O5 in
an NH3 atmosphere is proposed. The cathode material of
carbon-doped VN (coral VN/C) has a specific capacity of 322 mAh g–1 at a current density of 0.5 A g–1, which benefit from the nanoscale size and porous, stacked structure.
Furthermore, the battery maintains a specific capacity of 111 mAh
g–1 and a capacity retention rate of 95% at a high
current density of 15 A g–1 after 6780 cycles. These
results prove that coral VN/C is a new excellent ZIB cathode material,
which exhibits a high energy density and high cycle stability for
the ZIB cathode material, and propose an excellent coral VN/C synthesis
method.
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