SrV4O9 microflowers as high performance cathode for aqueous zinc-ion battery

• SrV 4 O 9 microflower was used as cathode material for ZIBs. • The phase transformation to amorphous pattern is an effective way to improve the performance. • The capacity retention rate reaches 91% after 2000 cycles at 5 A g −1 . Zinc-ion batteries have shown great prospects with their unique advantages of cheap cost and high safety. However, poor cycling stability and slowly ion diffusion kinetics of the cathode limit the development of zinc ion battery for further application. Herein, SrV 4 O 9 (SrVO) microflowers were achieved by the hydrothermal method. The SrVO would deliver phase transformation to form amorphous phase, which is an effective way to improve the performance. Strikingly, the cathode provides a capacity of 363 mAh g −1 at 0.1 A g −1 . The capacity retention rate reaches 91% after 2000 cycles at 5 A g −1 . The SrVO electrode exhibits high specific capacity and good cycling stability due to their unique phase transformation.