▎ 摘　　要

NOVELTY - Modified zinc cathode, comprises a zinc foil layer with the thickness of 20-100 µm, and nitrogen and sulfur double-doped graphene oxide layer which is coated on zinc foil layer, and the nitrogen and sulfur double-doped graphene oxide layer has a thickness of 10-50 µm. USE - The modified zinc cathode is useful in energy storage device (claimed), i.e. aqueous zinc ion battery. Can also be used for a lithium ion battery. ADVANTAGE - The modified zinc cathode has good conductivity and zinc affinity, provides lot of adsorption sites for zinc (II), and uniform electric field distribution. The three-dimensional porous structure of NSG layer has good volume change buffer capacity in the zinc stripping/deposition process and these together promote the fast and uniform deposition of zinc, effectively inhibits the growth of secondary reaction and zinc dendritic crystal, and improves the cycle life of the zinc ion battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a preparation method of modified zinc cathode; and an energy storage device.