The development of an efficient metal sulfide cathode is of great importance and an ongoing challenge for the practical application of an aqueous rechargeable Ni-Zn battery. Herein, Ni 3 S 2 nanosheets with abundant sulfur vacancies (r-Ni 3 S 2 ) have been successfully prepared via hydrothermal reaction and surface engineering, which are further employed as the binder-free cathode of the aqueous Ni-Zn battery. Benefitting from the features of substantially improved electrical conductivity, low band gap, abundant active sites, and good intrinsic capacity, the r-Ni 3 S 2 electrode delivers an impressive reversible specific capacitance (1621.6 F g −1 at 0.2 A g −1 ) and extraordinary rate capability (62.1% retention under 8 A g −1 ). Moreover, the aqueous rechargeable r-Ni 3 S 2 //Zn battery exhibits a remarkable specific capacity (240.8 mAh g −1 at 1 A g −1 ) and preeminent cycling durability (only 8.4% decay after 3000 cycles). Besides, a glorious energy density of 419.6 Wh kg −1 together with a peak power density of 1.84 kW kg −1 could be achieved, surpassing a significant percentage of the reported Ni-Zn batteries. The results reveal that the r-Ni 3 S 2 cathode with abundant sulfur vacancies and the adopted facile approach possesses huge promotion potential for Ni-Zn batteries and is promising to numerous electronics and electric vehicle applications in the future.

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