| Summary: | Transition metal organic framework materials and their selenides are considered to be one of the most promising cathode materials for nickel-zinc (denoted as Ni-Zn) batteries due to their low cost, environmental friendliness, and controllable microstructure. Yet, their low capacity and poor cycling performance severely restricts their further development. Herein, we developed a simple one-pot hydrothermal process to directly synthesize NiSe<sub>2</sub> (denotes as NiSe<sub>2</sub>-X based on the molar amount of SeO<sub>2</sub> added) stacked layered sheets. Benefiting from the peculiar architectures, the fabricated NiSe<sub>2</sub>−1//Zn battery based on NiSe<sub>2</sub> and the Zn plate exhibits a high specific capacity of 231.6 mAh g<sup>−1</sup> at 1 A g<sup>−1</sup>, and excellent rate performance (162.8 mAh g<sup>−1</sup> at 10 A g<sup>−1</sup>). In addition, the NiSe<sub>2</sub>//Zn battery also presents a satisfactory cycle life at the high current density of 8 A g<sup>−1</sup> (almost no decay compared to the initial specific capacity after 1000 cycles). Additionally, the battery device also exhibits a satisfactory energy density of 343.2 Wh kg<sup>−1</sup> and a peak power density of 11.7 kW kg<sup>−1</sup>. This work provides a simple attempt to design a high-performance layered cathode material for aqueous Ni-Zn batteries.
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