本发明属于镁离子电池电极材料领域，涉及一种二硫化镍电极材料及制备方法和应用。本发明通过简单的一步低温熔盐法，以熔融共晶盐六水合硝酸镍‑NaCl为反应提供液体介质，以六水合硝酸镍和五水合硫代硫酸钠为原料，成功地合成了棉絮状的NiS2。本发明提供的二硫化镍电极材料的制备方法有着成本低、绿色环保、温度低、易于实现规模化工业生产等优点。将NiS2作为正极材料组装成镁电池，通过控制电压窗口并测试其电化学性能，该二硫化镍电极材料展现出了卓越的电化学性能，在100 mA g‑1下的放电容量为261 mAh g‑1，在200 mA g‑1下循环288周后其容量保持率为44%。
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