The introduction of heterostructure in the cathode material of Li-S battery is an effective method to improve the redox reaction kinetics and suppress the shuttle effect of polysulfide. A metal sulfide/metal selenide (NiS/NiSe) heterostructure with hollow tetrahedral structure is prepared as a sulfur host of lithium-sulfur batteries. The prepared NiS/NiSe heterostructure exhibits efficient charge transfer at the heterojunction interface, thereby enhancing catalytic activity for redox reactions of polysulfides and facilitating their rapid conversion. Moreover, the unique hollow tetrahedral structure, along with abundant surface pores, enables high sulfur loading capacity, providing abundant electrochemical reaction sites to enhance sulfur utilization efficiency. The results demonstrate that the NiS/NiSe heterostructure material exhibits a remarkable initial capacity of 1338.9 mAh/g at 0.2 C, along with exceptional cycling stability (maintaining a capacity of 517.6 mAh/g after 200 cycles at 0.2 C, with only a negligible decay rate of 0.3% per cycle, retaining a capacity of 462.6 mAh/g after 500 cycles at 1 C, with an insignificant decay rate of merely 0.12% per cycle). The facile preparation of this NiS/NiSe heterostructure not only enables the realization of lithium-sulfur batteries with exceptional capacity, but also opens up broader avenues for exploring high-performance heterogeneous materials.

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NiS2/NiSe2异质结构的制备及其在锂硫电池硫主体中的应用

在Li-S电池正极材料中引入异质结构是改善氧化还原反应动力学、抑制多硫化物穿梭效应的有效方法。制备了具有空心四面体结构的金属硫化物/金属硒化物（NiS/NiSe）异质结构作为锂硫电池的硫主体。所制备的NiS/NiSe异质结构在异质结界面表现出有效的电荷转移，从而增强多硫化物氧化还原反应的催化活性并促进其快速转化。此外，独特的中空四面体结构以及丰富的表面孔隙，具有较高的硫负载能力，提供丰富的电化学反应位点，提高硫的利用效率。结果表明，NiS/NiSe 异质结构材料在 0.2 C 下表现出 1338.9 mAh/g 的显着初始容量，以及出色的循环稳定性（在 0.2 C 下循环 200 次后容量保持为 517.6 mAh/g，仅存在可忽略不计的衰减）每个循环的衰减率为0.3%，在1 C下循环500次后容量仍保持在462.6 mAh/g，衰减率微不足道，每个循环仅为0.12%）。这种NiS/NiSe异质结构的简便制备不仅能够实现具有优异容量的锂硫电池，而且为探索高性能异质材料开辟了更广阔的途径。