Metal sulfides with multi-shelled hollow structures are promising electrode materials for rechargeable alkaline batteries due to their abundant redox centers and electrochemically active sites. We designed and synthesized a high-performance electrode material of sulfide-rich metal sulfides with nanostructured multi-shelled hollow spheres. Using multi-shelled NiO hollow spheres as precursors, three types of nickel sulfide (Ni₃S₂, NiS, NiS₂) with controlled valence were obtained by controlling the sulfurization conditions. When applied as electrode materials for rechargeable alkaline batteries, multi-shelled nickel sulfide hollow spheres exhibit excellent electrochemical performance. Interestingly, the hollow spheres with more shells deliver better performance than those hollow spheres with fewer shells, owing to their greater number of faradaic active sites, shorter diffusion path and better electrochemical stability. The quadruple-shelled NiS₂ hollow spheres show a high specific capacity (216 mA h g⁻¹ at 5 A g⁻¹) and outstanding cycling performance (89.96% retention after 5000 cycles).

中文翻译：

---

形成可充电碱性电池的多壳镍基硫化物空心球†

具有多壳中空结构的金属硫化物由于其丰富的氧化还原中心和电化学活性位点，成为可再充电碱性电池的有前途的电极材料。我们设计并合成了具有纳米结构的多壳空心球的富含硫化物的金属硫化物的高性能电极材料。使用多壳NiO空心球作为前体，制备三种类型的硫化镍（Ni ₃ S ₂，NiS，NiS ₂通过控制硫化条件可得到价态可控的）。当用作可充电碱性电池的电极材料时，多壳硫化镍空心球表现出出色的电化学性能。有趣的是，具有更多壳的空心球比具有更少壳的空心球具有更好的性能，这是由于它们具有更多的法拉第活性位点，更短的扩散路径和更好的电化学稳定性。四倍去壳的NiS ₂空心球显示出高的比容量（216毫安汞柱^-1在5 A G ^-1）和出色的循环性能（5000次循环后89.96％的保留）。