The large size of K‐ion makes the pursuit of stable high‐capacity anodes for K‐ion batteries (KIBs) a formidable challenge, particularly for high temperature KIBs as the electrode instability becomes more aggravated with temperature climbing. Herein, we demonstrate that a hollow ZnS@C nanocomposite (h‐ZnS@C) with a precise shell modulation can resist electrode disintegration to enable stable high‐capacity potassium storage at room and high temperature. Based on a model electrode, we identify an interesting structure‐function correlation of the h‐ZnS@C: with an increase in the shell thickness, the cyclability increases while the rate and capacity decreases, shedding light on the design of high‐performance h‐ZnS@C anodes via engineering the shell thickness. Typically, the h‐ZnS@C anode with a shell thickness of 60 nm can deliver an impressive comprehensive performance at room temperature; the h‐ZnS@C with shell thickness increasing to 75 nm can achieve an extraordinary stability (88.6% capacity retention over 450 cycles) with a high capacity (450 mAh g‐1) and a superb rate even at an extreme temperature of 60 ℃, which is much superior than those reported anodes. This contribution envisions new perspectives on rational design of functional metal sulfides composite toward high‐performance KIBs with insights into the significant structure‐function correlation.

中文翻译：

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空心金属硫化物纳米复合材料的壳调制用于室温和高温稳定钾储存

钾离子的大尺寸使得追求钾离子电池（KIB）稳定的高容量阳极成为一项艰巨的挑战，特别是对于高温KIB，因为随着温度的升高，电极的不稳定性变得更加严重。在此，我们证明了具有精确壳层调制的中空 ZnS@C 纳米复合材料（h-ZnS@C）可以抵抗电极崩解，从而在室温和高温下实现稳定的高容量钾存储。基于模型电极，我们确定了 h-ZnS@C 的一个有趣的结构-功能相关性：随着壳厚度的增加，循环能力增加，而倍率和容量下降，这为高性能 h-ZnS@C 的设计提供了线索。 ‐ZnS@C 阳极通过设计壳厚度。通常，壳厚度为60 nm的h-ZnS@C阳极可以在室温下提供令人印象深刻的综合性能；壳厚度增加至75 nm的h-ZnS@C即使在60℃的极端温度下也能实现非凡的稳定性（450次循环后容量保持率为88.6%）、高容量（450 mAh g-1）和极好的倍率，这比报道的阳极要优越得多。这项贡献为高性能 KIB 的功能性金属硫化物复合材料的合理设计提供了新的视角，并深入了解了显着的结构-功能相关性。