Carbon-based materials are commonly used as anodes for potassium-ion batteries due to their high conductivity and stable cycling performance. However, their practical application is greatly hindered by their low capacity. Herein, we introduce facile sulfur chemistry including thioether bonds and CoS₂ into a nitrogen-oxygen co-doped partially graphitized carbon skeleton (NOGC), while the extra reconfiguration process of carbon assists forming the CoS₂@R-NOGC composites. The reconfigured NOGC (R-NOGC), enriched with highly electronegative elements (N, O, S), significantly enhances the reversible potassium ion storage capacity. The ordered carbon structure provides more efficient ionic transport pathways, thereby improving K⁺ transport efficiency. Moreover, layered CoS₂ acts as additional ion transport channels and active sites, further enhancing ion mobility and storage capacity. R-NOGC also promotes the reconstruction and repair of the solid electrolyte interface (SEI) layer to form a more robust interface. As a result of the synergistic effect between R-NOGC and CoS₂, it exhibits excellent anode performance, including a high reversible capacity (314.0 mAh/g at 0.1 A/g) and long-term stability (250.3 mAh/g at 0.5 A/g after 1,000 cycles). This work presents a novel strategy for designing and synthesizing high-performance anode materials for potassium-ion batteries, significantly enhancing both capacity and cycling stability.

中文翻译：

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简单的硫化学辅助碳重构，实现高效的钾离子电化学储存


碳基材料由于其高导电性和稳定的循环性能，通常用作钾离子电池的负极。然而，由于容量低，它们的实际应用受到了极大的阻碍。在本文中，我们将包括硫醚键和 CoS₂ 在内的简单硫化学引入氮氧共掺杂的部分石墨化碳骨架 （NOGC） 中，而碳的额外重构过程有助于形成 CoS₂@R-NOGC 复合材料。重新配置的 NOGC （R-NOGC） 富含高电负性元素 （N、O、S），显著提高了可逆钾离子的存储容量。有序碳结构提供了更有效的离子传输途径，从而提高了 K⁺ 传输效率。此外，层状 CoS₂ 可作为额外的离子传输通道和活性位点，进一步增强离子迁移率和储存容量。R-NOGC 还促进固体电解质界面 （SEI） 层的重建和修复，以形成更稳健的界面。由于 R-NOGC 和 CoS₂ 之间的协同效应，它表现出优异的阳极性能，包括高可逆容量（0.1 A/g 时为 314.0 mAh/g）和长期稳定性（1,000 次循环后 0.5 A/g 时为 250.3 mAh/g）。这项工作提出了一种设计和合成钾离子电池高性能负极材料的新策略，显著提高了容量和循环稳定性。