Potassium ion batteries with microparticulate electrodes promise a high volumetric capacity, yet they suffer from poor rate capacity and cyclic stability due to the long K⁺diffusion path and structural collapse upon K⁺ insertion/de-insertion. In this work, a local-expanded MoSSe material with wave structure is successfully constructed in a microparticulate state (labeled as LE-MoSSe). The high curvature design in this wave structure breaks the defect concentration limitation in MoSSe crystal, resulting in an abundance of surface active site with up to 29 % vacancy defects for S and 31 % for Se. Moreover, such a structure can adaptively and efficiently release internal stress during long-term repeated K⁺ insertion/de-insertion. Consequently, the LE-MoSSe material delivers a superior volumetric capacity (854 mAh cm⁻³), a record-high rate capability (19.3 C, ∼3 min), and a long cycle stability (only 0.039 % fading per cycle). This work demonstrates a practical approach to accelerate reaction kinetics and enhance structural stability of TMDs toward practical battery systems.

具有微粒电极的钾离子电池具有高体积容量，但由于K⁺扩散路径长以及K⁺插入/脱出时的结构塌陷，其倍率容量和循环稳定性较差在这项工作中，成功构建了一种具有波结构的局部膨胀MoSSe材料（标记为LE-MoSSe）。这种波形结构中的高曲率设计打破了MoSSe晶体中缺陷浓度的限制，从而产生丰富的表面活性位点，其中S的空位缺陷高达29%，Se的空位缺陷高达31%。而且，这种结构可以在长期重复的K⁺插入/脱插过程中自适应且有效地释放内应力。因此，LE-MoSSe材料具有卓越的体积容量（854 mAh cm^-3）、创纪录的高倍率性能（19.3 C，〜3分钟）和长循环稳定性（每个循环仅衰减0.039％）。这项工作展示了一种加速反应动力学并增强 TMD 结构稳定性的实用方法，以实现实际的电池系统。