Potassium‐ion batteries (PIBs) have been considered as promising alternatives to lithium‐ion batteries in large‐scale energy storage systems owing to the high earth abundance and low cost of potassium resources. However, the large radius of the K ion hinders the development of suitable electrode materials. Herein, with commercial antimony (Sb) and mesoCarbon microbead (MCMB) powders as low‐cost raw materials, a facile ball‐milling strategy is developed for constructing high‐performance Sb−C composite electrodes. The as‐prepared Sb@MCMB‐3 electrode exhibits high reversible capacity (525.4 mAh g⁻¹ at 100 mA g⁻¹), superior rate capability (293.9 mAh g⁻¹ at 5000 mA g⁻¹) and stable cycling performance (497.5 mAh g⁻¹ after 80 cycles at 100 mA g⁻¹ and 300.1 mAh g⁻¹ after 500 cycles at 1.0 A g⁻¹). With consecutive CV measurements, the galvanostatic intermittent titration technique, and Randle‐Sevcik equation, the K‐ion diffusion kinetics are insightfully evaluated. Therefore, this work may broaden the pathways for the commercialization of PIBs.

中文翻译：

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球磨策略实现锑碳复合阳极中钾离子的快速稳定存储

钾离子电池（PIBs）被认为是大型储能系统中锂离子电池的有前途的替代品，这归因于其高的地球丰度和钾资源的低成本。然而，K离子的大半径阻碍了合适的电极材料的发展。在此，以商业锑（Sb）和中观碳微珠（MCMB）粉末为低成本原料，开发了一种用于构造高性能Sb-C复合电极的简便球磨策略。所制备的Sb @ MCMB-3电极表现出高的可逆容量（毫安525.4克^-1在100mA克^-1），优异的倍率性能（293.9毫安克^-1在5000毫安克^-1）和稳定的循环性能（497.5毫安克^-1在100mA克80次循环后^-1和300.1毫安克^-1 1.0 A G 500次循环后^-1）。通过连续的CV测量，恒电流间歇滴定技术和Randle-Sevcik方程，可以深入地评估K离子扩散动力学。因此，这项工作可能会拓宽PIB商业化的途径。