Potassium-ion batteries are attracting great attention as a promising alternative to lithium-ion batteries due to the abundance and low price of potassium. Herein, the phosphorus/carbon composite, obtained by a simple ball-milling of 20 wt% commercial red phosphorus and 80 wt% graphite, is studied as a novel anode for potassium-ion batteries. Considering the high theoretical specific capacity of phosphorus and formation of stable phosphorus-carbon bond, which can alleviate the volume expansion efficiently, the phosphorus/carbon composite exhibits a high charge capacity of 323.5 mA h g⁻¹ after 50 cycles at a current density of 50 mA g⁻¹ with moderate rate capability and cycling stability. By the X-ray diffraction analysis, the alloying–dealloying mechanism of phosphorus is proposed to form a KP phase. Meanwhile, prepotassiation treatment is conducted to improve the low initial coulomb efficiency.

由于钾的丰富和低廉的价格，钾离子电池作为锂离子电池的有前途的替代品正引起人们的广泛关注。在此，研究了通过简单的球磨20重量％的商业红磷和80重量％的石墨获得的磷/碳复合物，作为钾离子电池的新型阳极。考虑到磷的高理论比容量和稳定的磷-碳键的形成（可以有效缓解体积膨胀），磷/碳复合材料在50次循环，电流密度为50时表现出323.5 mA h g ^-1的高充电容量mA g ^-1具有适中的速率能力和循环稳定性。通过X射线衍射分析，提出了磷的合金化-脱合金机理以形成KP相。同时，进行前锅辅助治疗以改善低的初始库仑效率。