Potassium-ion (K⁺) batteries (PIBs) show great potential in large-scale energy storage applications owing to their low-cost and high-operating voltage. However, the development of practical PIBs remains hindered by their poor performance rate due to the large ionic radius of the K⁺ (1.38 Å). Herein, we report an ionic-drill strategy using smaller lithium ions (Li⁺) to open diffusion channels for K⁺ in the host electrode and enable much faster kinetics of K-ions. To realize this goal, a K⁺/Li⁺/PF₆⁻ hybrid configuration was rationally designed, and the K-based electrolyte hybridized with 20 atom % Li showed significantly improved diffusion kinetics and discharge capacity. The optimized K⁺-based full battery exhibited excellent rate performance with a specific capacity of 106 mAh g⁻¹ at a current rate of 5 C and maintained 84.7 mAh g⁻¹ up to 25 C. It also showed long-term cycling stability with capacity retention ∼100% over 500 cycles at 5 C. These results are the best known K⁺ full batteries. Thus, this work provides an effective strategy to enhance the electrochemical performance of PIBs for potential practical applications.

钾离子（K ⁺）电池（PI ⁺）由于其低成本和高工作电压，在大规模储能应用中显示出巨大潜力。但是，由于K ^+的离子半径大（1.38Å），因此实际的PIB的开发效率差，仍然阻碍了它们的发展。在本文中，我们报告了一种离子钻孔策略，该方法使用较小的锂离子（Li ⁺）打开主体电极中K ^+的扩散通道，并使K离子动力学更快。为了实现这个目标，K ⁺ / Li ⁺ / PF ₆ ⁻合理设计了杂化构型，与20原子％Li杂化的K基电解质显示出显着改善的扩散动力学和放电容量。经过优化的基于K ⁺的全电池在5 C的电流速率下表现出出色的倍率性能，比容量为106 mAh g ^-1，在高达25 C的温度下仍保持84.7 mAh g ^-1的性能。在5 C下500次循环中，容量保持率〜100％。这些结果是最著名的K ⁺全电池。因此，这项工作提供了一种有效的策略来增强PIB的电化学性能，以用于潜在的实际应用。