Here, we propose a new organic 2,5-dihydroxy-1,4-benzoquinone potassium salt (K₂C₆H₂O₄) endowing an ultrahigh initial coulombic efficiency of 96% as an advanced anode for potassium-ion batteries. Theoretical calculations and experimental results suggest that K⁺ can reversibly insert into this organic compound due to the flexible and stable structure of the K₂C₆H₂O₄ molecule as well as fast K⁺ kinetics in the selected dimethyl ether-based electrolyte.

中文翻译：

---

具有超高初始库仑效率的有机2,5-二羟基-1,4-苯醌钾盐，用于钾离子电池。

在这里，我们提出了一种新型的有机2,5-二羟基-1,4-苯醌钾盐（K ₂ C ₆ H ₂ O ₄），具有96％的超高初始库仑效率，可作为钾离子电池的高级阳极。理论计算和实验结果表明，由于K ₂ C ₆ H ₂ O ₄分子的柔性和稳定结构以及所选二甲醚基电解质中的快速K ⁺动力学，K ⁺可以可逆地插入该有机化合物。