Organic 2,5-dihydroxy-1,4-benzoquinone potassium salt with ultrahigh initial coulombic efficiency for potassium-ion batteries

Abstract

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.