Joint cationic and anionic redox chemistry in a vanadium oxide cathode for zinc batteries achieving high energy density

• DOI: 10.1002/cey2.577
• Publication Date: 2024-05-28T13:50:53Z
• Authors: Wenfeng Wang; Lu Zhang; Zeang Duan; Ruyue Li; Jiajin Zhao; Longteng Tang; Yiming Sui; Yadi Qi; Shumin Han; Chong Fang; Desong Wang; Xiulei Ji
• Keywords: Cationic polymerization

Abstract Rechargeable aqueous zinc batteries are promising for large‐scale energy storage due to their low cost and high safety; however, density has reached the ceiling based on conventional cathodes with a single cationic redox reaction mechanism. Herein, highly reversible cathode of typical layered vanadium oxide is reported, which operates both couple V 5+ /V 3+ accompanied by Zn 2+ anionic O – /O 2– anion hosting in an deep eutectic solvent electrolyte. The oxygen delivers additional capacity ∼100 mAh g –1 at operating voltage ∼1.80 V, increases ∼36%, endowing system record ∼506 Wh kg . findings highlight new opportunities design high‐energy anions as charge carriers.