Cobalt–Nickel Double Hydroxide toward Mild Aqueous Zinc‐Ion Batteries

• DOI: 10.1002/adfm.202204026
• Publication Date: 2022-06-09T07:24:17Z
• Authors: Jianming Meng; Yu Song; Zengming Qin; Zhihui Wang; Xinjian Mu; Jing Wang; Xiao‐Xia Liu
• Keywords: Layered double hydroxides; Zinc hydroxide; Alkaline battery; Metal hydroxide

Abstract Transition metal layered double hydroxides (LDHs) are widely used as high‐performance cathode materials for aqueous alkaline zinc (Zn) batteries. Yet, the strongly electrolytes may lead to undesirable rechargeability of devices and environmental issues. Herein, a research prototype, CoNi LDH material is designed with abundant H vacancies using electrochemical methods (denoted (v) ). As Zn‐ion battery cathode, exhibits promising performances in mild ZnSO 4 electrolyte, such good specific capacity 185 mAh g −1 at current density 1.2 A , high average discharge potential 1.6 V versus Zn 2+ /Zn, large energy 296.2 Wh kg power 1894 W outperforming most Experimental computational results indicate that introduced hydroxide matrix induce improved electronic conductivity cation adsorption thermodynamics, endowing activity reversible insertion. Structural spectroscopy studies identify experiences + /Zn co‐intercalation mechanism an electrolyte. far it known, first report on transition‐metal‐based