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

机译：Cobalt–Nickel Double Hydroxide toward Mild Aqueous Zinc-Ion Batteries

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摘要

Transition metal layered double hydroxides (LDHs) are widely used as highperformancecathode materials for aqueous alkaline zinc (Zn) batteries. Yet,the strongly alkaline electrolytes may lead to undesirable rechargeability ofthe alkaline devices and environmental issues. Herein, as a research prototype,CoNi LDH material is designed with abundant H vacancies usingelectrochemical methods (denoted as CoNi LDH(v)). As a Zn-ion batterycathode, CoNi LDH(v) exhibits promising electrochemical performances inmild ZnSO_4 electrolyte, such as a good specific capacity of 185 mAh g~(?1) at thecurrent density of 1.2 A g~(?1), a high average discharge potential of 1.6 V versusZn~(2+)/Zn, and a large energy density of 296.2 Wh kg~（?1） at the power densityof 1894 W kg~(?1), outperforming most of the cathode materials for aqueousZn-ion batteries. Experimental and computational results indicate that theintroduced H vacancies in the double hydroxide matrix induce the improvedelectronic conductivity and cation adsorption thermodynamics, endowingthe double hydroxides with good electrochemical activity for reversible cationinsertion. Structural and spectroscopy studies identify that CoNi LDH(v) experiencesreversible H+/Zn~(2+) co-intercalation mechanism in an aqueous ZnSO_4electrolyte. As far as it is known, it is the first report on transition-metal-baseddouble hydroxides used for mild aqueous Zn-ion batteries.

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