Tunable Layered (Na,Mn)VO·HO Cathode Material for High-Performance Aqueous Zinc Ion Batteries
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Rechargeable aqueous zinc-ion batteries (ZIBs) show promise for use in energy storage. However, the development of ZIBs has been plagued by the limited cathode candidates, which usually show low capacity or poor cycling performance. Here, a reversible Zn//(Na,Mn)VO·HO system is reported, the introduction of manganese (Mn) ions in NaVO to form (Na,Mn)VO exhibits an outstanding electrochemical performance with a capacity of 377 mA h g at a current density of 0.1 A g. Through experimental and theoretical results, it is discovered that the outstanding performance of (Na,Mn)VO·HO is ascribed to the Mn/Mn-induced high electrical conductivity and Na-induced fast migration of Zn. Other cathode materials derived from (Na,Mn)VO·HO by substituting Mn with Fe, Co, Ni, Ca, and K are explored to confirm the unique advantages of transition metal ions. With an increase in Mn content in NaVO, (Na,Mn)VO ·HO can deliver a reversible capacity of 150 mA h g and a capacity retention of 99% after 1000 cycles, which may open new opportunities for the development of high-performance aqueous ZIBs.
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