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Oxygen-Deficient HNaV6O16·4H2O@Reduced Graphene Oxide as a Cathode for Aqueous Rechargeable Zinc-Ion Batteries

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journal contribution
posted on 2022-07-13, 03:13 authored by Jian Wu, Zhanhong Yang, Hongzhe Chen
Aqueous zinc ion batteries (AZIBs) are considered as grid energy storage materials due to their high abundance, low cost, safety, pollution-free characteristic. However, its poor conductivity and insufficient structural stability are still the key factors restricting the development of cathode materials. Therefore, we adopt a one-step hydrothermal method to construct HNaV6O16·4H2O@reduced graphene oxide with oxygen-rich defects and large Zn2+ deintercalation channels of 10.87 Å (Od-HNaVO@rGO). Encouragingly, our constructed oxygen-deficient Zn//Od-HNaVO@rGO battery possesses 380.4 mA h g–1 at 0.5 A g–1 with 97.4% capacity retention and exhibits a 258.9 mA h g–1 discharge capacity at 3 A g–1 after 2500 cycles, which is 4.79 times that of a NaVO@rGO electrode and 5.9 times that of a HNaVO electrode. Meanwhile, it has a high power density of 1273.1 W kg–1 and an energy density of 207.9 W h kg–1 at 5 A g–1, lighting up a light bulb by connecting two batteries in series. Furthermore, ex situ XRD and XPS techniques reveal the zinc storage mechanism of the Od-HNaVO@rGO electrode, which follows the energy storage mechanism of the co-intercalation of Zn2+ and H+ while reversibly generating the by-product Zn3(OH)2V2O7·2H2O. Therefore, this work will open up a new way for the design of high-efficiency electrode cathode materials.

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