A Durable Na_0.56V₂O₅ Nanobelt Cathode Material Assisted by Hybrid Cationic Electrolyte for High‐Performance Aqueous Zinc‐Ion Batteries

Abstract

Rechargeable aqueous Zn‐ion batteries (ZIBs) show attractive potential in energy storage devices on account of high safety and eco‐friendliness. Yet the lack of suitable cathode materials prevented the practical application of ZIBs. In our work, a Na0.56V2O5 (NVO) nanobelt cathode material has been fabricated via a hydrothermal reaction. The prepared NVO samples reveal an expanded layer spacing, assisted by the chemical intercalation of Na+ into the V2O5. Particularly, a mild hybrid cationic electrolyte (0.5HCE, containing 3 M ZnSO4 and 0.5 M Na2SO4) was employed to replace the traditional ZnSO4 electrolyte (ZE) in the Zn//NVO system. Owing to the enlarged interlayer spacing and the protective effect of 0.5HCE, the NVO cathode delivers a preferable capacity and good cyclic stability. More specifically, the NVO cathode in 0.5HCE displays a high initial discharge capacity of 317 mAh g−1 at 0.1 A g−1, and exhibits a good stability after 1000 cycles at the current density of 1 A g−1. Besides, the Zn//NVO battery also presents a favorable rate capability and a high reversibility. This study could provide new directions for the development of low‐cost zinc ion batteries.

Hierarchical MoS2@CNTs Hybrid as a Long‐Life and High‐Rate Cathode for Aqueous Rechargeable Zn‐Ion Batteries

“…Despite merits mentioned above, the implementation of ARZIBs is severely hindered by the lack of suitable cathode materials . During the past few years, Mn‐based oxides and V‐based oxides have been strongly studied as the cathode of ARZIBs . However, the high electronegativity of oxygen usually induces complex electrochemical behaviors associated with phase transformation or formation of a zinc containing phase during Zn 2+ insertion/extraction, deteriorating the zinc storage performance of these cathodes .…”

Nickel@Nickel Oxide Dendritic Architectures with Boosted Electrochemical Reactivity for Aqueous Nickel–Zinc Batteries

“…[22][23][24][25][26] Although the Zn anodes own the high theoretical capacity (820 mAh g À 1 ) and low redox potential, the further development and utilization of NiÀ Zn batteries are largely restrained by the inevitable dendrite growth of Zn anodes and non-reversibility of Ni-based cathodes, which will lead to poor cycling stability. [27,28] For the purpose of tackling this problem, considerable efforts have been spent questing for high capacity Ni-based cathodes. Many kinds of Ni-based nanostructure including NiO nanosheets, [24] Co-doped Ni(OH) 2 nanosheets (NAA@CNH), [25] β-Ni(OH) 2 spheres, [29] Ni 3 S 2 nanosheets, [30] ultrathin porous Co 3 O 4 nanosheets on Ni foam, [31] and LiCo 1/3 Mn 1/3 Ni 1/3 PO 4 olivine [32] have been designed with controllable appearance and various adjustable components, obtaining boosted energy density and long cyclic stability.…”

Cathodes for Aqueous Zn‐Ion Batteries: Materials, Mechanisms, and Kinetics

“…More than 179 mineral species with V atoms can be found and studied as the energy storage materials, including for the aqueous ZIB system. A large number of related works have been reported in the last ten years and the vanadium‐based materials can act as excellent Zn 2+ storage host materials [91–97] . The outstanding capability for Zn 2+ storage is attributed to the superior crystal structures of the V‐based materials and it is necessary to well understand the structure properties of V‐based materials.…”