Synthesis of Zn Intercalated Zn–V@Mo–V Nanorods-based Cathodes for Prolonged Cyclic Stability of Rechargeable Aqueous Zinc-Ion Batteries

Abstract

Stationary rechargeable Zn-ion batteries (ZIBs) are attractive energy storages systems because of their natural abundance, safety, and low cost. High capacity, stable, and robust cathode materials play an important role in aqueous electrolyte systems in ZIBs, where metal oxide cathode dissolution is a problem that needs to be addressed. Herewith, we report an intercalation-type Zn-doped Zn−V@Mo−V (ZMV) cathode material affording prolonged cycle stability and high storage capacity. Porous, superfine nanostructures offer Zn 2+ ion diffusion pathways, alleviating intercalation redox reactions without dissolution. Zn doping restructures the cathode expansion-like, resulting in increased electrical conductivity and faster electrochemical ion diffusion. A reversible and uniform Zn electroplating at the anode surface interface indicates improved cell reversibility. The ZMV cathode scales up to assemble a pouch cell of Zn//ZnSO 4 //ZMV, where the cathode enhances the rate performance and decreases the selfdischarge rate. High efficiency and long cycle life can be endowed to the cathode material to construct a stable Zn-ion battery, accelerating the commercialization of the whole system.

Unveiling the Ultrahigh-Voltage Platform of Hydrated V3O7 in Carbon Network for Enhancing Aqueous Zinc-Ion Batteries Performance

“…Finally, a 2D band peak is observed at 2447 cm −1 in the BRC whose behavior was similar to that of reduced graphene oxide, and the I D /I G ratio is approximately 0.80. [12][13][14]14 Notably, this peak has a weak intensity compared with other pristine graphene samples. Importantly, all these identified peaks precisely match the standard peaks of the hydrated V 3 O 7 @C layered nanosheets sample, confirming the accuracy of the analysis.…”

Rational Design of Ni-Doped V2O5@3D Ni Core/Shell Composites for High-Voltage and High-Rate Aqueous Zinc-Ion Batteries

“…Generally, the narrow interlayer spacing and poor electronic conductivity of vanadium-based materials can lead to slow reaction kinetics and unstable structures during the Zn 2+ (de)incorporation process, limiting their applications in ZIBs [ 32 ]. For this issue, the incorporation of metal ions, such as Na + , Li + , Mg 2+ , Mn 2+ , and Cu 2+ [ 33 , 34 , 35 , 36 , 37 ], has been classified as one of the most effective strategies to enlarge interlayer spacing. In addition, metallic element incorporation adjusts the composition of V-based materials while changing their structures and thus improves electronic conductivity [ 38 ].…”