Synthesis of Zn2+-Pre-Intercalated V2O5·nH2O/rGO Composite with Boosted Electrochemical Properties for Aqueous Zn-Ion Batteries

Abstract

Layered vanadium-based materials are considered to be great potential electrode materials for aqueous Zn-ion batteries (AZIBs). The improvement of the electrochemical properties of vanadium-based materials is a hot research topic but still a challenge. Herein, a composite of Zn-ion pre-intercalated V2O5·nH2O combined with reduced graphene oxide (ZnVOH/rGO) is synthesized by a facile hydrothermal method and it shows improved Zn-ion storage. ZnVOH/rGO delivers a capacity of 325 mAh·g−1 at 0.1 A·g−1, and this value can still reach 210 mAh·g−1 after 100 cycles. Additionally, it exhibits 196 mAh·g−1 and keeps 161 mAh·g−1 after 1200 cycles at 4 A·g−1. The achieved performances are much higher than that of ZnVOH and VOH. All results reveal that Zn2+ as “pillars” expands the interlayer distance of VOH and facilitates the fast kinetics, and rGO improves the electron flow. They both stabilize the structure and enhance efficient Zn2+ migration. All findings demonstrate ZnVOH/rGO’s potential as a perspective cathode material for AZIBs.

Laser-assisted fabrication of a 3D cross-linked V2CTx/rGO microelectrode for high-rate aqueous zinc-ion microbatteries

“…S9 † demonstrate that, when compared to other vanadium-based materials utilized in AZIBs reported in recent years, it exhibits a remarkable advantage in terms of specic capacity. [31][32][33][34][35][36][37][38] Upon increasing the current density to 2.5 A g −1 , the absence of a distinct charge-discharge plateau in 3D VO x -V 2 CT x @rGO-30% can be attributed to its relatively dense interlayer distribution, which hinders the embedding and migration of zinc ions (Fig. 5c).…”

Defect Chemistry in Zn3V4(PO4)6

“…A combined experimental and DFT study of ZnCo 2 O 4 showed that the oxygen vacancy formation can improve the Zn 2+ ion diffusion by enlarging channels [73]. A facile hydrothermal method was applied to prepare a composite consisting of Zn x V 2 O 5 and graphene oxide to form a stabilized structure and enhance the diffusion of Zn 2+ ions [74].…”

Surfactant Additives Containing Hydrophobic Fluorocarbon Chains and Hydrophilic Sulfonate Anion for Highly Reversible Zn Anode

“…The dwindling reserves of fossil fuels and growing environmental awareness are driving the continued research on reliable large-scale battery systems for the storage and utilization of intermittent-generated renewable energy [ 1 , 2 , 3 , 4 , 5 ]. Lithium-ion batteries (LIBs) are the most extensively studied rechargeable batteries; however, they are not suitable for large-scale energy storage due to the scarcity of lithium resources and safety concerns [ 6 , 7 ].…”