Driving intercalation kinetic through hydrated Na+ insertion in V2O5 for high rate performance aqueous zinc ion batteries

Layered porous Mn0.18V2O5@C with manganese and carbon provided by a metal–organic framework precursor as a cathode material for aqueous zinc-ion batteries

“…7a that the peak at about 11.8° almost disappears when the charging process reaches 1.6 V, showing good reversibility of the Zn 0.25 V 2 O 5 phase, which is consistent with earlier studies. 33 This reversible behavior of the formation and disappearance of the zinc vanadate phase during the cycle also indirectly implies that vanadium oxide is the main component of the MVO@C electrode material involved in the embedding and detachment of the zinc ions, which is consistent with the significant change of vanadium valency and no obvious change of the manganese element detected by XPS analysis during the cycling process. Unlike the diffraction peak of zinc vanadate at 11.8°, the diffraction peak at 29.3° did not disappear during the subsequent discharge, implying the formation of an irreversible phase.…”

“…The structural analysis has shown that the repeated intercalation and delamination of Zn 2+ during the cycling process would seriously distort the original V 2 O 5 layered structure and lead to irreversible structural degradation, and then cause poor cycling performance and rapid degradation of capacity. In order to solve these problems, some ions such as Mg 2+ , K + , Cu 2+ , Na + , Li + , Mn 2+ , [30][31][32][33][34][35] etc., are inserted into V 2 O 5 to expand its interlayer spacing, facilitate ion migration and prevent material collapse during charging and discharging. Usually, transition metal ions with diverse valence states have higher positive charge density and stronger electrostatic interaction than single valence cations, which is conducive to the formation of strong "pillars" in the vanadium oxide layer through oxygen bonds.…”

In Situ Raman Observation of Dynamically Structural Transformation Induced by Electrochemical Lithium Intercalation and Deintercalation from Multi‐Electrochromic V2O5 Thin Films

“…[5,6] Both amorphous and crystalline layered V 2 O 5 thin films enable reversibly electrochemical conduction cations intercalation and deintercalation enjoy multi-electrochromic performance, [5,7] accompanying a reversible redox reaction from V 2 O 5 to M x V 2 O 5 (M = Li, Na, Zn). [1,8,9] For instance, the nanocrystal-in-glass (nanocrystals embedded amorphous matrix) V 2 O 5 thin films with large interlayer spacing can withstand stress caused by intercalation/deintercalation of conduction ions into/from the host structure, thereby avoiding the collapse of the host structure of the film and realizing the reversible insertion of lithium ions. [8,10] The interface between the V 2 O 5 thin films and electrolytes has been shown to be crucial in determining the electrochemical and electrochromic properties.…”

“…Recently, various state-of-the-art in situ analysis methods have been utilized to uncover the structural changes in electrochemical interface of V 2 O 5 electrodes such as in situ X-ray diffraction, in situ transmission electron microscopy, and in situ Raman. [9,[14][15][16] Among them, in situ spectroscopic Raman detection is a powerful and sensitive tool to understand local structural variations of the electrode-electrolyte interface for the complex electrochemical interactions during cycling. A notable example is in situ spectroscopic Raman characterization of lithium intercalation and deintercalation in thin film Li-ion battery electrodes to monitor the microstructural evolution of the LiVO system, which indicates fully reversible structural changes from the αto δ-phase, irreversible γ-phase with the permanent bond breaking, and weakly crystallized ω-phase.…”

Zinc Vanadium Oxide Nanobelts as High-Performance Cathodes for Rechargeable Zinc-Ion Batteries

“…Additionally, in aqueous solutions, the operating voltage is relatively less (∼0.8 V) for V-based cathodes . To overcome the issues with respect to undesirable side reactions, energy density, and charge storage capacity, several strategies including doping and surface modification of the electrode and electrolytes have been employed. , In particular, V-based compounds suffer from low conductivity and poor cyclic stability, which have been mitigated by mixing with conductive materials such as reduced graphene oxide (rGO) and carbon nanotubes (CNTs). − …”