V₂O₅ Aerogel as a Versatile Cathode Material for Lithium and Sodium Batteries

Abstract

Vanadium oxide gels are appealing cathode materials as they offer multiple electron redox processes leading to high cation‐storage capacities. Moreover, they are able to intercalate different ionic and molecular species. Apart from low electronic conductivity, one of the main factors hindering the use of highly porous V2O5 gels is the difficulty in preserving their unique morphology, made up of an entangled network of thin ribbons, during conventional laminated electrode preparation. In this study, we tune the V2O5 synthesis conditions and use an innovative and green binder system (polyacrylic acid and ethanol) to obtain electrodes with a morphology optimized for ion intercalation. The electrochemical performance of such electrodes, tested against lithium and sodium anodes, are shown to be excellent.

Lattice Breathing Inhibited Layered Vanadium Oxide Ultrathin Nanobelts for Enhanced Sodium Storage

“…11,16,22 With a larger interlayer spacing than the orthorhombic V 2 O 5 , the layered vanadium oxide xerogel structure exhibits remarkable sodium storage capacity. 18,23 During sodiation/desodiation, the xerogel bilayer structure undergoes large lattice parameter changes: the lattice parameter c shrinks during ion insertion and expands during ion extraction. 18 This type of repeated lattice/interlayer shrinkage and expansion, which is like the breath, is termed "lattice breathing".…”

“…These values are higher than those of the VO x (65 and 43 mAh g −1 at 1.0 and 2.0 A g −1 ) and comparable to the previous reports. 19,23,28,29 To understand the enhanced electrochemical performance of Fe-VO x , we carried out four-point probe test and electrochemical impedance spectra (EIS). The nanobelts are filtered to prepare free-standing films for the fourpoint probe test.…”

Exploring the Low Voltage Behavior of V2O5Aerogel as Intercalation Host for Sodium Ion Battery

“…17,20 With regards to negative electrodes suitable for applications in Na batteries the choice is quite limited. Hard carbons demonstrated good specific capacities and high cycling stability.…”

“…10,21 Moreover, V 2 O 5 can be synthesized with different particle morphologies, such as nanowires or nanoribbons, having high surface areas and reduced solid-state diffusion pathways. 17,20 With regards to negative electrodes suitable for applications in Na batteries the choice is quite limited. Hard carbons demonstrated good specific capacities and high cycling stability.…”

Nanostructured layered vanadium oxide as cathode for high-performance sodium-ion batteries: a perspective

“…6(a)]. [41] When applied as a SIBs cathode, high specific capacities were achieved due to its open framework with expanded interlayer spacing and decreased diffusion path [ Fig. 6(b)].…”