V2O5 nanopaper as a cathode material with high capacity and long cycle life for rechargeable aqueous zinc-ion battery

Rod-like anhydrous V2O5 assembled by tiny nanosheets as a high-performance cathode material for aqueous zinc-ion batteries

“…Multiple pairs of redox peaks can be observed, demonstrating a multistep Zn 2+ ion uptake/release process in V 2 O 5 cathode materials for AZIBs. [36][37][38][39] The CV curves of RA-V 2 O 5 at the 1 st cycle is different from that in the following cycles in terms of peak positions and proles, behind which the possible reason is the activation of V 2 O 5 . It is also seen that RA-V 2 O 5 exhibits more peaks than C-V 2 O 5 (Fig.…”

“…50) and Li 4 Ti 5 O 12 , 51 and higher than D Zn 2+ of previously reported V 2 O 5 . 38 Besides, the D Zn 2+ of RA-V 2 O 5 is slightly higher than that of C-V 2 O 5 in general, due to much larger specic surface area and pore volume of the former. That is, the ion diffusion at the surface and interface is much more favourable than that within the bulk, therefore contributing to improved rate performances in RA-V 2 O 5 .…”

“…30 Among various vanadium-based materials, anhydrous V 2 O 5 is of particular interest owing to its simple conguration and high valence state of vanadium that enable more active sites and higher specic capacity. [32][33][34][35][36][37][38][39][40] That is, anhydrous V 2 O 5 is free of cations (e.g., Zn 2+ , Li + , Na + , K + , Mg 2+ , Ca 2+ ) and H 2 O molecules within its layers, thus possessing higher gravimetric and volumetric specic capacities than other vanadium-based materials in theory, while such characteristic also makes Zn 2+ ion uptake difficult due to the limited interlayer space. 34,41,42 For instance, porous V 2 O 5 nanobers prepared by electrospinning and subsequent calcination delivers merely 319 mA h g À1 at a rather low current density of 0.02 A g À1 , which is substantially lower than the theoretical specic capacity ($589 mA h g À1 based on the two-electron redox center of vanadium) of V 2 O 5 .…”

Stereoassembled V 2 O 5 @FeOOH Hollow Architectures with Lithiation Volumetric Strain Self-Reconstruction for Lithium-Ion Storage

“…In practice, despite the high theoretic capacity as both anode and cathode mate-rials for LIBs, low electrical conductivity and large volumetric strains of V 2 O 5 inevitably render poor rate capability and cycling stability [15][16][17]. To address these issues, carbon modification has been one of the most intuitive approaches to promote the electron transport for numerous TMOsbased electrode materials [18][19][20].…”

Phosphorus/nitrogen co-doped and bimetallic MOF-derived cathode for all-solid-state rechargeable zinc–air batteries

“…[6][7][8][9] However, the inadequate catalytic activity of air cathodes during the charging (OER) and discharging (ORR) process greatly hinders their practical application. [10][11][12][13] Inspired by the notable electrocatalytic activity, noble metal-based catalysts are the rst consideration for air cathodes, such as Pt/C for OER and Ir-/Ru-based oxides for the ORR. But, their high cost and insufficient catalytic bifunctionality cannot support a sustainable operation system of all-solid-state rechargeable ZABs.…”