Binder-free three-dimensional interconnected CuV₂O₅·nH₂O nests as cathodes for high-loading aqueous zinc-ion batteries

Abstract

In large-scale energy storage applications, aqueous zinc ion batteries (ZIBs) with low cost, safety, high theoretical capacity, and environmentally friendly have wide application prospects. In the reported cathode materials, the...

Boosting Material Utilization via Direct Growth of Zn2(V3O8)2 on the Carbon Cloth as a Cathode to Achieve a High‐Capacity Aqueous Zinc‐Ion Battery

“…It shows high reversibility of Zn 2+ ion de‐/intercalation, which may be attributed to the binder‐free approach, which greatly enhances the electron transport properties in the cathode. The Ragone plot shown in Figure 3d [ 9,13,15–19 ] demonstrates the relationship between energy and power density of the ZVO@CC electrode, which has an impressively higher energy density (395.9 Wh kg −1 ) and power performance compared to several previously reported important vanadium‐based cathode materials for AZIBs, further demonstrating the excellent performance of the electrode. Meanwhile, to compare the advantages of the binder‐free method, the Zn 2 (V 3 O 8 ) 2 powder collected during the hydrothermal preparation is coated on the titanium foil, and its rate capability is tested.…”

Achieving Stable Copper Ion Storage in Layered Vanadium Pentoxide

“…The XPS data are in accordance with XRD and ICP results. Of note is the spectrum of Cu 2p (Figure 3b), where the satellite peaks at 941.78 and 944 eV as well as the strong satellite peak at 934.83 eV are coherent with the CuO spectra, suggesting the presence of +2 valence Cu in the discharged sample [29]. Hybridization between Cu 3d and other valence orbitals, especially when the oxygen in the local chemical environment is linked to V or H, and the presence of strong Coulombic interactions between the 3d electrons lead to the appearance of other satellite peaks.…”

“…Carbon cloth current collector was pre-processed by an alkaline treatment [29]. Purchased clean carbon cloths were soaked in a 15 wt% KOH solution for 4 h, then the soaked cloths were placed in a tube furnace and calcined at 850 • C for 4 h under an inert gas atmosphere.…”

Dual-Ion Co-intercalation Mechanism on a Na2V6O16·3H2O Cathode with a Commercial-Level Mass Loading for Aqueous Zinc-Ion Batteries with High Areal Capacity

“…12,14 Such outperformance is ascribed to the high mass loading of Na 2 V 6 O 16 •3H 2 O in the electrode, which is ∼15 mg cm −2 and comparable to that employed in commercial LIBs, and most significantly, its exceptional gravimetric capacity achieving 305 mAh g −1 (corresponding to an areal capacity of 4.6 mAh cm −2 ) at a specific current of 20 mA g −1 , which is among the highest reported for additional vanadium bronzes in the literature (Figure 3f and Table S1). 55,56 Such superiority is attributed to not only the facile ion transport kinetics, as already discussed in great detail in the previous paragraph, but also the rapid conduction of the electrons throughout the entire Na 2 V 6 O 16 •3H 2 O/ACC electrode, which is further investigated first by means of EIS at an applied potential of 1.2 V (vs Zn/Zn 2+ ) over a frequency range of 10 mHz to 100 kHz with an amplitude of 10 mV. Kinetic analysis of the as-obtained EIS Nyquist plot using the complex nonlinear least square fitting method based on the equivalent circuit shown in the inset in Figure 3g immediately follows to obtain the series resistance (R s ), the diffusion resistance (R w ), and the diffusion time constant (L a R s is the series resistance (Ω cm 2 ); C dl is the solution resistance (mF cm −2 ); R ct is the charge transfer resistance (Ω cm 2 ); C T is the phase change capacitance (F cm −2 ); R T is the structural change resistance (Ω cm 2 ); R w is the diffusion resistance (Ω cm 2 ), and L 2 /D ion is the diffusion time constant (s).…”