Solution‐Processed All‐V₂O₅ Battery

Abstract

Exploring new battery technologies will promote the advance of energy storage systems. Designing a symmetrical‐structured rechargeable battery with the same electrode materials is a meaningful exploration for battery technology. Here, a solution‐processed all‐V2O5 rechargeable battery with V2O5 as both anode and cathode is presented, in which the anionic/cationic redox reactions are decoupled by precisely clamping its working potential windows. The battery shows good electrochemical performance with high capacity of 151 mAh g−1 at 0.10 C, good rate performance with 70% capacity retention when the current increases from 0.10 to 5 C, and promising cycling stability over 83% capacity retention after 900 cycles at 1 C. Moreover, the battery is highly profitable for simplified fabrication and scalable production, which benefits from its symmetrical configuration as well as the solution‐processed strategy. This work offers a new paradigm to construct advanced symmetrical energy storage devices.

Hierarchical K‐Birnessite‐MnO2 Carbon Framework for High‐Energy‐Density and Durable Aqueous Zinc‐Ion Battery

“…CNT@KMO@GC was then prepared based on a straightforward, versatile and scalable solutionprocessing strategy we developed. [45] G and CB composite ink was prepared by dispersing them in ethanol-terpineol mixed solution with the assistance of stabilizing polymer ethyl cellulose (EC). CNT@KMO was uniformly dispersed into the above ink, yielding a viscous composite ink after removing the excess ethanol.…”

“…b is equal to 1 implies the surface-controlled behaviors in electrode materials, and b is 0.5, suggesting the diffusion-controlled battery behaviors. [33,45] We then plotted the dependence curves between Log (|i p |) with Log (v) for the well-defined cathodic peaks, respectively (Figure 5j-l). The linear fitting b values of the observed cathodic peaks for these two samples are conformably fallen into the range of 0.5-0.7, suggesting their electrochemical charge storages are governed by both surface-controlled and diffusion-controlled reactions.…”

Enabling rapid pseudocapacitive multi-electron reactions by heterostructure engineering of vanadium oxide for high-energy and high-power lithium storage

“…The V 2p 3/2 spectrum of the pristine electrode can be deconvoluted into two peaks at 517.7 and 516.3 eV, corresponding to V 5+ and V 4+ , respectively. 43 Upon discharging to 1.4 V, two new peaks appear at lower binding energies of 515.2 and 513.9 eV, which are assigned to V 3+ and V 2+ , respectively. 31 When further charging back to 4 V, the electrode almost returns to the pristine V 2p 3/2 with no residual V 3+ /V 2+ states and a slightly increased V 4+ content.…”

Solution-Processed 2D Materials for Electronic Applications

“…This approach has been widely utilized for conductive thin-film formation, particularly for electrode applications in photovoltaics and lithium-ion batteries . For example, a blade-coated scalable V 2 O 5 nanobelt-graphene (VON-G) layer has been exploited as a battery electrode (Figure c) . Beyond the thin-film formation over the entire substrate, printing-based deposition techniques have been intensively studied toward lithography-free direct patterning of nanomaterials.…”

“…Finally, solution-based processing of nanomaterials can provide process flexibility to explore mixed-dimensional heterostructures. As illustrated in Figure f, mixed-dimensional heterostructures have been intensively explored to generate new functionalities for particular applications or maximized performances by precise design of heterostructures based on two or more different materials with different dimensions (e.g., zero-dimensional (0D) quantum dots with one-dimensional (1D) nanowires or 2D nanosheets). ,,, For example, a scalable synthesis of MoS 2 quantum dots (0D) decorated on 2D MoS 2 nanosheets has been reported as an example of a 0D/2D heterostructure (Figure g) . As an example of a 1D/2D heterostructure, a 1D VON and 2D graphene mixture can be synthesized by solution-based processing (Figure h) .…”