Vanadium Oxides with Amorphous‐Crystalline Heterointerface Network for Aqueous Zinc‐Ion Batteries

Abstract

Rechargeable aqueous Zn‐VOx batteries are attracting attention in large scale energy storage applications. Yet, the sluggish Zn2+ diffusion kinetics and ambiguous structure–property relationship are always challenging to fulfil the great potential of the batteries. Here we electrodeposit vanadium oxide nanobelts (VO‐E) with highly disordered structure. The electrode achieves high capacities (e.g., ≈5 mAh cm−2, 516 mAh g−1), good rate and cycling performances. Detailed structure analysis indicates VO‐E is composed of integrated amorphous‐crystalline nanoscale domains, forming an efficient heterointerface network in the bulk electrode, which accounts for the good electrochemical properties. Theoretical calculations indicate that the amorphous‐crystalline heterostructure exhibits the favorable cation adsorption and lower ion diffusion energy barriers compared to the amorphous and crystalline counterparts, thus accelerating charge carrier mobility and electrochemical activity of the electrode.

Amorphous/crystalline heterostructure design enables highly efficient adsorption–diffusion–conversion of polysulfides for lithium–sulfur batteries

“…1j 2 ), suggesting a non-crystalline structural feature. 34,35 Additionally, EDS mapping analysis (Fig. 1k–n) indicates the homogeneous distribution of O, Se, and Bi elements in the c-Bi 2 Se 3 /a-BiO x heterostructure.…”

“…Recently, amorphous/crystalline heterostructures have received particular interest for energy storage and conversion. [33][34][35] Unlike crystalline materials, amorphous materials with long-range disordered structures have distinctive characteristics, such as unsaturated electronic congurations, substantial dangling bonds and abundant defect sites, which are conducive to the enhancement of LiPS adsorption. 36,37 Besides, the structural exibility of amorphous materials contributes to both volume and surface conned catalysis.…”

Structural Reconstruction Strategy Enables CoFe LDHs for High‐Capacity NH4+ Storage and Application in High‐Energy Density Ammonium‐Ion Hybrid Supercapacitors**

“…In brief, the above‐mentioned results prove the electrochemical activation process is a powerful strategy to boost the energy storage capability of SR‐CoFe LDHs‐20 in dilute (NH 4 ) 2 SO 4 electrolyte. The loosely packed nanosheets can offer a short ion diffusion distance and are favorable for fast ion transportation [49,50] . Besides, the nanopores formed among the nanosheets can buffer the volume changes during the GCD process [26,31] .…”

General Carbon Modification Avenue to Construct Highly Stable V2O5 Electrodes for Aqueous Zinc-Ion Batteries

“…It mainly includes tunnel-type, , layered-type, , NASICON-type, , and spinel structures . Meanwhile, layered V 2 O 5 material possesses superior Zn 2+ storage performance . In literature, Bao et al synthesized V 2 O 5 nanoribbons with a capacity of 444 mAh g –1 at 0.5 A g –1 .…”

“…21 Meanwhile, layered V 2 O 5 material possesses superior Zn 2+ storage performance. 22 In literature, Bao et al 23 synthesized V 2 O 5 nanoribbons with a capacity of 444 mAh g −1 at 0.5 A g −1 .…”