A 1D Honeycomb‐Like Amorphous Zincic Vanadate for Stable and Fast Sodium‐Ion Storage

Abstract

With the rapid development of intermittent renewable energy and regional smart grid, lithium-ion batteries (LIBs) are failing to accommodate the growing requirement for large-scale energy storage applications, due to the resource constraints of lithium. [1][2][3] In recent years, sodium-ion batteries (SIBs) have been researched as one of the potential alternatives to LIBs considering the earth abundance and low cost of sodium. [4][5][6] Developing anode materials with stable and fast sodium-ion storage properties is one of the keys to the commercial application of SIBs. [6,7] However, despite the similar working mechanism of SIBs and LIBs, many common anode materials are not suitable for SIBs, while display excellent lithium storage properties in LIBs. [8][9][10] Compared with lithium-ion, sodium has a larger ionic radius and atomic mass, which lead to sluggish reaction kinetics and drastic volume change of anode materials during sodiation/desodiation processes. [4,11] For example, as one of promising mixed transition metal oxides (MTMOs) anode materials for LIBs, metal vanadates usually show outstanding lithium storage performance with high specific capacities Developing nanomaterials with synergistic effects of various structural merits is considered to be an effective strategy to improve the sluggish ion kinetics and severe structural degradation of sodium-ion battery (SIB) anodes. Herein, honeycomb-like amorphous Zn 2 V 2 O 7 (ZVO-AH) nanofibers as SIBs anode material with plentiful defective sites, complex cavities, and good mechanical flexibility are reported. The fabrication strategy relies on the expansive and volatile nature of the organic vanadium source, based on a simple electrospinning with subsequent calcination. Originating from the synergies of amorphous nature and honeycomb-like cavities, ZVO-AH shows increased electrochemical activity, accelerated Na-ion diffusion, and robust structure. Impressively, the ZVO-AH anode delivers superior cycle stability (112% retention at 5 A g −1 after 5000 cycles) and high rate capability (150 mAh g −1 at 10 A g −1 ). The synthetic versatility is able to synergistically promote the practical application of more potential materials in sodium-ion storage. www.advancedsciencenews.com

Bichannel design inspired by membrane pump: a rate booster for the conversion-type anode of sodium-ion battery

“…50 It is thought that the defects along with the interface of cobalt/Na 4 P 2 O 7 domains, caused by amorphization, act as channels for short-circuit diffusion, and the high atomic mobility within the amorphous region also facilitates the sodium diffusion. 51,52 However, the variation of the diffusion coefficient is minute in the charging process (Fig. 4i), verifying that the process of structural change has been completed during the initial discharge process.…”

Lithium‐ion battery anode with high capacity retention derived from zinc vanadate and holey graphene

“…The characteristic Raman peaks of Zn 3 V 2 O 8 /hGO at 312.9 and 839.1 cm À1 are due to V-O-V bending vibrations and V-O symmetric stretching vibration modes together with the existence of G and 2D bands originating from the vibration of sp 2 -carbon atoms and disorder in graphene sheets, respectively. 20,39 The D band of graphene is not detected in the Raman spectra of Zn 3 V 2 O 8 /hGO (Figure 5A) owing to the higher mass loading of Zn 3 V 2 O 8 suppressing the characteristic defect feature of graphene at 1352.1 cm À1 . 39 In addition, the Raman bands in Zn 3 V 2 O 8 /hGO become broad and weak together with a shift to lower wavenumbers indicating the slight distortion in lattice with alteration in bond lengths and bond angles.…”

“…initially emerged as promising materials as a cathode material in batteries including SIBs, LIBs, ZIBs and KIBs but have recently gained attention as anodes, especially their carbon‐based composites have proven their flair as a robust anode material in many of this battery chemistries 13,14 . They own a rich class of diverse coordination structures represented by MV 3 O 8, 15 MVO 4, 16 MV 2 O 4, 17,18 MV 2 O 6 , 19 M 2 V 2 O 7, 8,20 M 3 V 2 O 7 21 and M 3 V 2 O 8 22,23 . The very known limiting factors include low electronic and ionic conductivity, besides the undesired volume expansion that bothers more capacity degradation, particularly at increased current densities 15,24 …”

Spinel rGO Wrapped CoV2O4 Nanocomposite as a Novel Anode Material for Sodium-Ion Batteries

“…Currently, metal-based electrode materials, such as metal oxides [4], metallic selenides [5], bimetallic sulfides [6], and other metal-based electrode materials [7][8][9], have been widely established and developed for high-energy density SIBs applications. Among these, vanadium with mixed metal oxide-based anode materials tends to display improved electrochemical properties because of the higher energy density, existing in a diversity of oxidation states, and offering a considerably wider potential window for Li/Na ion batteries [8][9][10][11]. Nonetheless, vanadate-based anodes for SIBs suffer from rapid capacity decay and poor rate performance as a result of the extreme pulverization and slow kinetics upon the sodiation/desodiation process [11].…”

“…Among these, vanadium with mixed metal oxide-based anode materials tends to display improved electrochemical properties because of the higher energy density, existing in a diversity of oxidation states, and offering a considerably wider potential window for Li/Na ion batteries [8][9][10][11]. Nonetheless, vanadate-based anodes for SIBs suffer from rapid capacity decay and poor rate performance as a result of the extreme pulverization and slow kinetics upon the sodiation/desodiation process [11]. These drawbacks have been amended by modified carbonaceous materials.…”