Rechargeable Aqueous Zinc‐Ion Battery Based on Porous Framework Zinc Pyrovanadate Intercalation Cathode

Abstract

In this work, a microwave approach is developed to rapidly synthesize ultralong zinc pyrovanadate (Zn V O (OH) ·2H O, ZVO) nanowires with a porous crystal framework. It is shown that our synthesis strategy can easily be extended to fabricate other metal pyrovanadate compounds. The zinc pyrovanadate nanowires show significantly improved electrochemical performance when used as intercalation cathode for aqueous zinc-ion battery. Specifically, the ZVO cathode delivers high capacities of 213 and 76 mA h g at current densities of 50 and 3000 mA g , respectively. Furthermore, the Zn//ZVO cells show good cycling stability up to 300 cycles. The estimated energy density of this Zn cell is ≈214Wh kg , which is much higher than commercial lead-acid batteries. Significant insight into the Zn-storage mechanism in the pyrovanadate cathodes is presented using multiple analytical methods. In addition, it is shown that our prototype device can power a 1.5 V temperature sensor for at least 24 h.

Highly Stable Aqueous Zinc‐Ion Storage Using a Layered Calcium Vanadium Oxide Bronze Cathode

“…Even at af ast charge-discharge rate of 80 C (45 s), these CVOe lectrodes still offer ah igh capacity of 72 mA hg À1 due to the fast Zn 2+ ion migration. [2] It is worthwhile to note that the Columbic efficiency of the CVOc athode during cycling tests is close to 100 %, confirming that the impressive cycling performance is not due to parasitic reactions.F igure 2fshows the Ragone plot of our Zn//CVOc ell, in comparison to other reported intercalation Zn cells.I mpressively,o ur devices show av ery high energy density of 267 Whkg À1 at ap ower density of 53.4 Wkg À1 .E ven the cell is charged within 45 s, the energy density is still as high as 133 Whkg À1 at an outstanding power density of 1825 Wkg À1 .F urthermore,i tc an be seen that our cells offer better performance than cells based on Zn 3 V 2 O 7 -(OH) 2 , [14] Zn 0.25 V 2 O 5 ·n H 2 O, [2] Zn 3 [Fe(CN) 6 ] 2 [8a] CuHCF, [8b] VS 2 , [15] FeFe(CN) 6 , [16] and Na 0.95 MnO 2 [17] cathodes. 96 %retention) even at very high current density of 80 C (Figure 2e).…”

Achieving High‐Voltage and High‐Capacity Aqueous Rechargeable Zinc Ion Battery by Incorporating Two‐Species Redox Reaction

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safety, and low cost. Currently, the most studied cathode active materials are manganesebased [6][7][8][9] and vanadium-based [10][11][12][13] composites. Various cathode materials have been developed to navigate these challenges.

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“…[1][2][3][4][5] However, the strong electrostatic interaction with host materials originating from divalent chemistry leads to low output voltage, poor reversibility, and especially sluggish kinetics. Furthermore, poor rate capability limits application of Zn-ion batteries in high-power appliances.The Prussian blue analogues (PBAs) possessing a 3D open framework with large interstitial sites, [4][5][6][7][8][9][10][11][12][13][14][15][16] are considered as a promising host material for reversible Zn-ion intercalation/deintercalation with fast charge/discharge properties and high operational voltage, which is ascribed to its ideal crystal structure and desirable electrochemical properties. Currently, the most studied cathode active materials are manganesebased [6][7][8][9] and vanadium-based [10][11][12][13] composites.…”

“…The Prussian blue analogues (PBAs) possessing a 3D open framework with large interstitial sites, [4][5][6][7][8][9][10][11][12][13][14][15][16] are considered as a promising host material for reversible Zn-ion intercalation/deintercalation with fast charge/discharge properties and high operational voltage, which is ascribed to its ideal crystal structure and desirable electrochemical properties. [17] Recently, hexacyanometallates with a typical formula of A x M′[M″(CN) 6 ] y ⋅nH 2 O (simply denoted as M′/M″ PBA) are investigated as cathode active materials for aqueous batteries including Li-, Na-, Mg-, Ca-, and Zn-ion batteries, where the A…”

Delaminating Vanadium Carbides for Zinc‐Ion Storage: Hydrate Precipitation and H+/Zn2+ Co‐Action Mechanism

“…Moreover, Zn metal has both a high theoretical gravimetric and volumetric capacity about 820 mA h g −1 and 5855 mA h cm −3 , respectively . In addition, the cathode materials for ZIB are usually intercalable materials such as vanadium oxide and α‐, β‐, δ‐ or γ‐MnO 2 with different storage mechanism . Actually, most of ZIB devices still suffer from insufficient durability and comparable low electrochemical performance, the ion storage mechanism is also still controversial.…”