Ultralong cycle stability of aqueous zinc-ion batteries with zinc vanadium oxide cathodes (original) (raw)
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Organic cathode materials for aqueous zinc-organic batteries
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Aqueous zinc batteries that utilize metallic Zn as the anode are considered as a promising alternative to lithium-ion batteries due to their intrinsic high safety, low cost, and relatively high energy density. Compared to inorganic cathodes, organic cathodes exhibit several advantages including high theoretical capacity, tunable structure, abundant sources, and environmental friendliness. In this paper, we summarize the recent progress in organic cathodes for aqueous zinc-organic batteries, covering the working mechanisms of three typical types of organic cathodes, their electrochemical performance, and common strategies for further improvement. Finally, we discuss the current challenges and possible future research directions. We hope this review will offer useful information for exploring high-performance organic cathodes.
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Mildly acidic aqueous zinc (Zn) batteries are promising for large-energy storage but suffer from the irreversibility of Zn metal anodes due to parasitic H2 evolution, Zn corrosion, and dendrite growth. In recent years, increasing efforts have been devoted to overcoming these obstacles by regulating electrolyte structures. In this review, we investigate progress towards mildly acidic aqueous electrolytes for Zn batteries, with special emphasis on how the microstructures (in the bulk phase and on the surface of Zn anodes) affect the performance of Zn anodes. Moreover, effective computational simulations and characterization measurements for the structures of bulk electrolytes and Zn/electrolyte interfaces are discussed, along with perspectives for the direction of further investigations.
Energy Technology, 2019
Aqueous zinc-ion batteries (ZIBs) have gained numerous interests in energy storage field with favorable merits of high-security and low-cost. Yet their development is still in the infant stage. Herein, V 6 O 13 is investigated as aqueous ZIBs cathode with excellent Zn 2+ storage performance, as compared with VO 2 and V 2 O 5. The intrinsic open structure of V 6 O 13 with mixed V valence (V 4+ /V 5+) is favorable to enable fast Zn 2+ ions diffusion and improved electronic conductivity, outperforming VO 2 and V 2 O 5. Significantly, highly reversible phase transition of zinc vanadate (Zn 0.25 V 2 O 5 •H 2 O) can be detected during discharging, which enables the insertion of more Zn 2+ ions into the host structure. As a result, V 6 O 13 is capable of exhibiting enhanced electrochemical properties, including high capacity and excellent long-term cyclability (206 mA h g-1 at 10 A g-1 after 3000 cycles).
Journal of Energy Chemistry, 2021
Aqueous rechargeable zinc batteries are getting increasing attention for large-scale energy storage owing to their advantages in terms of cost, environmental friendliness and safety. Here, the layered puckered γ'-V2O5 polymorph with a porous morphology is firstly introduced as cathode for an aqueous zinc battery system in a binary Zn 2+ /Li + electrolyte. The Zn||γ'-V2O5 cell delivers high capacities of 240 and 190 mAh g-1 at current densities of 29 and 147 mA g-1 , respectively, and remarkable cycling stability in the 1.6 V-0.7 V voltage window (97% retention after 100 cycles at 0.15 A g-1). The detailed structural evolution during first discharge-charge and subsequent cycling is investigated using X-ray diffraction and Raman spectroscopy. We demonstrate a reaction mechanism based on a selective Li insertion in the 1.6 V-1 V voltage range. It involves a reversible exchange of 0.8 Li + in γ'-V2O5 and the same structural response as the one reported in lithiated organic electrolyte. However, in the extended 1.6 V-0.7 V voltage range, this work puts forward a concomitant and gradual phase transformation from γ'-V2O5 to zinc pyrovanadate Zn3V2O7(OH)2.2H2O (ZVO) during cycling. Such mechanism involving the in-situ formation of ZVO, known as an efficient Zn and Li intercalation material, explains the high electrochemical performance here reported for the Zn||γ'-V2O5 cell. This work highlights the peculiar layered-puckered γ'-V2O5 polymorph outperforms the conventional α-V2O5 with a huge improvement of capacity of 240 mAh g-1 vs 80 mAh g-1 in the same electrolyte and voltage window.
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ACS Nano, 2018
Wireless electronic devices require small, rechargeable batteries that can be rapidly designed and fabricated in customized form factors for shape conformable integration. Here, we demonstrate an integrated design and manufacturing method for aqueous zinc-ion batteries composed of polyaniline (PANI)-coated carbon fiber (PANI/CF) cathodes, laser micromachined zinc (Zn) anodes, and porous separators that are packaged within three-dimensional printed geometries, including rectangular, cylindrical, Hand nd ring-shapes. The PANI/CF cathode possesses high surface area and conductivity giving rise to high rate (∼600 C) performance. Due to outstanding stability of Zn-PANI batteries against oxygen and moisture, they exhibit long cycling stability in an aqueous electrolyte solution. As exemplar, we demonstrated rechargeable battery packs with tunable voltage and capacity using stacked electrodes that are integrated with electronic components in customized wearable devices.