Reversible V3+/V5+ double redox in lithium vanadium oxide cathode for zinc storage

Rechargeable aqueous zinc‐based batteries (AZBs) have been recently considered as desirable energy storage devices for renewable energy storage because of their high theoretical capacity, low cost, and high safety. Despite the inspiring achievements in this field, the energy density of AZBs is still far below expectation, which directly hinders their practical application as next‐generation secondary cells. To address this issue, previously, reseach efforts have been mainly dedicated to the improvement of capacity by designing different kinds of high‐capacity electrode candidates, especially the cathode materials. In recent years, elevation of the output voltage for energy density improvement has gained more and more attention. The main limitation of the relatively low output voltage of AZBs lies in the narrow electrochemically stable window of aqueous electrolytes, which results in limited choice of cathode materials with high potential. Herein, by summarizing recently reported work in this field, the strategies applied to high‐voltage AZB construction are classified into two categories, from the aspects of electrode and battery structure. Classic examples of each category are discussed in detail, and their respective advantages/defects are compared and commented on. Finally, further challenges are elaborated to provide more insights into this area.

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“…Summary of electrode potentials of reported cathode materials for AZBs. [ 34,45,46,48,56,75–78,86–112 ] …”

Section: Toward High‐voltage Azbs: Strategies and Advancementsmentioning

confidence: 99%

High‐Voltage Rechargeable Aqueous Zinc‐Based Batteries: Latest Progress and Future Perspectives

Xie

Zhang

et al. 2021

Small Science

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“…[ 30 ] The diameter of a semicircle in the high‐frequency region gives interface resistance R i , which is possibly caused by the solid‐electrolyte interface. [ 31 ] The semicircle in the middle‐frequency region is related to reaction kinetics, which is represented by the charge‐transfer resistance R ct . The R ct value of E‐AVNF (20.7 Ω) is lower than that of AVNF (26.3 Ω), indicating the faster reaction kinetics of E‐AVNF.…”

Section: Resultsmentioning

confidence: 99%

Controlling Vanadate Nanofiber Interlayer via Intercalation with Conducting Polymers: Cathode Material Design for Rechargeable Aqueous Zinc Ion Batteries

Kim

Lee

Park

et al. 2021

Adv Funct Materials

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Aqueous zinc ion batteries (ZIBs) are promising energy storage devices due to the high ionic conductivity of the aqueous electrolyte as well as the safety, eco‐friendliness, and low cost. Vanadium oxide‐based materials are attractive cathode materials for aqueous ZIBs because of their high capacity from their layered structure and multiple valences. However, it is difficult to achieve high cycle stability and rate capability due to the low electrical conductivity and trapping of diffused electrolyte cations within the crystal structure, limiting the commercialization of aqueous ZIBs. In this study, the authors propose a facile sonochemical method for controlling the interlayer of the vanadate nanofiber crystal structure using poly(3,4‐ethylene dioxythiophene) (PEDOT) to overcome the shortcomings of vanadium oxide‐based materials. In addition, the electrochemical correlation between the interplanar distance of the expanded vanadate layers by the insertion of PEDOT and the behavior of Zn2+ ions is investigated. As a result, the intercalation of the conducting polymer increases the electron pathway and extends the distance of the vanadate layers, which helps to increase the number of active sites inside the vanadate and accelerate the zinc ion intercalation/de‐intercalation process. Their findings may guide research on the next generation of ZIBs that can replace lithium ion batteries.

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“…Lithium vanadium oxide LiV 3 O 8 was tested as cathode material for AZIBs and showed excellent electrochemical performance. [ 177,178 ] LiV 3 O 8 cathode prepared by ball milling followed by annealing displayed discharge specific capacities of 256, 188, and 79 at current densities of 16, 133, and 1066 mA g −1 . [ 177 ] The formation of ZnLiV 3 O 8 and Zn y LiV 3 O 8 structures by insertion of Zn 2+ ions into layered LiV 3 O 8 cathode was confirmed during discharge.…”

Section: Electrolyte Modificationsmentioning

confidence: 99%

“…During charge, Zn y LiV 3 O 8 phase transformed to LiV 3 O 8 with a small modification in the structure (Figure 20d). More recently, He et al [ 178 ] demonstrated a much better performance for LiV 3 O 8 nanorod AZIB cathode. LiV 3 O 8 nanorod cathode exhibited an exceptionally high capacity of 450 mAh g −1 at the current density of 0.1 A g −1 due to the large operating voltage window (0.2–1.6 V vs Zn 2+ /Zn), enabling full discharge/charge, its nanostructured morphology ensuring good electrical conductivity, and its structural stability facilitating Zn 2+ insertion/extraction.…”

Section: Electrolyte Modificationsmentioning

confidence: 99%

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Recent Progress in Layered Manganese and Vanadium Oxide Cathodes for Zn‐Ion Batteries

Bensalah

Luna

2021

Energy Tech

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Aqueous zinc‐ion batteries (AZIBs) are promising candidates for grid‐scale energy‐storage systems, which are essential for maintaining and distributing energy generated from various sources. In contrast to current commercial lithium‐ion batteries (LIBs), AZIBs offer advantages such as, but not limited to, high safety, low cost, and fast kinetics. Zn intercalation material serves as the key element for the suitability of Zn‐ion batteries (ZIBs) for grid and stationary applications. Different materials are tested as cathode materials for ZIBs, including manganese oxides and vanadium oxides. MnO2‐ and V2O5‐based cathodes, in particular, seem compatible with ZIBs, with the potential to perform better than existing batteries in the market. Due to the fast and facile (de)intercalation‐type storage mechanism of Zn2+ ions, layered electrode materials generally have a more stable structure during battery charge and discharge cycles. Materials with large interlayer spacing are expected to exhibit good electrochemical performance, thereby favoring hydrated and cation‐intercalated materials in the development of AZIBs cathodes. Herein, an overview is provided on the synthesis, morphology, and electrochemical performance of various MnO2‐ and V2O5‐based cathode materials in AZIB, as well as the challenges that must be overcome to reach the commercialization of AZIBs.

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Reversible V3+/V5+ double redox in lithium vanadium oxide cathode for zinc storage

Cited by 98 publications

References 42 publications

High‐Voltage Rechargeable Aqueous Zinc‐Based Batteries: Latest Progress and Future Perspectives

High‐Voltage Rechargeable Aqueous Zinc‐Based Batteries: Latest Progress and Future Perspectives

Controlling Vanadate Nanofiber Interlayer via Intercalation with Conducting Polymers: Cathode Material Design for Rechargeable Aqueous Zinc Ion Batteries

Recent Progress in Layered Manganese and Vanadium Oxide Cathodes for Zn‐Ion Batteries

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