Understanding the partial substitution effect of Mg in Zn-V aqueous batteries

He, Hanbing; Luo, Zexiang; Liu, Zhen; Zhang, Zhihao; Chen, Yong; Deng, Qingqing; Chen, Xiaobin; Wen-mi, Chen; Zeng, Jing

doi:10.1016/j.jelechem.2022.117094

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…In order to study the electrochemical energy storage mechanism of Mg-VO 2 , ex situ XRD analysis was performed on the electrode in different charge and discharge stages, as shown in Figure a. As the charge and discharge progress, the (110) crystal plane of Mg-VO 2 undergoes a reversible shift, which confirms the reversible insertion/extraction process of Zn 2+ /H + . − In addition, the formation of the Zn 3 V 2 O 7 (OH) 2 ·2H 2 O (PDF#50-0570) phase can be detected during the discharge process. The peak of 12.5 degrees corresponds to the (001) plane of Zn 3 V 2 O 7 (OH) 2 ·2H 2 O, which is consistent with previous reports .…”

Section: Resultsmentioning

confidence: 99%

Achieving Wide-Temperature-Range Sustainable Zinc-Ion Batteries via Magnesium-Doped Cathodes and Gel Electrolytes

Wang,

Liu,

Sun

et al. 2024

ACS Sustainable Chem. Eng.

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The continuous growth of electrification of transportation and grid energy storage applications has driven the demand for broadening the temperature range of electrochemical energy storage batteries. Here, we demonstrate a strategy of magnesium-doped VO2 (Mg-VO2) to adjust the charge density of O and enhance the electrochemical performance of cathode materials at low and high temperatures. At the same time, polyacrylamide (PAM) cross-linked with hydroxyethylcellulose (HEC) (PAM-HEC) is used as an electrolyte to further improve the temperature resistance, and the rechargeable zinc-ion battery assembled with it can stably charge and discharge between −20 and 60 °C. Therefore, the obtained rechargeable zinc-ion battery can cycle charge and discharge for more than 650 h at a current density of 100 mA g–1 at both 60 and −20 °C. Advanced characterization and theoretical calculations reveal the special solvation structure of Zn2+ in PAM-HEC, which results in the excellent performance. The carbonyl group on PAM can chelate with Zn2+ to promote its dissociation, and less solvation water can reduce the side reactions at the electrode–electrolyte interface. Our work proposes an effective strategy for the rational design of wide-temperature-range electrode materials and electrolytes, which can achieve all-weather use of the next generation of secondary zinc-ion batteries.

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Section: Resultsmentioning

confidence: 99%

Achieving Wide-Temperature-Range Sustainable Zinc-Ion Batteries via Magnesium-Doped Cathodes and Gel Electrolytes

Wang,

Liu,

Sun

et al. 2024

ACS Sustainable Chem. Eng.

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Ether−Water Co‐Solvent Electrolytes Enhanced Vanadium Oxide Cathode Cyclic Behaviors for Zinc Batteries

Li,

Jiang,

et al. 2024

ChemSusChem

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Vanadium‐based compounds are fantastic cathodes for aqueous zinc metal batteries due to the high specific capacity and excellent rate capability. Nevertheless, the practical application has been hampered by the dissolution of vanadium in traditional aqueous electrolytes owing to the strong polarity of water molecules. Herein, we propose a hybrid electrolyte made of Zn(ClO4)2 salt in tetraethylene glycol dimethyl ether (G4) and H2O solvents to upgrade the cycle life of Zn//K0.486V2O5 battery. The G4 jointly solvates with Zn2+ ions and replaces a portion of the H2O molecules in the Zn2+ solvation sheath. It forms a strong bond with H2O, reducing its activity, and significantly inhibiting vanadium dissolution and water‐induced parasitic reaction. Consequently, the optimized electrolyte with H2O and G4 volume ratio of 5:5 enhances the cycling stability of Zn//K0.486V2O5 battery, enabling it to reach up to 600 cycles. In addition, the battery demonstrates a satisfactory reversible capacity of 475.7 mAh g‐1 and excellent rate performance attributed to the moderate ionic conductivity (28.8 mS cm‐1) of the hybrid electrolyte. Last but not least, in the optimized electrolyte, the symmetric Zn//Zn cells deliver a long cycling performance of 400 h, while the asymmetric Zn//Cu cells shows a high average coulombic efficiency of 97.4%.

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Understanding the partial substitution effect of Mg in Zn-V aqueous batteries

Cited by 2 publications

References 24 publications

Achieving Wide-Temperature-Range Sustainable Zinc-Ion Batteries via Magnesium-Doped Cathodes and Gel Electrolytes

Achieving Wide-Temperature-Range Sustainable Zinc-Ion Batteries via Magnesium-Doped Cathodes and Gel Electrolytes

Ether−Water Co‐Solvent Electrolytes Enhanced Vanadium Oxide Cathode Cyclic Behaviors for Zinc Batteries

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