Influence of Water on Gel Electrolytes for Zinc‐Ion Batteries

Liu, Xiangjie; Li, Xin; Yang, Xiaotong; Lü, Jidong; Zhang, Xuan; Yuan, Du; Zhang, Yizhou

doi:10.1002/asia.202201280

Cited by 17 publications

(7 citation statements)

References 142 publications

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“…Zn 2+ transfer becomes difficult. 55 This correlates with the increased internal resistance shown in Figure 3a. It may also create a larger Zn 2+ concentration gradient from the bulk of the gel electrolyte to electrode/electrolyte interfaces, resulting in uneven deposition and dendrite growth.…”

Section: T H Imentioning

confidence: 60%

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Water and Salt Concentration-Dependent Electrochemical Performance of Hydrogel Electrolytes in Zinc-Ion Batteries

Zhu,

Li,

Zheng

et al. 2024

ACS Appl. Mater. Interfaces

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Zinc-ion batteries (ZIBs) are promising energy storage devices with safe, nonflammable electrolytes and abundant, low-cost electrode materials. Their practical applications are hampered by various water-related undesirable reactions, such as the hydrogen evolution reaction (HER), corrosion of zinc metal, and water-induced decay of cathode materials. Polymer hydrogel electrolytes were used to control these reactions. However, salt, water, and polymeric backbones intervene in polymer hydrogels, and currently, there are no systematic studies on how salt and water concentrations synergistically affect polymer hydrogels' electrochemical performance. Here, we used an in situ polymerization method to synthesize polyacrylamide (PAM) hydrogels with varied Zn(ClO 4 ) 2 (0.5 to 2.0 mol kg −1 ) and water (40 to 90 wt %) concentrations. Their electrochemical performances in Zn||Ti half-cells, Zn||Zn symmetrical cells, and Zn||V 2 O 5 full cells have been comprehensively evaluated. Although the ionic conductivity of electrolytes increases with the salt concentration, a high salt concentration of 2.0 mol kg −1 with more Zn 2+ solvated H 2 O would induce more severe HER and Zn corrosion at the electrolyte/ electrode interfaces. A narrow window of the water concentration at 70−80 wt % is optimal to balance needs for achieving a high ionic conductivity and restricting water-related undesirable reactions. The chemically more active water counts roughly 64.1−73.1 wt % of the total water in electrolytes. PAM hydrogel electrolyte with 1.0 mol kg −1 Zn(ClO 4 ) 2 and 80 wt % water enables 1200 h of stable cycling in a Zn||Zn symmetric cell and 99.24% of Coulombic efficiency in a Zn||Ti half-cell. Due to the water-induced decay of V 2 O 5 , the electrolyte with 70 wt % water delivers the best performance in a Zn||V 2 O 5 full cell, which can retain 73.7% of its initial capacity after 400 charge/discharge cycles. Our results show that achieving precise control of salt and water concentrations of hydrogel electrolytes in their optimal windows to reduce the fraction of chemically more active water while retaining high ionic conductivity is essential to enabling high-performance ZIBs.

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Section: T H Imentioning

confidence: 60%

“…When the active water fraction is too low (i.e., in HE-S1-W60), 45.7% of the water is bonded with polymeric backbones. Zn 2+ transfer becomes difficult . This correlates with the increased internal resistance shown in Figure a.…”

Section: Resultsmentioning

confidence: 87%

Water and Salt Concentration-Dependent Electrochemical Performance of Hydrogel Electrolytes in Zinc-Ion Batteries

Zhu,

Li,

Zheng

et al. 2024

ACS Appl. Mater. Interfaces

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“…Gel polymer electrolyte is usually composed of the polymer as a skeleton with a uniformly dispersed liquid solution [164]. Consequently, the GPE has all the advantages of both the liquid electrolyte and the solid electrolyte [165,166]. The liquid in the GPE can make a great contribution to the ionic conductivity and interface stability, and at the same time, the polymer part can provide relatively strong mechanical properties and a certain flexibility to the GPE [167].…”

Section: Gel Polymer Electrolytesmentioning

confidence: 99%

Research progress on the design of electrolyte additives and their functions for zinc-ion batteries

Cui,

Zhang,

Yang

et al. 2024

Mater. Futures

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In recent years, zinc-ion batteries (ZIBs) have been considered one of the most promising candidates for next-generation electrochemical energy storage systems due to their advantages of high safety, high specific capacity, and high economic efficiency. As an indispensable component, the electrolyte has the function of connecting the cathode and the anode, and play a key role on the performance of the battery. Different types of electrolytes have different effects on the performance of ZIBs, and the use of additives has further developed the research on modified electrolytes, thus effectively solving many serious problems faced by ZIBs. Therefore, to further explore the improvement of ZIBs by electrolyte engineering, it is necessary to summarize the current status of various electrolyte additives design, as well as their functions and mechanism in ZIBs. This paper analyzes the challenges faced by different electrolytes, reviews the different solutions of additives to solve battery problems in liquid electrolytes and solid electrolytes, and finally makes suggestions for the development of modified ZIBs electrolytes. It is hoped that the review and strategies proposed in this paper will facilitate development of new electrolyte additives for ZIBs.

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“…Gel electrolytes have been greatly developed for flexible AZIBs [137] , which enhances the excellent cycle durability of batteries [138][139][140] . Further, the incorporation of solid or gel-based electrolytes in battery technology has been demonstrated to mitigate the formation of Zn dendrites [141,142] .…”

Section: Electrolyte Regulationmentioning

confidence: 99%

Recent development in addressing challenges and implementing strategies for manganese dioxide cathodes in aqueous zinc ion batteries

Luo,

Lei,

Xiao

et al. 2024

Energy Mater

Self Cite

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Safety issues of energy storage devices in daily life are receiving growing attention, together with resources and environmental concerns. Aqueous zinc ion batteries (AZIBs) have emerged as promising alternatives for extensive energy storage due to their ultra-high capacity, safety, and eco-friendliness. Manganese-based compounds are key to the functioning of AZIBs as the cathode materials thanks to their high operating voltage, substantial charge storage capacity, and eco-friendly characteristics. Despite these advantages, the development of high-performance Mn-based cathodes still faces the critical challenges of structural instability, manganese dissolution, and the relatively low conductivity. Primarily, the charge storage mechanism of manganese-based AZIBs is complex and subject to debate. In view of the above, this review focuses on the mostly investigated MnO2-based cathodes and comprehensively outlines the charge storage mechanisms of MnO2-based AZIBs. Current optimization strategies are systematically summarized and discussed. At last, the perspectives on elucidating advancing MnO2 cathodes are provided from the mechanistic, synthetic, and application-oriented aspects.

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Influence of Water on Gel Electrolytes for Zinc‐Ion Batteries

Cited by 17 publications

References 142 publications

Water and Salt Concentration-Dependent Electrochemical Performance of Hydrogel Electrolytes in Zinc-Ion Batteries

Water and Salt Concentration-Dependent Electrochemical Performance of Hydrogel Electrolytes in Zinc-Ion Batteries

Research progress on the design of electrolyte additives and their functions for zinc-ion batteries

Recent development in addressing challenges and implementing strategies for manganese dioxide cathodes in aqueous zinc ion batteries

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