Study of a novel supramolecular hydrogel electrolyte for aqueous zinc ion batteries

Yang, Yingguo; Huang, Chung‐Che; Li, Hui; Teng, Zhaoyang; Zhang, Heng; Wang, Xi; Zhang, Hong; Wu, Lili; Zhang, Chaocan; Chen, Wanyu

doi:10.1039/d3tc01284k

Cited by 6 publications

(2 citation statements)

References 64 publications

(84 reference statements)

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“…There are a lot of studies on AZIBs at room temperature; in contrast, the research on low-temperature electrolytes is relatively scarce. At present, the mainstream strategy is to add some polar solvents, such as DMSO and ethylene glycol (EG), to combine with water, so that these polar molecules destroy the hydrogen bond between H 2 O, weaken the activity of H 2 O, and thus reduce the freezing point of the electrolyte. , DMSO is also often used as a cryogenic solid gel additive, which can re-establish hydrogen bonds between H 2 O and greatly improve the cycle life of solid gels at low temperatures . Phenanthrenequinone macrocyclic trimer has been studied and determined to be the cathode of the EG system, and the battery cycle life is greatly improved.…”

Section: Introductionmentioning

confidence: 99%

“…When the composition of the solvent is changed by adding EG, the electrostatic potential (ESP) of the solvation structure of Zn 2+ is reduced instantly, showing a more stable structure, which is conducive to the binding and conduction of Zn 2+ . 30 Therefore, Zn 2+ is more inclined to combine with EG, so that EG is quickly exchanged around Zn 2+ , effectively reducing the solvation between Zn 2+ and H 2 O, while EG will destroy the hydrogen bond between H 2 O, so that H 2 O will combine with EG, reducing the activity of H 2 O and thereby reducing the freezing point of the electrolyte. On the other hand, Mn 2+ in solution can produce a cationic shield covering the initial zinc tip, effectively avoiding the tip effect and making zinc deposits grow toward the (002) crystal face.…”

Section: Introductionmentioning

confidence: 99%

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Low-Temperature and High-Performance Vanadium-Based Aqueous Zinc-Ion Batteries

Jin,

Ye,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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Aqueous zinc-ion batteries have attracted attention due to their low cost and high safety. Unfortunately, dendrite growth, hydrogen evolution reactions, cathodic dissolution, and other problems are more serious; not only that, but also the cathodic and anodic materials' lattices contract when the temperature drops, and charge transfer and solid phase diffusion become slow, seriously aggravating dendrite growth. At present, there are few studies on the low-temperature system, and studies on retaining high specific capacity are even more rare. Herein, ethylene glycol (EG) and manganese sulfate (MSO) are selected as additives, and the manganese vanadate (MVO) cathode is used to find a high-performance solution at low temperature. MVO can provide higher specific capacity and better structural stability than MnO 2 to adapt to a low-temperature environment. At the same time, Mn 2+ in MSO can produce a cationic shield covering the initial zinc tip at an appropriate concentration to avoid the tip effect and inhibit the dissolution of MVO. EG can not only reduce the freezing point of the electrolyte but also promote the desolvation of [Zn(H 2 O) 6 ] 2+ . The synergistic effect of the three elements prevents the dissolution equilibrium of Mn 2+ in MVO from fluctuating greatly due to the change of temperature. Therefore, when we use EG@0.2 M MnSO 4 + 2 M ZnSO 4 (EG + 0.2Mn/2ZSO) electrolyte at −30 °C, the Zn||Zn batteries which used this type of electrolyte can remain 350 h at 1 mA cm −2 without failure. The Zn||Cu batteries can retain 100% Coulombic efficiency after more than 2000 cycles at 0.2 mA cm −2 . The Zn||MVO battery can reach 231.13 mA h g −1 at its first cycle, and the capacity retention rate is still above 85% after 1000 cycles, which is higher than that of the existing low-temperature research system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-Temperature and High-Performance Vanadium-Based Aqueous Zinc-Ion Batteries

Jin,

Ye,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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Insights Into Electrolyte Strategies for Suppressing Side Reactions Towards Aqueous Zinc‐Ion Batteries

Gong,

Zhang,

Zhang

et al. 2024

Batteries & Supercaps

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Aqueous zinc‐ion batteries (AZIBs) have gained significant attention as a promising technology for grid scale energy storage due to their high safety and low cost. Nevertheless, side reactions on the zinc anodes result in a decrease in efficiency decay and capacity loss, hindering the wide‐spread application of AZIBs. Recently, great efforts have been conducted to tackle these challenges, such as modifying the internal structure of zinc anodes, coating protection on the surface of zinc anodes, and optimizing the electrolytes. However, there is a lack of systematic summary on the design of side reactions‐suppressed zinc anodes, especially through the optimization strategies of aqueous electrolytes. Herein, this review systematically summarizes the main mechanisms and influence factors of side reactions. Subsequently, we present the main modification strategies based on electrolyte engineering for alleviating side reactions, with a particular emphasis on polymer electrolytes. Lastly, we shed light on the potential research directions and perspectives of aqueous electrolytes, which may promote the development of AZIBs.

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