Protic ethers as highly efficient hydrogen-bond regulators for aqueous eutectic electrolytes

Lu, Xuejun; Liu, Zhenhua; Li, Tao; Sun, Hao; Liu, Yulong; Liu, Jian

doi:10.1039/d2ta03053e

Cited by 11 publications

(4 citation statements)

References 37 publications

(63 reference statements)

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“…[48,72,73] On the basis of maintaining the original advantages of individual components and relativity high ionic conductivity, this strategy has the possibility of improving the interface contact between electrodes and electrolytes. [74][75][76][77] In addition, the selection scope of solvents can be significantly broadened and the obviously expanded ESW can meet the requirements of more electrode materials. Unlike the low-temperature organic electrolytes using a small amount and efficient additive, hybrid electrolytes generally employ a certain amount of organic cosolvents to present an obvious effect.…”

Section: Solvent Optimizationmentioning

confidence: 99%

Design Strategies and Recent Advancements for Low‐Temperature Aqueous Rechargeable Energy Storage

Sun

Liu

et al. 2023

Advanced Energy Materials

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Therefore, it is increasingly urgent to develop novel unfrozen aqueous electrolytes to balance electrochemical performance and demand under lowtemperature. Hence, we comprehensively discuss the anti-freezing mechanisms and the composition of low-temperature electrolytes, as well as summarizing recently related reports in a timeline of milestones in the development process of low-temperature ARES (Figure 1a). Inspired by those reported works, how to modulate and optimize the component of aqueous electrolytes to remain unfrozen under ultralow temperature with ideal ionic conductivity is of particular importance to enlarge their application scope.As the ionic transport mediums, electrolytes play a crucial role in ionic migration between cathode and anode electrodes during the electrochemical processes, which are generally composed of appropriate salts and solvents. [12,13] Compared with most frequently-used organic solvents, the high solidification point (0 °C, 1 atm) of pure water as the main solvent for aqueous electrolytes primarily leads to inferior ion transfer under low temperature, restricting the broad application of ARES. [11,14] Thus, understanding the root cause of the abnormal freezing point for water among chalcogen hydrides is an essential precondition to develop lowtemperature aqueous electrolytes. The most apparent difference in various pure chalcogen hydrides is the unique existence of hydrogen bonds (H-bonds) in the pure water system. [15,16] H-bond is the essence of the coordinate bond between lonepair electrons in the strongly electronegativity N, O, or F atoms and hydrogen atom with partial positive charge rather than the shared electron pair effect (Figure 1b). From the chemical composition, the polar water molecules containing two atoms of hydrogen and one atom of oxygen in per chemical formula are H-bonds acceptors and donors at the same time, because the oxygen side with two lone-pair electrons has negative charge and the hydrogen side has positive charge, which provide the condition for H-bonds formation. Subsequently, the viscosity of liquid water increases and H-bonds restrict the vibration of water molecules, boosting the formation of longrange ordered crystalline structure under subzero temperature. Theoretically, one water molecule can effectively interact with up to four nearest neighbor water molecules by H-bonds interaction to generate the self-associated water clusters, which has the short-range ordering in the form of tetrahedral H-bonds within the water clusters due to the sp 3 hybridization of O Aqueous rechargeable energy storage (ARES) has received tremendous attention in recent years due to its intrinsic merits of low cost, high safety, and environmental friendliness. However, the relatively higher freezing point of conventional aqueous electrolytes results in sluggish kinetics and inferior ion transport efficiency under low temperature, severely restricting their further development and practical applications. In order to deal with the existing issues, the design principles ...

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Section: Solvent Optimizationmentioning

confidence: 99%

Design Strategies and Recent Advancements for Low‐Temperature Aqueous Rechargeable Energy Storage

Sun

Liu

et al. 2023

Advanced Energy Materials

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Section: Introductionmentioning

confidence: 99%

“…[1] The realization of such electrodes depends on the choice of raw materials and the design of detailed microstructure, which plays a vital role in practical electrochemical energy storage devices, such as supercapacitors (SCs). [2][3][4][5] However, SCs still suffer disadvantages, such as low energy density, limiting application in electronic devices, and electric vehicles. [6][7][8] Nanostructures with high specific surface area and hierarchical pore size can shorten the ion and electron transport paths and reduce the electrolyte diffusion resistance.…”

Section: Introductionmentioning

confidence: 99%

In Situ Growth of NiCo Layered Double Hydroxide on Biomass Waste‐Based Substrate: A Novel Material with 3D Interconnected Structure as Electrodes for Supercapacitors

Wang

et al. 2022

Energy Tech

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Next‐generation energy storage systems require green and renewable electrodes with a high specific capacity, which combine biomass waste and bimetallic hydroxide synergically to satisfy environmental enhancements and economic benefits. Herein, a novel approach to improving the electrical conductivity of bimetallic materials by in situ growing NiCo layered double hydroxides (LDHs) with pseudocapacitance capability on KMnO4‐activated fungus bran‐derived carbons (FBCs) is reported, achieving improved electrochemical performance in supercapacitors (SCs). The hierarchical porous FBC substrate contributes to the homogeneous growth of the LDHs and high electronic and ionic conductivity. The optimal composite (FBC/NCL‐3) with a 3D interconnected structure provides a specific capacitance of 1938 F g−1 at a current density of 1 A g−1. Correspondingly, the hybrid battery‐SC device composed of FBC/NCL‐3 and FBC provides favorable stability (76% specific capacity retention at 5 A g−1 for 3000 cycles) with an operating voltage of 1.4 V and a high energy density of 37.3 Wh kg−1 at a power density of 695.6 W kg−1. This work demonstrates a promising strategy using FBC as a substrate for growing LDH materials aiming to achieve high‐performance SCs.

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“…Electrolyte systems (with/without water participation) play an irreplaceable role in determining the safety and performance stability of monolithic devices with high adaptability in extreme environments . The eutectic electrolyte, as a liquid mixture of two or more components, presents a melting point (the so-called eutectic point) at a temperature below or close to those of each component, which excellently preserves the liquid state of the electrolyte composition for the potential promotion of investigated MIB devices under sub-zero temperature conditions. , For instance, typical eutectic electrolytes are composed of metal salts and different hydrogen bond donors (HBDs) that encompass a variety of amides and polyols, such as urea, glycerol, ethylene glycol, fructose, erythritol, etc. Thus, the resulting eutectics possess relatively low inherent toxicity, and the non-harmful component utilization highlights the safety of eutectic electrolytes in the environment.…”

mentioning

confidence: 99%

Eutectic Electrolytes Convoying Low-Temperature Metal-Ion Batteries

Qu,

Lu,

Jiang

et al. 2024

ACS Energy Lett.

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Eutectic electrolytes have been widely used in low-temperature metal-ion batteries (MIBs) due to their good performance regardless of seasonal and regional changes. Durable low-temperature MIBs rely on the constitution, proportion, and solvation-structure construction of eutectic electrolytes to maintain high ionic conductivity and electrochemical stability. Despite the rapid advances in eutectic electrolytes, some key issues, including fundamental mechanisms, theoretical models, aqueous/non-aqueous controversies, and challenges at sub-zero temperatures, need to be addressed. This Review first gives an overview of eutectic chemistry by presenting fundamental analysis and proposing new models to demonstrate the variety of interactions and anti-freezing mechanisms. Then, the thermodynamics and mass transfer, Helmholtz electric double-layer configuration, and electrode–electrolyte interphase are discussed to uncover the influence of the eutectic structure on the electrochemistry of low-temperature MIBs. Finally, a summary and perspectives are provided to guide the design principles and requirements of eutectic systems for applications of MIBs in low-temperature scenarios.

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Protic ethers as highly efficient hydrogen-bond regulators for aqueous eutectic electrolytes

Abstract: Aqueous eutectic electrolytes are emerging as the cost-effective and environmental-benign alternatives governing the next-generation electrochemical energy storage (EES) devices. Taking aqueous Li-based eutectic (ALE) electrolyte as an example, it benefits...

Cited by 11 publications

References 37 publications

Design Strategies and Recent Advancements for Low‐Temperature Aqueous Rechargeable Energy Storage

Design Strategies and Recent Advancements for Low‐Temperature Aqueous Rechargeable Energy Storage

In Situ Growth of NiCo Layered Double Hydroxide on Biomass Waste‐Based Substrate: A Novel Material with 3D Interconnected Structure as Electrodes for Supercapacitors

Eutectic Electrolytes Convoying Low-Temperature Metal-Ion Batteries

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