An aqueous magnesium-ion hybrid supercapacitor operated at −50 °C

Yang, Guoshen; Qu, Gangrui; Fang, Chi; Deng, Jie; Xu, Xianqi; Xie, Yinghao; Sun, Tao; Zhu, Yachao; Zheng, Jiaxin; Zhou, Hang

doi:10.1016/j.gee.2022.09.004

Cited by 9 publications

(6 citation statements)

References 57 publications

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“…It was found that the amount of water with a tetrahedral coordination structure that plays a decisive role in ice crystal nucleation also decreased with the increase of the concentration of ZnCl 2 electrolytes (figure 3(f)). A similar phenomenon was also observed in Mg(ClO 4 ) 2 aqueous electrolytes [50]. High-concentration electrolytes reduce the water molecules in the tetrahedral structure, thereby inhibiting the nucleation ability of ice crystals, which will help the electrolyte to operate well at lower temperatures.…”

Section: High-concentration Aqueous Electrolytessupporting

confidence: 66%

Low-temperature electrolytes for electrochemical energy storage devices: bulk and interfacial properties

Yang,

Chen,

et al. 2023

Flex. Print. Electron.

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The optimization of electrochemical energy storage devices (EES) for low-temperature conditions is crucial in light of the growing demand for convenient living in such environments. Sluggish ion transport or the freezing of electrolytes at the electrode-electrolyte interface are the primary factors that limit the performance of EES under low temperatures, leading to fading of capacity and instability in device performance. This review provides a comprehensive overview of antifreeze strategies for various electrolytes (including aqueous electrolytes, organic electrolytes, and ionic liquids), and optimization methods for ion transport at the electrolyte-electrode. Additionally, the main challenges and forward-looking views are highlighted on the design and development of low-temperature electrolytes and EES devices.

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Section: High-concentration Aqueous Electrolytessupporting

confidence: 66%

Low-temperature electrolytes for electrochemical energy storage devices: bulk and interfacial properties

Yang,

Chen,

et al. 2023

Flex. Print. Electron.

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“…Undoubtedly, the mediumconcentration electrolyte seems to be an ideal choice. [45][46][47] As a representative example of NaClO 4 -based electrolyte, the saltingout effect appeared when the broadly-used 17 m electrolyte was stored at 0 °C (Figure 2a) and the 8.85 m electrolyte had a relatively low freezing point of −37 °C (Figure 2b). [9,48] Analogously, the polyaniline//Zn (PANI//Zn) full cell exhibited rapid zinc storage kinetics in the 7.5 m ZnCl 2 electrolyte system rather than the 30 m ZnCl 2 electrolyte under −70 °C.…”

Section: Solute Modificationmentioning

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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“…27,28 Particularly, in aqueous magnesium ion hybrid supercapacitors (MHS), the divalent Mg 2+ can provide two electrons for the electrode materials during intercalation and extraction, 29 bestowing MHS with significant advantages for energy storage. 30,31 Considering the structure of MHS, the reversible ion adsorption/desorption of structurally stable activated carbon (AC) anode materials theoretically possesses a long and excellent cycling life. Therefore, it is crucial to design reasonable cathode materials to match the AC anode for achieving the desired Mg 2+ storage capacity.…”

Section: Introductionmentioning

confidence: 99%

K-birnessite-MnO₂/hollow mulberry-like carbon complexes with stabilized and superior rate performance for aqueous magnesium ion storage

Chen,

Han,

et al. 2024

Dalton Trans.

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An aqueous magnesium-ion hybrid supercapacitor operated at −50 °C

Cited by 9 publications

References 57 publications

Low-temperature electrolytes for electrochemical energy storage devices: bulk and interfacial properties

Low-temperature electrolytes for electrochemical energy storage devices: bulk and interfacial properties

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

K-birnessite-MnO₂/hollow mulberry-like carbon complexes with stabilized and superior rate performance for aqueous magnesium ion storage

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An aqueous magnesium-ion hybrid supercapacitor operated at −50 °C

Cited by 9 publications

References 57 publications

Low-temperature electrolytes for electrochemical energy storage devices: bulk and interfacial properties

Low-temperature electrolytes for electrochemical energy storage devices: bulk and interfacial properties

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

K-birnessite-MnO2/hollow mulberry-like carbon complexes with stabilized and superior rate performance for aqueous magnesium ion storage

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K-birnessite-MnO₂/hollow mulberry-like carbon complexes with stabilized and superior rate performance for aqueous magnesium ion storage