Boosting energy-storage capability in carbon-based supercapacitors using low-temperature water-in-salt electrolytes

Santos, João Pedro Aguiar dos; Pinzón, Manuel; Santos, Érick A.; Vicentini, Rafael; Pagan, C. J. B.; Silva, Leonardo M. Da

doi:10.1016/j.jechem.2022.02.055

Cited by 29 publications

(14 citation statements)

References 36 publications

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“…k) Comparison of cycling stability of SCs in this work and those operated at low temperatures reported in the literature. [ 59–72 ]…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, for the SC operated at low temperature, the capacitance maintains very well and the Coulombic efficiency is above 99% over the whole cycle performance evaluation procedure. It suggests that the side reaction is inhibited, which might be attributed to the sluggish kinetics of the side [59][60][61][62][63][64][65][66][67][68][69][70][71][72] reaction at low temperatures. Moreover, as shown in Figure S9 (Supporting Information), benefiting from the simple cathodic ion adsorption and desorption behavior, there is hardly any structural damage to the active material.…”

Section: Low-temperature Electrochemical Performance Of Supercapacito...mentioning

confidence: 99%

“…Therefore, the SCs with 3.8 m CaCl 2 BRE achieved an unprecedented low-temperature ultralong cycle lifespan, outperforming the other SCs which could be operated below −40 °C in literature, as far as the authors' best knowledge (Figure 3k; Table S2, Supporting Information). [59][60][61][62][63][64][65][66][67][68][69][70][71][72] The SC using 5.2 m NaCl BRE also achieves stable operation at a low temperature of −20 °C (Figure S11, Supporting Information). As shown in Figure S12 (Supporting Information), the SC using 2.8 m MgCl 2 BRE exhibits excellent rate capability and cycling stability at −30 °C.…”

Section: Low-temperature Electrochemical Performance Of Supercapacito...mentioning

confidence: 99%

“…The cyclic stability and Coulombic efficiency at a current density of 1 A g −1 at i) −20 °C, j) −50 °C. k) Comparison of cycling stability of SCs in this work and those operated at low temperatures reported in the literature [59][60][61][62][63][64][65][66][67][68][69][70][71][72].…”

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confidence: 99%

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Brine Refrigerants for Low‐cost, Safe Aqueous Supercapacitors with Ultra‐long Stable Operation at Low Temperatures

You

Yuan

et al. 2022

Adv Funct Materials

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Traditional aqueous energy storage devices are difficult to operate at low temperatures owing to the poor ionic conductivity and sluggish interfacial dynamics in frozen electrolytes. Herein, the low-cost brine refrigerants for food freezing and preservation as electrolytes, and unexpectedly realize high ionic conductivity and stable operation of an aqueous storage device at low temperatures are demonstrated. A CaCl 2 brine refrigerant electrolyte (BRE) with a low freezing point −55 °C and high ionic conductivity (10.1 mS cm −1 at −50 °C) is developed for supercapacitors (SCs), which retains 80% of the room temperature capacity at −50 °C and exhibits ultra-long cycle life with excellent capacity retention of 92% over 98,500 cycles, outperforming the other SCs which can be operated below −40 °C in literature. Moreover, the SCs with MgCl 2 and NaCl BREs can also be operated successfully with excellent cycle stability and high-capacity retention at low temperatures of −30 and −20 °C, respectively. Fundamental correlation between various cations and their effect on the freezing point reduction of aqueous electrolytes is revealed via Raman investigation and molecular dynamics simulations. This study provides a rational design strategy for green, inexpensive, and safe low-temperature aqueous electrolytes for energy storage devices.

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“…k) Comparison of cycling stability of SCs in this work and those operated at low temperatures reported in the literature. [ 59–72 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Low-temperature Electrochemical Performance Of Supercapacito...mentioning

confidence: 99%

Section: Low-temperature Electrochemical Performance Of Supercapacito...mentioning

confidence: 99%

mentioning

confidence: 99%

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Brine Refrigerants for Low‐cost, Safe Aqueous Supercapacitors with Ultra‐long Stable Operation at Low Temperatures

You

Yuan

et al. 2022

Adv Funct Materials

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“…Subsequently, the hydrated salts are prior to be precipitated in the high-concentration electrolytes when the temperature decreases. [42] Thus, the freezing point of the electrolyte exhibits a V-shaped relationship with the solute concentration. Meanwhile, the hydrated ions act as a whole when they migrate between the cathode and anode electrodes.…”

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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The influence of ethylene glycol on the low-temperature electrochemical performance of carbon-based supercapacitors

Zhao,

Wang,

Guliqire

et al. 2024

Ionics

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Boosting energy-storage capability in carbon-based supercapacitors using low-temperature water-in-salt electrolytes

Cited by 29 publications

References 36 publications

Brine Refrigerants for Low‐cost, Safe Aqueous Supercapacitors with Ultra‐long Stable Operation at Low Temperatures

Brine Refrigerants for Low‐cost, Safe Aqueous Supercapacitors with Ultra‐long Stable Operation at Low Temperatures

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

The influence of ethylene glycol on the low-temperature electrochemical performance of carbon-based supercapacitors

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