High-voltage hydrous electrolytes for electrochemical energy storage

Huang, Miaofeng; Zhen, Siron; Ren, Xiaoliang; Ju, Xin

doi:10.1016/j.jpowsour.2020.228265

Cited by 15 publications

(9 citation statements)

References 23 publications

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“…This strengthens the intermolecular interaction between the PEG chains and thus increases viscosity . Second, the strong H 2 O–crowding agent interaction weakens the hydrogen bond strength of H 2 O–H 2 O, which increases the O–H covalent bond strength of H 2 O, thereby increasing water splitting overpotential and thus improving electrolyte electrochemical voltage window. , This can be tuned by the numbers of functional groups that form strong hydrogen bonds with the water molecules. For the crowding agent, PEG H-(O-CH 2 -CH 2 ) n -OH, it has a repeating unit structure group (-O-CH 2 -CH 2 -), which can form strong hydrogen bond with H 2 O (Figure a) and achieve a 3.2 V voltage window …”

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confidence: 99%

Tuning Intermolecular Interactions of Molecular Crowding Electrolyte for High-Performance Aqueous Batteries

et al. 2021

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Using cost-effective and environmentally friendly molecular crowding agents to replace highly concentrated salts is a promising strategy to suppress water decomposition in electrochemical energy storage devices. However, the lack of comprehensive understanding on how a crowding agent structure affects the key properties of electrolyte prevents rational design of molecular crowding electrolyte for high-power and high-voltage aqueous batteries. Here, we investigated how the terminal group and the chain length of the crowding agent affect the conductivity and the voltage window. On the basis of the design principles revealed, we developed a new crowding agent, polyethylene glycol dimethyl ether (PEGDME) 450, demonstrating 3 times higher conductivity (2.4 mS cm −1 vs 0.8 mS cm −1 ) than state-of-the-art polyethylene glycol (PEG) 400 without sacrificing the voltage window (3.2 V). A high-power and high-voltage aqueous Li 4 Ti 5 O 12 / LiMn 2 O 4 cells with this new electrolyte operated (5 C, 72 Wh kg −1 vs 10 Wh kg −1 PEG400) for 800 cycles. This work demonstrates a universal strategy for advanced aqueous electrolyte design and high-performance batteries.

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confidence: 99%

Tuning Intermolecular Interactions of Molecular Crowding Electrolyte for High-Performance Aqueous Batteries

et al. 2021

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“…The high-voltage aqueous electrolytes typically suffer from high viscosities and sluggish ion diffusion. Specifically, the ion conductivities of WIS electrolytes are usually around B10 mS cm À1 , 29,32,77,78,80,[85][86][87] and for the additivesbased electrolytes, this value is only a few mS cm À1 (0.8-3.376 mS cm À1 ), 30,[81][82][83] which are far from meeting the demand of EES devices requiring the fast charge storage capability like supercapacitors.…”

Section: Optimization Of Ionic Conductivitymentioning

confidence: 99%

“…Subsequently, Huang et al added PEG into the sodium dodecyl sulfate solutions to confine free water molecules. 81 The electrochemical stability window of the electrolyte is expanded to B3 V as water molecules are bonded tightly to the PEG polymer chains via hydrogen bonds.…”

Section: Introducing Water-confined Additivesmentioning

confidence: 99%

Challenges and prospects of high-voltage aqueous electrolytes for energy storage applications

Zhou

Ostrikov

2022

Phys. Chem. Chem. Phys.

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“…As an anion surfactant, sodium dodecyl sulfate (SDS) has been widely used in the petroleum industry, environmental remediation, pharmaceutics, and daily chemicals [ 33 , 34 ]. Additionally, there has been an increasing interest in using SDS as an electrolyte additive for energy storage systems [ 35 , 36 , 37 ]. For example, the dendrite formation and corrosion on Zn anodes can be suppressed by electroplating Zn foils in an aqueous electrolyte containing trace amounts of SDS, presenting Zn‖LiFePO 4 [ 36 ] and Zn‖LMO [ 37 ] batteries with enhanced cycling stability.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the dendrite formation and corrosion on Zn anodes can be suppressed by electroplating Zn foils in an aqueous electrolyte containing trace amounts of SDS, presenting Zn‖LiFePO 4 [ 36 ] and Zn‖LMO [ 37 ] batteries with enhanced cycling stability. Huang and co-workers developed a polyethylene glycol (PEG)-SDS-H 2 O electrolyte for 2.5 V symmetric supercapacitors [ 35 ], in which PEG serves as a water-trapping agent and SDS as a salt to afford ionic conductivity. Hou and co-workers found that an electrolyte with an electrochemical stability window (ESW) of ca.…”

Section: Introductionmentioning

confidence: 99%

Electrolytes with Micelle-Assisted Formation of Directional Ion Transport Channels for Aqueous Rechargeable Batteries with Impressive Performance

Zhang

et al. 2022

Nanomaterials

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Low-cost and ecofriendly electrolytes with suppressed water reactivity and raised ionic conductivity are desirable for aqueous rechargeable batteries because it is a dilemma to decrease the water reactivity and increase the ionic conductivity at the same time. In this paper, Li2SO4–Na2SO4–sodium dodecyl sulfate (LN-SDS)-based aqueous electrolytes are designed, where: (i) Na+ ions dissociated from SDS increase the charge carrier concentration, (ii) DS−/SO42− anions and Li+/Na+ cations are capable of trapping water molecules through hydrogen bonding and/or hydration, resulting in a lowered melting point, (iii) Li+ ions reduce the Krafft temperature of LN-SDS, (iv) Na+ and SO42− ions increase the low-temperature electrolyte ionic conductivity, and (v) SDS micelle clusters are orderly aggregated to form directional ion transport channels, enabling the formation of quasi-continuous ion flows without (r.t.) and with (≤0 °C) applying voltage. The screened LN-SDS is featured with suppressed water reactivity and high ionic conductivity at temperatures ranging from room temperature to −15 °C. Additionally, NaTi2(PO4)3‖LiMn2O4 batteries operating with LN-SDS manifest impressive electrochemical performance at both room temperature and −15 °C, especially the cycling stability and low-temperature performance.

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High-voltage hydrous electrolytes for electrochemical energy storage

Cited by 15 publications

References 23 publications

Tuning Intermolecular Interactions of Molecular Crowding Electrolyte for High-Performance Aqueous Batteries

Tuning Intermolecular Interactions of Molecular Crowding Electrolyte for High-Performance Aqueous Batteries

Challenges and prospects of high-voltage aqueous electrolytes for energy storage applications

Electrolytes with Micelle-Assisted Formation of Directional Ion Transport Channels for Aqueous Rechargeable Batteries with Impressive Performance

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