A new ether-based medium-concentrated electrolyte for lithium–sulfur battery with lean Li anode

Kong, Xirui; Kong, Yichen; He, Lang; Zhang, Wenna; Song, Yi; Liu, Sheng; Zhao, Yan

doi:10.1016/j.jpowsour.2022.232211

Cited by 13 publications

(7 citation statements)

References 29 publications

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“…Since the FSI − anions are prone to decompose and form nitrides on the Li surface, the Li 3 N peaks in the N 1s XPS spectra that are associated with F-xSPE20-M2 SPE increased compared to the counterpart. 68 For the F 1s spectra, peaks are seen at 688.6 eV for LiTFSI and at 687.8 eV for LiFSI. These peaks are attributed to the pristine salts or their incomplete decomposition products.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

“…As an inorganic compound with high ionic conductivity, Li 3 N can effectively promote lithium-ion transport and prevent the formation of lithium dendrites. Since the FSI – anions are prone to decompose and form nitrides on the Li surface, the Li 3 N peaks in the N 1s XPS spectra that are associated with F-xSPE20-M2 SPE increased compared to the counterpart . For the F 1s spectra, peaks are seen at 688.6 eV for LiTFSI and at 687.8 eV for LiFSI.…”

Section: Resultsmentioning

confidence: 99%

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Solid Polymer Electrolytes with Dual Anion Synergy and Twofold Reinforcement Effect for All-Solid-State Lithium Batteries

Bandyopadhyay,

Joshi,

Gupta

et al. 2023

ACS Appl. Mater. Interfaces

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Solid polymer electrolytes (SPEs) have emerged as a viable alternative to traditional organic liquid-based electrolytes for high energy density and safer lithium batteries. Poly(ethylene oxide) (PEO)-based SPEs are considered one of the mainstream SPE materials with excellent dissociation ability of lithium salts. However, the inferior ionic conductivity at room temperature and poor dimensional stability at high temperature limit their utilization. In this work, a semi-interpenetrating polymer network (semi-IPN) forming a precursor based on an ionic liquid (IL) monomer and linear PEO chains were introduced into an electrospun poly(acrylonitrile) (PAN) fibrous mat with subsequent thermal-initiated cross-linking. 1,4-Diazabicyclo [2.2.2] octane (DABCO) and 4-(chloromethyl) styrene were used to synthesize the styrenic-DABCO-based IL monomer with bis(trifluoromethane sulfonyl)imide (TFSI–) or bis(fluoromethane sulfonyl)imide (FSI–) as the anion, named as SDTFSI and SDFSI, respectively. Together, the FSI– and TFSI– anions demonstrate a synergistic effect in providing ion-conductive LiF and Li3N-rich inorganic SEI layer with enhanced lithium dendrite suppression ability. The twofold reinforcement effect is achieved collectively from the semi-IPN structure and the three-dimensional (3D) PAN network that help to construct highly efficient and uniform ion transport channels with excellent flexibility, further suppressing the lithium dendrite growth. The SPEs were dimensionally stable even at elevated temperatures of 150 °C. Moreover, the SPEs show an ionic conductivity of 4.4 × 10–4 S cm–1 at 25 °C and 1.81 × 10–3 S cm–1 at 55 °C and a lithium-ion transference number of 0.56. The favorable electrochemical performance of the SPEs was verified by operating LiFePO4/Li and NMC/Li cells.

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Section: ■ Results and Discussionmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Solid Polymer Electrolytes with Dual Anion Synergy and Twofold Reinforcement Effect for All-Solid-State Lithium Batteries

Bandyopadhyay,

Joshi,

Gupta

et al. 2023

ACS Appl. Mater. Interfaces

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show abstract

“…Reproduced with permission. [ 44 ] Copyright 2022, Elsevier. e) The discharge/charge curves of the electrode in 4 M LiFSI/DBE electrolyte; f) Digital photo of the dissolution test of Li 2 S 6 in typicalether solvents by stirring Li 2 S and sulfur in the solvents for 24 h, and the Coulombic efficiency of the Cu‖Li batteries with LiFSI/DBE electrolytes containing various salt concentrations.…”

Section: Electrolytes Design Based On “Solid–liquid–solid” Conversionmentioning

confidence: 99%

“…These phenomena indicate that DBE can effectively inhibit the solubility of LiPSs. Zhao and co‐workers [ 44 ] developed a novel electrolyte with a lower polarity than DME and DOL. Specifically, they mixed tetrahydrofuran (THF) and weakly solvating solvent diisopropyl ether (DIPE), with LiFSI as co‐salt in LiTFSI‐based electrolytes to improve the ionic conductivity (LiTFSI/LiFSI/THF/DIPE, molar ratio 1/3/8/2) (Figure 3d).…”

Section: Electrolytes Design Based On “Solid–liquid–solid” Conversionmentioning

confidence: 99%

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Perspectives of High‐Performance Li–S Battery Electrolytes

Liu,

Zhou,

Yan

et al. 2023

Adv Funct Materials

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Lithium–sulfur batteries with high energy density are considered to be one of the most promising candidates for the next‐generation energy storage devices. Electrolyte as the medium for Li+ transportation between the electrodes, also plays a crucial role in inhibiting the dissolution and diffusion of lithium polysulfides in Li–S batteries. The working mechanism of Li–S batteries in different electrolytes is classified into “solid‐liquid‐solid” and “solid‐solid” conversions. Under the “solid‐liquid‐solid” conversion, Li–S batteries would inevitably face the challenges such as “shuttle effect” that lead to poor cycle performance, and under the “solid‐solid” conversion, they would face interface mismatch that limits the utilization of sulfur with low energy density, while both conversion mechanisms cause uncontrollable Li dendrites on anode. According to the conversion mechanism, electrolytes can be divided into ether‐based, ionic liquid‐based, gel polymer electrolytes, and polymer‐based solid‐state electrolytes with “solid‐liquid‐solid” conversion, as well as carbonate‐based electrolytes and oxide/sulfide‐based solid‐state electrolytes with “solid‐solid” conversion. Based on the conversion mechanism of active materials in different electrolytes, the current status on the strategies from multiple perspectives are summarized to improve the electrochemical performance, with the hope to provide a comprehensive guideline toward the development of suitable electrolytes for Li–S batteries.

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Rational Anion Selection of the Electrolyte Additive for Highly Reversible Lithium Plating/Stripping

Zhu

et al. 2023

Advanced Energy Materials

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Recruiting anions from electrolyte additives into the lithium ion solvation structure is a promising strategy for the construction of long‐lifespan Li‐metal batteries (LMBs). However, inadequate understanding of the anion‐involved Li+ solvation hinders the finding of new anion additives. Herein, using NO3− as an example, the effects of the newly‐introduced anion on the Li+ solvation structure are investigated. It is demonstrated that the added NO3− reduces the electrostatic potential of the Li+ solvation cluster, especially for solvated solvents, which improves electrolyte stability against the Li anode. However, such a conclusion is not universal for all anion additives. It is also confirmed that the anions with higher binding energy and smaller ion size are more apt to improve the Li stability and reversibility. Based on the above understanding, a new selection principle based on anion selection coefficient (the rate of the anion size to the binding energy toward Li+, unit: Å3 eV−1) is proposed, and with which a new hexafluorosilicate anion is found to be beneficial to LMBs.

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A new ether-based medium-concentrated electrolyte for lithium–sulfur battery with lean Li anode

Cited by 13 publications

References 29 publications

Solid Polymer Electrolytes with Dual Anion Synergy and Twofold Reinforcement Effect for All-Solid-State Lithium Batteries

Solid Polymer Electrolytes with Dual Anion Synergy and Twofold Reinforcement Effect for All-Solid-State Lithium Batteries

Perspectives of High‐Performance Li–S Battery Electrolytes

Rational Anion Selection of the Electrolyte Additive for Highly Reversible Lithium Plating/Stripping

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