Fast‐Charging Lithium–Sulfur Batteries Enabled via Lean Binder Content

Kim, Soochan; Kim, Dong Hyun; Cho, Misuk; Lee, Won Bo; Lee, Youngkwan

doi:10.1002/smll.202004372

Cited by 25 publications

(23 citation statements)

References 36 publications

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“…For further applications in conventional organic electrolyte systems, S-MF was evaluated as a separator for lithium-ion batteries (LIBs). LIBs are typical energy storage systems that operate in carbonate- or ether-based organic electrolytes [23] , [24] , [25] .…”

Section: Resultsmentioning

confidence: 99%

Recycling respirator masks to a high-value product: From COVID-19 prevention to highly efficient battery separator

Kim

Yang

Guo

et al. 2022

Chemical Engineering Journal

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COVID-19 is a pandemic that has caused serious disruption in almost every day-to-day life around the world, and wearing a mask is essential for human safety from this virus. However, masks are non-recyclable materials, and the accumulation of masks used every day causes serious environmental issues. In this study, we investigate the recycling of mask materials for addressing the environmental problems and transforming as a high value-added material through chemical modification of masks. The recycled mask is applied as a separator for aqueous rechargeable batteries, and shows outstanding safety and electrochemical performance than the existing separator. This approach will lead to an advanced energy technology considering nature after overcoming COVID-19.

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Section: Resultsmentioning

confidence: 99%

Recycling respirator masks to a high-value product: From COVID-19 prevention to highly efficient battery separator

Kim

Yang

Guo

et al. 2022

Chemical Engineering Journal

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“…Based on the above characterizations, the Li-S cell with WPU-CQD5 was subjected to a long-term cycling test at 2 C, which is the rate at which most portable energy storage devices are evaluated. 9 The results are presented in Figure 5. The Li-S cell exhibited an initial specific capacity of 725 mAh g À1 , which remained at 522 mAh g À1 after 1000 cycles, with only 0.028% capacity retention decay per cycle.…”

Section: Resultsmentioning

confidence: 99%

“…The two representative peaks at 260 and 280 nm are attributed to S 6 2À moieties. 6,9,28 After adding the prepared polymer films and CQDs to the Li 2 S 6 solution, the intensity of the peaks of the S 6 2À moieties decreased considerably. Upon increasing the amount of CQDs in the WPU matrix, the absorbance of the LPS solution containing the polymer films at 260 and 280 nm became less intense, and the color of the solution became paler (Figure S1A).…”

Section: Resultsmentioning

confidence: 99%

“…6,7 LSBs require not only a mechanical regulator, but also an electrochemical regulator to address issues such as shuttle effects. 8,9 Therefore, to replace conventional polymer binders such as poly(acrylic acid) (PAA) and poly(vinylidene fluoride), which are characterized by a low elongation at break and low ability to regulate LPS, functional binders have been developed through various approaches. These approaches include forming composites with functional materials, blending with other polymers, or modifications that add abundant polar groups.…”

Section: Introductionmentioning

confidence: 99%

“…These approaches include forming composites with functional materials, blending with other polymers, or modifications that add abundant polar groups. 5,6,[9][10][11] Unlike conventional polymers, functional polymers with abundant polar groups (such as -COOH, -NH 2 , and -SO 3 À ) efficiently regulate shuttle effects through the chemisorption of LPS by the polar groups, leading to high utilization of the active materials and extended battery performance. 12,13 WPU, a candidate functional polymer, has recently attracted significant attention as an environmentally friendly material and is widely used as a binder, coating, or ink in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

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Aqua‐processable carbon quantum dot–assisted resilient polymer binder for advanced lithium‐sulfur batteries

Kim

et al. 2021

Intl J of Energy Research

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Lithium-sulfur batteries (LSBs) with outstanding theoretical capacity and environmentally friendly properties are regarded as next-generation energy storage devices. However, the shuttle effect of lithium polysulfide (LPS) limits the practical application of LSBs. Herein, we introduce an aqua-processable carbon quantum dot (CQD)-assisted resilient waterborne polyurethane (WPU) network binder for sulfur cathodes. WPU is a well-dispersed colloidal system with abundant polar groups that is suitable for regulating LPS shuttle effects. CQDs were prepared from WPU by hydrothermal treatment. The CQDs enabled facile electron/ion transport, enhanced the adsorption capability of LPS, and formed a robust network. Moreover, the chemical similarity between WPU and CQDs enabled the formation of a well-dispersed system, thereby affording optimal electrochemical performance. The WPU-CQD binder systems exhibited stable cycling performance at a high rate of 2C, with only 0.028% retention decay per cycle over 1000 cycles.

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Ultra‐Low Dosage Lignin Binder for Practical Lithium–Sulfur Batteries

Chen

Qian

et al. 2023

Advanced Energy Materials

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Various synthetic and bioinspired, linear, and 3D network polymeric binders have been developed to suppress the shuttle effect and improve the cyclability of Li-S batteries. [10][11][12][13][14][15] Synthetic binders, such as polyvinylidene fluoride (PVDF), bind conductive materials (carbon black and super P) well via hydrophobic interaction, but they usually show poor adhesion with active materials (S/Li 2 S n ). [16,17] As a comparison, bio-derived binders with functional groups, such as hydroxyl, carboxyl, and amino groups, show the excellent dispersing property to active materials due to the strong dipolar/hydrogen bonding interaction, [13,15,18,19] but the weak interaction with conductive materials still impede their application for sulfur cathodes. In addition, these bio-derived polymer binders are mostly watersoluble (hydrophilic), while the conductive additives are hydrophobic, which is the main obstacle to their interactions. [16,20,21] Few binders match both of the above two binders, and the poor dispersibility of their mixtures usually causes severe aggregation, which makes binders hardly play the role unless the dosage achieves as high as 10 wt% or even in an extreme case of 20 wt%. [22][23][24] Excessive binders in electrodes will limit the battery's energy density and significantly increase the bulk resistance of the whole battery. [21,25,26] In addition, most binders show poor adhesion between active/conductive mixture and current collector, especially after electrolyte wetting, which further increases binder usage. [27] It is urgent to develop binders with broad-spectrum and strong adhesion and good dispersibility to reduce dosages, such as ≤2 wt% as that in commercial Li-S batteries, and improve sulfur utilization, as well as electrochemical stability, and then inspire the theoretical specific energy and high rate performance of Li-S batteries.Fortunately, nature gives us solutions to address previously mentioned issues. As the second most abundant component in plants, lignin is a unique aromatic polymer composed of three p-hydroxyphenylpropane units connected by CO and CC bonds. [28][29][30] Lignin not only binds cellulose with hemicellulose via hydrogen bonding but also plays important role in stress resistance based on its macromolecular aromatic skeleton. [31,32] The distribution and role of lignin in plants are almost the same as those of binders in the cathode of Li-S batteries, which makes lignin an ideal binder candidate for Li-S batteries (Figure 1). Lignin can absorb active materials through carboxyl and hydroxyl groups, interact with conductive additives via the aromatic rings, and constrain the shuttle effect Polymeric binders stabilize lithium-sulfur (Li-S) batteries by suppressing the shuttle of lithium polysulfide (LiPS) and volume variation, but the dosage of state-of-the-art binders in sulfur cathodes (≈20 wt%) hinders the electron/ion transfer and decreases the cell-specific density. Here, a wood-inspired lignin binder is developed after modification with amino acids for pract...

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Fast‐Charging Lithium–Sulfur Batteries Enabled via Lean Binder Content

Abstract: Figure 5. Discharge specific capacities of the Li-S cell with X1C3 binder at the high C rate: a) 2 C, b) 5 C, and c) 10 C.

Cited by 25 publications

References 36 publications

Recycling respirator masks to a high-value product: From COVID-19 prevention to highly efficient battery separator

Recycling respirator masks to a high-value product: From COVID-19 prevention to highly efficient battery separator

Aqua‐processable carbon quantum dot–assisted resilient polymer binder for advanced lithium‐sulfur batteries

Ultra‐Low Dosage Lignin Binder for Practical Lithium–Sulfur Batteries

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