Why PEO as a binder or polymer coating increases capacity in the Li–S system

Lacey, Matthew J.; Jeschull, Fabian; Edström, Kristina; Brandell, Daniel

doi:10.1039/c3cc44772c

Cited by 106 publications

(87 citation statements)

References 23 publications

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“…The abovementioned linear binders such as PEO, [76] PVA, [44] PEI, [77] and CMC, [30] also show polysulfide-anchoring ability because of the existence of the lone electron pairs on O and N of the molecules. The abovementioned linear binders such as PEO, [76] PVA, [44] PEI, [77] and CMC, [30] also show polysulfide-anchoring ability because of the existence of the lone electron pairs on O and N of the molecules.…”

Section: Immobilization Of Polysulfidementioning

confidence: 99%

Rational Design of Binders for Stable Li‐S and Na‐S Batteries

Guo

Zheng

2019

Adv Funct Materials

128

111

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Binders play a critical role in stabilizing the sulfur cathode of Li-S and Na-S batteries. Over the past decade, the design of binder molecules has gone through tremendous evolution from primarily maintaining the structural integrity of the electrode against volume change to rationally immobilizing polysulfide intermediate and facilitating electron/ion transport in the charge and discharge process. This article reviews the development of binder for Li-S and Na-S batteries from the perspective of molecular design, and comprehensively discusses the correlation between the functions of the binder molecules and the cell performance. It also points out the future challenge and the potential solutions to address them. Figure 2. Timeline of the development of binders in terms of specific functions in Li-S and Na-S batteries. The binder in Li-S batteries has experienced a remarkable evolution in terms of functions, from fundamental structural and mechanical stabilizer (linear, hybrid, [30] dendrimer, [31] and crossedlinked binder [32,33] ) to versatile functions of polysulfide immobilization (polymer with functional groups [34][35][36] or cation groups [37] ) and facilitation of electron transport on the basis of conductive polymer. [38,39] It opens up the research of multifunctional binder. The analogous development route in the binder is found in Na-S batteries. [40,41] Reproduced with permission. [30]

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Section: Immobilization Of Polysulfidementioning

confidence: 99%

Rational Design of Binders for Stable Li‐S and Na‐S Batteries

Guo

Zheng

2019

Adv Funct Materials

128

111

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“…To tackle these problems, polymer-based strategies have recently demonstrated encouraging potential with the success of a polymer binder and separators in Li-S batteries. Multifunctional polymer binders such as gum arabic, 10 gelatin 11 and PEO, 12 among others, have demonstrated great effectiveness in maintaining electrode integrity and in confining PSs within the cathodic chamber, whereas the use of a functionalized polymer separator also revealed significant PS shuttle suppression by blocking the penetration of the PS to the anode. 13,14 Polybenzimidazole (PBI) (Scheme 1), which has a high melting point, has been extensively used in high-performance protective applications such as firefighter implements, astronaut space suits and aircraft wall fabrics, among others, owing to its superior stability and retention of mechanical strength at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

The dual actions of modified polybenzimidazole in taming the polysulfide shuttle for long-life lithium–sulfur batteries

Wang

Cai

et al. 2016

NPG Asia Mater

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The development of lithium-sulfur (Li-S) batteries is of practical significance to meet the rapidly escalating demand for advanced energy storage technologies with long life and high-energy density. However, the dissolution and shuttling of the intermediate polysulfides (PS) initiates the loss of active sulfur and the poisoning of the lithium anode, leading to unsatisfactory cyclability and consequently hinders the commercialization of Li-S batteries. Herein, we develop a facile strategy to tame the PS dissolution and the shuttling effect in the Li-S system by introducing a modified polybenzimidazole (mPBI) with multiple functions. As a binder, the excellent mechanical property of mPBI endows the sulfur electrode with strong integrity and, therefore, results in high sulfur loading (7.2 mg cm − 2 ), whereas the abundant chemical interaction between mPBI and PS affords efficient PS adsorption to inhibit sulfur loss and prolong battery life. As a functional agent for the separator, the mPBI builds a PS shield onto the separator to block PS's migration to further suppress the PS shuttling. The dual actions of mPBI confer an excellent performance of 750 mAh g − 1 (or 5.2 mAh cm − 2 ) after 500 cycles at C/5 on the Li-S battery with an ultralow capacity fading rate of 0.08% per cycle.

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The binder is an important ingredient in battery functions to bond and keep the active materials in the electrode, which helps to improve electrical contact between the active materials and conductive carbon as well as to link the active materials with the current collector. [24][25][26][27][28] For example, polyvinylidene fluoride (PVDF) is typically used as a conventional binder for Li-S batteries. [24][25][26][27][28] For example, polyvinylidene fluoride (PVDF) is typically used as a conventional binder for Li-S batteries.

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confidence: 99%

A New Type of Multifunctional Polar Binder: Toward Practical Application of High Energy Lithium Sulfur Batteries

et al. 2017

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A new type of amino polar binder with 3D network flexibility structure for high energy Li-S batteries is synthesized and successfully used with commercial sulfur powder cathodes. The binder shows significant performance improvement in capacity retention and high potential for practical application, which arouse the battery community's interest in the commercial application of high energy Li-S battery.

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Why PEO as a binder or polymer coating increases capacity in the Li–S system

Cited by 106 publications

References 23 publications

Rational Design of Binders for Stable Li‐S and Na‐S Batteries

Rational Design of Binders for Stable Li‐S and Na‐S Batteries

The dual actions of modified polybenzimidazole in taming the polysulfide shuttle for long-life lithium–sulfur batteries

A New Type of Multifunctional Polar Binder: Toward Practical Application of High Energy Lithium Sulfur Batteries

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