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A viscous oligomer multifunctional separator coating to enable high specific energy lithium-sulfur battery

Lithium-sulfur (Li–S) batteries, with high energy density (2600 Wh/kg), are emerging as one of the most potential battery systems. However, the challenges posed by Li dendrite formation and polysulfide shuttling have impeded their commercialization. To address these issues, we develop a multifunctio...

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Published in:Ionics 2024, Vol.30 (6), p.3223-3229
Main Authors: Hu, Lina, Wang, Xuhui, Bai, Maohui, Song, Hongjia, Fu, Zhao, Zhong, Xiangli, Wang, Jinbin
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creator Hu, Lina
Wang, Xuhui
Bai, Maohui
Song, Hongjia
Fu, Zhao
Zhong, Xiangli
Wang, Jinbin
description Lithium-sulfur (Li–S) batteries, with high energy density (2600 Wh/kg), are emerging as one of the most potential battery systems. However, the challenges posed by Li dendrite formation and polysulfide shuttling have impeded their commercialization. To address these issues, we develop a multifunctional separator featuring poly(methyl methacrylate) (PMMA) polymer coatings (PP@PMMA), synthesized via in-situ bond opening polymerization of oligomers catalyzed by Li + ions. This approach allows for the uniform application of the viscous PMMA oligomer onto the separator without requiring additional binders. Furthermore, the diffusion of liquid polysulfide is inhibited by the strong chemical bonding between the carbonyl group of PMMA gel polymer electrolyte (GPE) and lithium sulfide. Additionally, it also enhances the adsorption of solvents and promotes Li-ion conduction, thereby increasing the ion concentration of the interface layer and inhibiting the growth of dendrites. As a result, the Li||Li symmetric cell with PP@PMMA separator exhibits stable cycling for 1000 h, and the Li|Cu asymmetric cell achieves an average coulomb efficiency of 98.2% over 300 cycles. When applied to the 5000 mAh high specific energy Li–S pouch cell, the Li–S pouch cell with PP@PMMA can obtain a capacity retention rate of 97.6% after 100 cycles, while pristine Li–S battery is fully effective after only 35 cycles. Moreover, the optimized separator also mitigates self-discharge in Li–S batteries, and the storage capacity of 120 h is improved by 22%. The multifunctional separator can not only be applied in Li metal batteries but also promote the practical application of other Li-ion secondary batteries.
doi_str_mv 10.1007/s11581-024-05531-3
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subjects Bonding strength
Carbonyl groups
Carbonyls
Chemical bonds
Chemistry
Chemistry and Materials Science
Commercialization
Condensed Matter Physics
Effectiveness
Electrochemistry
Energy Storage
Ion concentration
Lithium
Lithium batteries
Lithium ions
Lithium sulfur batteries
Oligomers
Optical and Electronic Materials
Polymer coatings
Polymers
Polymethyl methacrylate
Polysulfides
Rechargeable batteries
Renewable and Green Energy
Separators
Specific energy
Storage batteries
Storage capacity
title A viscous oligomer multifunctional separator coating to enable high specific energy lithium-sulfur battery
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