Conductive Polymer Coated Layered Double Hydroxide as a Novel Sulfur Reservoir for Flexible Lithium‐Sulfur Batteries

Lithium‐sulfur battery (LSB) is widely regarded as the most promising next‐generation energy storage system owing to its high theoretical capacity and low cost. However, the practical application of LSBs is mainly hampered by the low electronic conductivity of the sulfur cathode and the notorious “s...

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Veröffentlicht in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2023-07, Vol.19 (30), p.e2300843-n/a
Hauptverfasser: Dong, Hanghang, Qi, Shuo, Wang, Lei, Chen, Xianfei, Xiao, Yao, Wang, Yong, Sun, Bing, Wang, Guoxiu, Chen, Shuangqiang
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container_issue 30
container_start_page e2300843
container_title Small (Weinheim an der Bergstrasse, Germany)
container_volume 19
creator Dong, Hanghang
Qi, Shuo
Wang, Lei
Chen, Xianfei
Xiao, Yao
Wang, Yong
Sun, Bing
Wang, Guoxiu
Chen, Shuangqiang
description Lithium‐sulfur battery (LSB) is widely regarded as the most promising next‐generation energy storage system owing to its high theoretical capacity and low cost. However, the practical application of LSBs is mainly hampered by the low electronic conductivity of the sulfur cathode and the notorious “shuttle effect”, which lead to high voltage polarization, severe over‐charge behavior, and rapid capacity decay. To address these issues, a novel sulfur reservoir is synthesized by coating polypyrrole (PPy) thin film on hollow layered double hydroxide (LDH) (PPy@LDH). After compositing with sulfur, such PPy@LDH‐S cathode shows a multi‐functional effect to reserve lithium polysulfides (LiPSs). In addition, the unique architecture provides sufficient inner space to encapsulate the volume expansion and enhances the reaction kinetics of sulfur‐based redox chemistry. Theoretical calculations have illustrated that the PPy@LDH has shown stronger chemical adsorption capability for LiPSs than those of porous carbon and LDH, preventing the shuttling of LiPSs and enhancing the nucleation affinity of liquid‐solid conversion. As a result, the PPy@LDH‐S electrode delivers a stable cycling performance and a superior rate capability. Flexible battery has demonstrated this PPy@LDH‐S electrode can work properly with treatments of bending, folding, and even twisting, paving the way for wearable devices and flexible electronics. The flexible PPy coating on LDH layers realizes complete physical confinement and strong chemical absorption to LiPSs. Theoretical calculations, in situ XRD, and Raman measurements of PPy@LDH‐S electrode have illustrated PPy@LDH has stronger chemical adsorption capability to LiPSs. For practical application, pouch cells fabricated by PPy@LDH‐S electrode can work properly under bending, folding, and even twisting situations.
doi_str_mv 10.1002/smll.202300843
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However, the practical application of LSBs is mainly hampered by the low electronic conductivity of the sulfur cathode and the notorious “shuttle effect”, which lead to high voltage polarization, severe over‐charge behavior, and rapid capacity decay. To address these issues, a novel sulfur reservoir is synthesized by coating polypyrrole (PPy) thin film on hollow layered double hydroxide (LDH) (PPy@LDH). After compositing with sulfur, such PPy@LDH‐S cathode shows a multi‐functional effect to reserve lithium polysulfides (LiPSs). In addition, the unique architecture provides sufficient inner space to encapsulate the volume expansion and enhances the reaction kinetics of sulfur‐based redox chemistry. Theoretical calculations have illustrated that the PPy@LDH has shown stronger chemical adsorption capability for LiPSs than those of porous carbon and LDH, preventing the shuttling of LiPSs and enhancing the nucleation affinity of liquid‐solid conversion. As a result, the PPy@LDH‐S electrode delivers a stable cycling performance and a superior rate capability. Flexible battery has demonstrated this PPy@LDH‐S electrode can work properly with treatments of bending, folding, and even twisting, paving the way for wearable devices and flexible electronics. The flexible PPy coating on LDH layers realizes complete physical confinement and strong chemical absorption to LiPSs. Theoretical calculations, in situ XRD, and Raman measurements of PPy@LDH‐S electrode have illustrated PPy@LDH has stronger chemical adsorption capability to LiPSs. 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However, the practical application of LSBs is mainly hampered by the low electronic conductivity of the sulfur cathode and the notorious “shuttle effect”, which lead to high voltage polarization, severe over‐charge behavior, and rapid capacity decay. To address these issues, a novel sulfur reservoir is synthesized by coating polypyrrole (PPy) thin film on hollow layered double hydroxide (LDH) (PPy@LDH). After compositing with sulfur, such PPy@LDH‐S cathode shows a multi‐functional effect to reserve lithium polysulfides (LiPSs). In addition, the unique architecture provides sufficient inner space to encapsulate the volume expansion and enhances the reaction kinetics of sulfur‐based redox chemistry. Theoretical calculations have illustrated that the PPy@LDH has shown stronger chemical adsorption capability for LiPSs than those of porous carbon and LDH, preventing the shuttling of LiPSs and enhancing the nucleation affinity of liquid‐solid conversion. 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subjects Cathodes
Cathodic polarization
Conducting polymers
conductive polymers
Electrode polarization
Electrodes
Energy storage
flexible batteries
Flexible components
Hydroxides
layered double hydroxide
Lithium
Lithium sulfur batteries
Nanotechnology
Nucleation
Polymer coatings
Polypyrroles
Reaction kinetics
Reservoirs
theoretical calculations
Thin films
Wearable technology
title Conductive Polymer Coated Layered Double Hydroxide as a Novel Sulfur Reservoir for Flexible Lithium‐Sulfur Batteries
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