Covalent organic frameworks (COF)/CNT nanocomposite for high performance and wide operating temperature lithium–sulfur batteries

Lithium-sulfur (Li–S) batteries as the most promising rechargeable batteries are still facing severe challenges, such as fast capacity fade, poor cycling stability, and low sulfur utilization, mainly due to the dissolution/migration of soluble reaction intermediates during cycling. Here, a novel fun...

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Veröffentlicht in:Energy (Oxford) 2020-05, Vol.199, p.117372, Article 117372
Hauptverfasser: Wang, Jianyi, Qin, Weiwei, Zhu, Xixi, Teng, Yongqiang
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Qin, Weiwei
Zhu, Xixi
Teng, Yongqiang
description Lithium-sulfur (Li–S) batteries as the most promising rechargeable batteries are still facing severe challenges, such as fast capacity fade, poor cycling stability, and low sulfur utilization, mainly due to the dissolution/migration of soluble reaction intermediates during cycling. Here, a novel functionalized separator has been designed to trap the dissolved polysulfide by the facile strategy of functional coated separator which combining covalent organic frameworks with interlude Carbon Nanotubes network (COF-CNT-separator). Notably, it acts as an ionic sieve in Li–S batteries and a house for polysulfide, which selectively sieves Li+ ions and successfully confine the polysulfide within the cathode region. The battery exhibited a high reversible capacity of 1068 mAh g−1 at 1 A g−1 after the first cycle and capacity of 621 mAh g−1 after 500 cycles (sulfur content of 80% in cathode). When its high and low temperature performance were investigated, it finds that Li–S battery is suitable for a wide range of temperatures, from −10 to 50 °C, delivering a high utilization rate of sulfur, an excellent rate and cycle performance, and outstanding life cycle. Therefore, this facile strategy of combining separator with special network is an effective candidate for achieving high performance Li–S batteries. [Display omitted] •COFs/CNT, which was used for separator modification, was prepared by a simple way.•COFs can adsorb polysulfide, and CNT has good electrical and ionic conductivity.•COFs/CNT can selectively sieve Li+ ions and block the passage of polysulfide.•The COFs/CNT based LSBs shows excellent performance in a wide temperature range.•COFs/CNT modified separator shows great potential for commercialization of LSBs.
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Here, a novel functionalized separator has been designed to trap the dissolved polysulfide by the facile strategy of functional coated separator which combining covalent organic frameworks with interlude Carbon Nanotubes network (COF-CNT-separator). Notably, it acts as an ionic sieve in Li–S batteries and a house for polysulfide, which selectively sieves Li+ ions and successfully confine the polysulfide within the cathode region. The battery exhibited a high reversible capacity of 1068 mAh g−1 at 1 A g−1 after the first cycle and capacity of 621 mAh g−1 after 500 cycles (sulfur content of 80% in cathode). When its high and low temperature performance were investigated, it finds that Li–S battery is suitable for a wide range of temperatures, from −10 to 50 °C, delivering a high utilization rate of sulfur, an excellent rate and cycle performance, and outstanding life cycle. Therefore, this facile strategy of combining separator with special network is an effective candidate for achieving high performance Li–S batteries. [Display omitted] •COFs/CNT, which was used for separator modification, was prepared by a simple way.•COFs can adsorb polysulfide, and CNT has good electrical and ionic conductivity.•COFs/CNT can selectively sieve Li+ ions and block the passage of polysulfide.•The COFs/CNT based LSBs shows excellent performance in a wide temperature range.•COFs/CNT modified separator shows great potential for commercialization of LSBs.</description><identifier>ISSN: 0360-5442</identifier><identifier>EISSN: 1873-6785</identifier><identifier>DOI: 10.1016/j.energy.2020.117372</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Batteries ; Carbon nanotubes ; Cathode region ; Covalent organic framework ; Cycles ; High energy density ; Intermediates ; Life cycle assessment ; Life cycles ; Lithium ; Lithium ions ; Lithium sulfur batteries ; Low temperature ; Nanocomposites ; Nanotechnology ; Nanotubes ; Operating temperature ; Polysulfides ; Rechargeable batteries ; Separator modified ; Separators ; Sieves ; Sulfur ; Sulfur content ; Temperature performance</subject><ispartof>Energy (Oxford), 2020-05, Vol.199, p.117372, Article 117372</ispartof><rights>2020 Elsevier Ltd</rights><rights>Copyright Elsevier BV May 15, 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c400t-2d7ba9aef0156a0c9f2e01bd8d6a630d5b83c55919248b06041597cb11ae88063</citedby><cites>FETCH-LOGICAL-c400t-2d7ba9aef0156a0c9f2e01bd8d6a630d5b83c55919248b06041597cb11ae88063</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.energy.2020.117372$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Wang, Jianyi</creatorcontrib><creatorcontrib>Qin, Weiwei</creatorcontrib><creatorcontrib>Zhu, Xixi</creatorcontrib><creatorcontrib>Teng, Yongqiang</creatorcontrib><title>Covalent organic frameworks (COF)/CNT nanocomposite for high performance and wide operating temperature lithium–sulfur batteries</title><title>Energy (Oxford)</title><description>Lithium-sulfur (Li–S) batteries as the most promising rechargeable batteries are still facing severe challenges, such as fast capacity fade, poor cycling stability, and low sulfur utilization, mainly due to the dissolution/migration of soluble reaction intermediates during cycling. 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subjects Batteries
Carbon nanotubes
Cathode region
Covalent organic framework
Cycles
High energy density
Intermediates
Life cycle assessment
Life cycles
Lithium
Lithium ions
Lithium sulfur batteries
Low temperature
Nanocomposites
Nanotechnology
Nanotubes
Operating temperature
Polysulfides
Rechargeable batteries
Separator modified
Separators
Sieves
Sulfur
Sulfur content
Temperature performance
title Covalent organic frameworks (COF)/CNT nanocomposite for high performance and wide operating temperature lithium–sulfur batteries
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