In-situ polymerized cross-linked binder for cathode in lithium-sulfur batteries

查看全文 作　　者：Heng [1,2]Ye;Danni [1]Lei;Lu [1]Shen;Bin [1,2]Ni;Baohua [1]Li;Feiyu [1,2]Kang;Yan-Bing [1]He

机构地区：[1]Shenzhen Geim Graphene Center,Graduate School at Shenzhen,Tsinghua University,Shenzhen 518055,China;[2]Laboratory of Advanced Materials,Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Chemical Letters》索引2020年第31卷第2期,共5页

基　　金：supported by the National Natural Science Foundation of China(No.51672156);Guangdong special support program(No.2015TQ01 N401);Guangdong Province Technical Plan Project(Nos.2017B010119001 and 20178090907005);Shenzhen Technical Plan Project(Nos.JCYJ20170412170706047,JCYJ20170307153806471 and GJHS20170314165324888);Shenzhen Graphene Manufacturing Innovation Center(No.201901161513)。 摘　　要：Volume expansion and polysulfide shuttle effect are the main barriers for the commercialization of lithium-sulfur(Li-S) battery.In this work,we in-situ polymerized a cross-linked binder in sulfur cathode to solve the aforementioned problems using a facile method under mild conditions.Polycarbonate diol(PCDL),triethanolamine(TEA) and hexamethylene diisocyanate(HDI) were chosen as precursors to prepare the cross-linked binder.The in-situ polymerized binder(PTH) builds a strong network in sulfur cathode,which could restrain the volume expansion of sulfu r.Moreover,by adopting functional groups of oxygen atoms and nitrogen atoms,the binder could effectively facilitate transportation of Li-ion and adsorb polysulfide chemically.The Li-S battery with bare sulfur and carbon/sulfur composite cathodes and cross-linked PTH binder displays much better electrochemical performance than that of the battery with PVDF.The PTH-bare S cathode with a mass loading of 5.97 mg/cm^2 could deliver a capacity of 733.3 mAh/g at 0.2 C,and remained 585.5 mAh/g after 100 cycles.This in-situ polymerized binder is proved to be quite effective on restraining the volume expansion and suppressing polysulfide shuttle effect,then improving the electrochemical performance of Li-S battery. 关键词：CROSS-LINKED BINDER IN-SITU polymerization Volume expansion of SULFUR Shuttle effect suppression Lithium-sulfur BATTERIES

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In-situ polymerized cross-linked binder for cathode in lithium-sulfur batteries

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