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Twinborn TiO2-TiN heterostructures enabling smooth trapping-diffusion-conversion of polysulfides towards ultralong life lithium-sulfur batteries
Zhou, Tianhong; Lv, Wei; Li, Jia; Zhou, Guangmin; Zhao, Yan; Fan, Shaoxun; Liu, Bilu; Li, Baohua; Kang, Feiyu; Yang, Quan-Hong; Lv, W; Li, BH; Yang, QH (reprint author), Tsinghua Univ, Shenzhen Key Lab Graphene Based Mat & Engn, Lab Functionalized Carbon Mat, Grad Sch Shenzhen, Shenzhen 518055, Peoples R China.; Yang, QH (reprint author), Tsinghua Univ, TBSI, Shenzhen 518055, Peoples R China.; Yang, QH (reprint author), Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China.
2017-07-01
Source PublicationENERGY & ENVIRONMENTAL SCIENCE
ISSN1754-5692
Volume10Issue:7Pages:1694-1703
AbstractThe practical use of lithium-sulfur (Li-S) batteries is largely hindered by their poor cycling stability because of the shuttling of soluble lithium polysulfides (LiPSs) in a slow redox reaction. Physical and chemical confinement by carbon or noncarbon hosts has been used to block LiPS shuttling, but this may only be a complete solution to the problem if it combines with LiPS fast conversion into an insoluble sulfide. Here we report a twinborn TiO2-TiN heterostructure that combines the merits of highly adsorptive TiO2 with conducting TiN and achieves smooth trapping-diffusion-conversion of LiPSs across the interface. TiO2 has high adsorption for LiPSs while TiN promotes their conversion into insoluble Li2S. The fast diffusion of LiPSs from TiO2 to TiN helps achieve both high trapping efficiency and fast conversion. By loading such a heterostructure onto graphene, which acts as a physical barrier, a compact and thin coating is fabricated on the separator, and LiPS shuttling is greatly restrained even with a high sulfur loading. A capacity of 927 mA h g(-1) after 300 cycles is obtained under a low current density of 0.3C. Over 2000 cycles, capacity retentions of 73% and 67% at 1C are achieved for sulfur loadings of 3.1 and 4.3 mg cm(-2). Such an interlayer is expected to promote the practical use of Li-S batteries because of the simple processing and the resulting outstanding capacity and cyclic performance. Such a heterostructure suggests a new way to produce multifunctional interlayers that improve the performance of energy storage devices.; The practical use of lithium-sulfur (Li-S) batteries is largely hindered by their poor cycling stability because of the shuttling of soluble lithium polysulfides (LiPSs) in a slow redox reaction. Physical and chemical confinement by carbon or noncarbon hosts has been used to block LiPS shuttling, but this may only be a complete solution to the problem if it combines with LiPS fast conversion into an insoluble sulfide. Here we report a twinborn TiO2-TiN heterostructure that combines the merits of highly adsorptive TiO2 with conducting TiN and achieves smooth trapping-diffusion-conversion of LiPSs across the interface. TiO2 has high adsorption for LiPSs while TiN promotes their conversion into insoluble Li2S. The fast diffusion of LiPSs from TiO2 to TiN helps achieve both high trapping efficiency and fast conversion. By loading such a heterostructure onto graphene, which acts as a physical barrier, a compact and thin coating is fabricated on the separator, and LiPS shuttling is greatly restrained even with a high sulfur loading. A capacity of 927 mA h g(-1) after 300 cycles is obtained under a low current density of 0.3C. Over 2000 cycles, capacity retentions of 73% and 67% at 1C are achieved for sulfur loadings of 3.1 and 4.3 mg cm(-2). Such an interlayer is expected to promote the practical use of Li-S batteries because of the simple processing and the resulting outstanding capacity and cyclic performance. Such a heterostructure suggests a new way to produce multifunctional interlayers that improve the performance of energy storage devices.
description.department[zhou, tianhong ; lv, wei ; li, jia ; zhao, yan ; fan, shaoxun ; li, baohua ; kang, feiyu ; yang, quan-hong] tsinghua univ, shenzhen key lab graphene based mat & engn, lab functionalized carbon mat, grad sch shenzhen, shenzhen 518055, peoples r china ; [zhou, tianhong ; zhao, yan ; fan, shaoxun ; kang, feiyu] tsinghua univ, adv mat lab, sch mat sci & engn, beijing 100084, peoples r china ; [zhou, guangmin] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china ; [liu, bilu ; kang, feiyu ; yang, quan-hong] tsinghua univ, tbsi, shenzhen 518055, peoples r china ; [yang, quan-hong] tianjin univ, sch chem engn & technol, tianjin 300072, peoples r china
Subject AreaChemistry, Multidisciplinary ; Energy & Fuels ; Engineering, Chemical ; Environmental Sciences
Funding OrganizationNational Science Fund for Distinguished Young Scholars, China [51525204]; National Key Basic Research Program of China [2014CB932400]; National Natural Science Foundation of China [U1601206, U1401243, 51232005]; Shenzhen Basic Research Project [JCYJ20150529164918735, JCYJ20140417115840246, JCYJ20170412171359175, KQCX20140521161756227]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78059
Collection中国科学院金属研究所
Corresponding AuthorLv, W; Li, BH; Yang, QH (reprint author), Tsinghua Univ, Shenzhen Key Lab Graphene Based Mat & Engn, Lab Functionalized Carbon Mat, Grad Sch Shenzhen, Shenzhen 518055, Peoples R China.; Yang, QH (reprint author), Tsinghua Univ, TBSI, Shenzhen 518055, Peoples R China.; Yang, QH (reprint author), Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China.
Recommended Citation
GB/T 7714
Zhou, Tianhong,Lv, Wei,Li, Jia,et al. Twinborn TiO2-TiN heterostructures enabling smooth trapping-diffusion-conversion of polysulfides towards ultralong life lithium-sulfur batteries[J]. ENERGY & ENVIRONMENTAL SCIENCE,2017,10(7):1694-1703.
APA Zhou, Tianhong.,Lv, Wei.,Li, Jia.,Zhou, Guangmin.,Zhao, Yan.,...&Yang, QH .(2017).Twinborn TiO2-TiN heterostructures enabling smooth trapping-diffusion-conversion of polysulfides towards ultralong life lithium-sulfur batteries.ENERGY & ENVIRONMENTAL SCIENCE,10(7),1694-1703.
MLA Zhou, Tianhong,et al."Twinborn TiO2-TiN heterostructures enabling smooth trapping-diffusion-conversion of polysulfides towards ultralong life lithium-sulfur batteries".ENERGY & ENVIRONMENTAL SCIENCE 10.7(2017):1694-1703.
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