Twinborn TiO2-TiN heterostructures enabling smooth trapping-diffusion-conversion of polysulfides towards ultralong life lithium-sulfur batteries

IMR OpenIR

	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
发表期刊	ENERGY & ENVIRONMENTAL SCIENCE
ISSN	1754-5692
卷号	10 期号:7 页码:1694-1703
摘要	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.; 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.
部门归属	[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
学科领域	Chemistry, Multidisciplinary ; Energy & Fuels ; Engineering, Chemical ; Environmental Sciences
资助者	National 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]
收录类别	SCI
语种	英语
WOS记录号	WOS:000405279900017
引用统计	被引频次：946[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/78059
专题	中国科学院金属研究所
通讯作者	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.
推荐引用方式 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.