气候变化领域集成服务门户(CCPortal): A thick yet dense silicon anode with enhanced interface stability in lithium storage evidenced by in situ TEM observations

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DOI	10.1016/j.scib.2020.05.018
	A thick yet dense silicon anode with enhanced interface stability in lithium storage evidenced by in situ TEM observations
	Han J.; Tang D.-M.; Kong D.; Chen F.; Xiao J.; Zhao Z.; Pan S.; Wu S.; Yang Q.-H.
发表日期	2020
ISSN	20959273
起始页码	1563
结束页码	1569
卷号	65 期号:18
英文摘要	Increasing the density and thickness of electrodes is required to maximize the volumetric energy density of lithium-ion batteries for practical applications. However, dense and thick electrodes, especially high-mass-content (>50 wt%) silicon anodes, have poor mechanical stability due to the presence of a large number of unstable interfaces between the silicon and conducting components during cycling. Here we report a network of mechanically robust carbon cages produced by the capillary shrinkage of graphene hydrogels that can contain the silicon nanoparticles in the cages and stabilize the silicon/carbon interfaces. In situ transmission electron microscope characterizations including compression and tearing of the structure and lithiation-induced silicon expansion experiments, have provided insight into the excellent confinement and buffering ability of this interface-strengthened graphene-caged silicon nanoparticle anode material. Consequently, a dense and thick silicon anode with reduced thickness fluctuations has been shown to deliver both high volumetric (>1000 mAh cm−3) and areal (>6 mAh cm−2) capacities together with excellent cycling capability. © 2020 Science China Press
关键词	Dense and thick electrodes In situ TEM Interface stability Lithium-ion battery Silicon anode
英文关键词	Graphene; In situ processing; Lithium-ion batteries; Mechanical stability; Nanoparticles; Silicon; Transmission electron microscopy; Graphene hydrogels; Interface stabilities; Lithium storages; Mechanically robust; Silicon nanoparticles; Thickness fluctuations; Unstable interfaces; Volumetric energy densities; Anodes
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207051
作者单位	Nanoyang Group, State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300350, China; International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan; CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China; Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou, 350207, China
推荐引用方式 GB/T 7714	Han J.,Tang D.-M.,Kong D.,et al. A thick yet dense silicon anode with enhanced interface stability in lithium storage evidenced by in situ TEM observations[J],2020,65(18).
APA	Han J..,Tang D.-M..,Kong D..,Chen F..,Xiao J..,...&Yang Q.-H..(2020).A thick yet dense silicon anode with enhanced interface stability in lithium storage evidenced by in situ TEM observations.Science Bulletin,65(18).
MLA	Han J.,et al."A thick yet dense silicon anode with enhanced interface stability in lithium storage evidenced by in situ TEM observations".Science Bulletin 65.18(2020).