globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2020.05.018
论文题名:
A thick yet dense silicon anode with enhanced interface stability in lithium storage evidenced by in situ TEM observations
作者: Han J.; Tang D.-M.; Kong D.; Chen F.; Xiao J.; Zhao Z.; Pan S.; Wu S.; Yang Q.-H.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期:18
起始页码: 1563
结束页码: 1569
语种: 英语
中文关键词: 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
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
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169907
Appears in Collections:气候变化与战略

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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

Recommended Citation:
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]. Science Bulletin,2020-01-01,65(18)
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