Air-stable and freestanding lithium alloy/graphene foil as an alternative to lithium metal anodes

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	Air-stable and freestanding lithium alloy/graphene foil as an alternative to lithium metal anodes
	Zhao, Jie; Zhou, Guangmin; Yan, Kai; Xie, Jin; Li, Yuzhang; Liao, Lei; Jin, Yang; Liu, Kai; Hsu, Po-Chun; Wang, Jiangyan
刊名	NATURE PUBLISHING GROUP
	2017-10-01
卷号	12 期号:10 页码:993-999
ISSN号	1748-3387
英文摘要	Developing high-capacity anodes is a must to improve the energy density of lithium batteries for electric vehicle applications. Alloy anodes are one promising option, but without pre-stored lithium, the overall energy density is limited by the low-capacity lithium metal oxide cathodes. Recently, lithium metal has been revived as a high-capacity anode, but faces several challenges owing to its high reactivity and uncontrolled dendrite growth. Here, we show a series of Li-containing foils inheriting the desirable properties of alloy anodes and pure metal anodes. They consist of densely packed LixM (M= Si, Sn, or Al) nanoparticles encapsulated by large graphene sheets. With the protection of graphene sheets, the large and freestanding LixM/graphene foils are stable in different air conditions. With fully expanded LixSi confined in the highly conductive and chemically stable graphene matrix, this LixSi/graphene foil maintains a stable structure and cyclability in half cells (400 cycles with 98% capacity retention). This foil is also paired with high-capacity Li-free V2O5 and sulfur cathodes to achieve stable full-cell cycling.; Developing high-capacity anodes is a must to improve the energy density of lithium batteries for electric vehicle applications. Alloy anodes are one promising option, but without pre-stored lithium, the overall energy density is limited by the low-capacity lithium metal oxide cathodes. Recently, lithium metal has been revived as a high-capacity anode, but faces several challenges owing to its high reactivity and uncontrolled dendrite growth. Here, we show a series of Li-containing foils inheriting the desirable properties of alloy anodes and pure metal anodes. They consist of densely packed LixM (M= Si, Sn, or Al) nanoparticles encapsulated by large graphene sheets. With the protection of graphene sheets, the large and freestanding LixM/graphene foils are stable in different air conditions. With fully expanded LixSi confined in the highly conductive and chemically stable graphene matrix, this LixSi/graphene foil maintains a stable structure and cyclability in half cells (400 cycles with 98% capacity retention). This foil is also paired with high-capacity Li-free V2O5 and sulfur cathodes to achieve stable full-cell cycling.
学科主题	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
语种	英语
资助机构	Office of Vehicle Technologies, Battery Materials Research Program of the US Department of Energy; National Science Foundation Graduate Fellowship Program
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79072]
专题	金属研究所_中国科学院金属研究所
通讯作者	Cui, Y (reprint author), Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA.; Cui, Y (reprint author), SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.
推荐引用方式 GB/T 7714	Zhao, Jie,Zhou, Guangmin,Yan, Kai,et al. Air-stable and freestanding lithium alloy/graphene foil as an alternative to lithium metal anodes[J]. NATURE PUBLISHING GROUP,2017,12(10):993-999.
APA	Zhao, Jie.,Zhou, Guangmin.,Yan, Kai.,Xie, Jin.,Li, Yuzhang.,...&Cui, Y .(2017).Air-stable and freestanding lithium alloy/graphene foil as an alternative to lithium metal anodes.NATURE PUBLISHING GROUP,12(10),993-999.
MLA	Zhao, Jie,et al."Air-stable and freestanding lithium alloy/graphene foil as an alternative to lithium metal anodes".NATURE PUBLISHING GROUP 12.10(2017):993-999.