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DOI	10.1073/pnas.1911017116
	The intrinsic behavior of lithium fluoride in solid electrolyte interphases on lithium
	He M.; Guo R.; Hobold G.M.; Gao H.; Gallant B.M.
发表日期	2020
ISSN	0027-8424
起始页码	73
结束页码	79
卷号	117 期号:1
英文摘要	Lithium is the most attractive anode material for high-energy density rechargeable batteries, but its cycling is plagued by morphological irreversibility and dendrite growth that arise in part from its heterogeneous “native” solid electrolyte interphase (SEI). Enriching the SEI with lithium fluoride (LiF) has recently gained popularity to improve Li cyclability. However, the intrinsic function of LiF—whether chemical, mechanical, or kinetic in nature—remains unknown. Herein, we investigated the stability of LiF in model LiF-enriched SEIs that are either artificially preformed or derived from fluorinated electrolytes, and thus, the effect of the LiF source on Li electrode behavior. We discovered that the mechanical integrity of LiF is easily compromised during plating, making it intrinsically unable to protect Li. The ensuing in situ repair of the interface by electrolyte, either regenerating LiF or forming an extra elastomeric “outer layer,” is identified as the more critical determinant of Li electrode performance. Our findings present an updated and dynamic picture of the LiF-enriched SEI and demonstrate the need to carefully consider the combined role of ionic and electrolyte-derived layers in future design strategies. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Li battery; Li metal anode; Solid electrolyte interface
语种	英语
scopus关键词	elastomer; lithium; lithium fluoride; amperometry; Article; chemical analysis; chemical binding; chronoamperometry; electrochemistry; fluorination; methodology; morphology; phenomenology; physical chemistry; priority journal; reaction time; regeneration; scanning electron microscopy; synthesis; X ray diffraction; X ray photoemission spectroscopy
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160324
作者单位	He, M., Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Guo, R., Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Hobold, G.M., Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Gao, H., Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Gallant, B.M., Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States
推荐引用方式 GB/T 7714	He M.,Guo R.,Hobold G.M.,et al. The intrinsic behavior of lithium fluoride in solid electrolyte interphases on lithium[J],2020,117(1).
APA	He M.,Guo R.,Hobold G.M.,Gao H.,&Gallant B.M..(2020).The intrinsic behavior of lithium fluoride in solid electrolyte interphases on lithium.Proceedings of the National Academy of Sciences of the United States of America,117(1).
MLA	He M.,et al."The intrinsic behavior of lithium fluoride in solid electrolyte interphases on lithium".Proceedings of the National Academy of Sciences of the United States of America 117.1(2020).