globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1911017116
论文题名:
The intrinsic behavior of lithium fluoride in solid electrolyte interphases on lithium
作者: He M.; Guo R.; Hobold G.M.; Gao H.; Gallant B.M.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:1
起始页码: 73
结束页码: 79
语种: 英语
英文关键词: Li battery ; Li metal anode ; Solid electrolyte interface
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163504
Appears in Collections:气候变化与战略

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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

Recommended Citation:
He M.,Guo R.,Hobold G.M.,et al. The intrinsic behavior of lithium fluoride in solid electrolyte interphases on lithium[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(1)
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