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A salt-derived solid electrolyte interphase by electroreduction of water-in-salt electrolyte for uniform lithium deposition
Wang, Zhenxing; Sun, Chengguo; Shi, Ying; Qi, Fulai; Wei, Qinwei; Li, Xin; Sun, Zhenhua; An, Baigang; Li, Feng
2019-11-01
Source PublicationJOURNAL OF POWER SOURCES
ISSN0378-7753
Volume439
AbstractNotorious growth of dendritic lithium with low Coulombic efficiency causes safety and stability issues, which hinder practical applications. To control the lithium deposition so that one has a dendrite-free lithium metal anode with high Coulombic efficiency is highly desirable but challenging. Here, this work reports a copper substrate covered by a salt-derived solid electrolyte interphase that produced by electroreduction of a highly concentrated water-in-salt electrolyte to realize stable lithium deposition. Quite distinct from the resistive layer comprised principally of solvent-derived organic species (such as lithium alkyl carbonates) that produced in conventional dilute electrolyte, this salt-derived solid electrolyte interphase is rich in inorganic components (mainly Li2SxOy and LiF), which effectively reduce the overpotential and facilitate fast Li+ transport. In addition, a small number of reduced fluorine organic anions -CFx stabilize the space charge to give a uniform distribution of Li+. Such a solid electrolyte interphase on the copper substrate is able to modulate the lithium plating/stripping to produce uniform spherical lithium deposition with no dendrites, and a high Coulombic efficiency (approximate to 98.2%) is achieved. This work provides a unique strategy to enlarge the functions of the lithium salt decompositions on the protection of lithium metal anodes.
KeywordWater-in-salt Solid electrolyte interphase Dendrite-free Li anode Electroreduction Space charge
Indexed BySCI
Language英语
WOS IDWOS:000494891700006
PublisherELSEVIER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80666
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Wang, Zhenxing,Sun, Chengguo,Shi, Ying,et al. A salt-derived solid electrolyte interphase by electroreduction of water-in-salt electrolyte for uniform lithium deposition[J]. JOURNAL OF POWER SOURCES,2019,439.
APA Wang, Zhenxing.,Sun, Chengguo.,Shi, Ying.,Qi, Fulai.,Wei, Qinwei.,...&Li, Feng.(2019).A salt-derived solid electrolyte interphase by electroreduction of water-in-salt electrolyte for uniform lithium deposition.JOURNAL OF POWER SOURCES,439.
MLA Wang, Zhenxing,et al."A salt-derived solid electrolyte interphase by electroreduction of water-in-salt electrolyte for uniform lithium deposition".JOURNAL OF POWER SOURCES 439(2019).
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