中文版 | English
Title

Deciphering the mechanism of concentrated electrolyte for lithium metal anode via cryogenic electron microscopy

Author
Corresponding AuthorGu,Meng
Publication Years
2023-02-15
DOI
Source Title
ISSN
0378-7753
EISSN
1873-2755
Volume557
Abstract
Increasing electrolyte concentration is a typical strategy to boost the stability of lithium (Li) metal anode, yet the fundamental mechanism remains a mystery. By virtue of comprehensive characterization of solid electrolyte interphase (SEI) via cryogenic electron microscopy (Cryo-EM), we revealed the effects of solvation structure in ether-based electrolytes on SEI formation as well as electrochemical performance. The SEI formed in the low-concentration electrolyte (LCE) adopts a Mosaic-type structure with randomly distributed LiCO, which leads to uneven Li deposition and poor cycle stability. The high-concentration electrolyte (HCE) with few free solvent molecules generates an amorphous monolayer SEI, contributing to significantly improved Coulombic efficiency and cycle stability. The addition of non-solvating diluent enables uniform Li deposition on Cu foils in the prepared local high-concentration electrolyte (LHCE), and brings about further enhancement in reversibility and stability. It is correlated with the dual-layer but thinner SEI consisting of an inner amorphous layer and an outer layer made up of mainly crystalline LiSO with high Li conductivity. This work points out the necessity to optimize the SEI structure as well as the solvation structure by altering the salt-to-solvent ratio or adding diluent to modify the viscosity and conductivity of electrolyte system.
Keywords
URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
Corresponding
Funding Project
National Natural Science Foundation of China[52273225] ; Shenzhen fundamental research funding["JCYJ20210324115809026","20200925154115001"] ; Shenzhen Science and Technology Program[2019ZT08C044] ; Guangdong Innovative and Entrepreneurial Research Team Program[2022M711467] ; China Postdoctoral Science Foundation[JCYJ20200109141216566] ; null[KQTD20190929173815000]
WOS Research Area
Chemistry ; Electrochemistry ; Energy & Fuels ; Materials Science
WOS Subject
Chemistry, Physical ; Electrochemistry ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS Accession No
WOS:000921192700001
Publisher
ESI Research Field
MATERIALS SCIENCE
Scopus EID
2-s2.0-85147022413
Data Source
Scopus
Citation statistics
Cited Times [WOS]:0
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/442667
DepartmentDepartment of Materials Science and Engineering
Affiliation
1.School of Materials Science and Engineering,Harbin Institute of Technology,Harbin,150001,China
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.Graphene Composite Research Center,College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen,518060,China
4.School of Materials Science and Engineering,Dongguan University of Technology,Dongguan,523808,China
5.Department of Materials Science and Nano Engineering,Rice University,Houston,6100 Main Street,77005,United States
First Author AffilicationDepartment of Materials Science and Engineering
Corresponding Author AffilicationDepartment of Materials Science and Engineering
Recommended Citation
GB/T 7714
Li,Menghao,Zhang,Qing,Yang,Xuming,et al. Deciphering the mechanism of concentrated electrolyte for lithium metal anode via cryogenic electron microscopy[J]. JOURNAL OF POWER SOURCES,2023,557.
APA
Li,Menghao.,Zhang,Qing.,Yang,Xuming.,Zhu,Yuanmin.,Cheng,Yifeng.,...&Gu,Meng.(2023).Deciphering the mechanism of concentrated electrolyte for lithium metal anode via cryogenic electron microscopy.JOURNAL OF POWER SOURCES,557.
MLA
Li,Menghao,et al."Deciphering the mechanism of concentrated electrolyte for lithium metal anode via cryogenic electron microscopy".JOURNAL OF POWER SOURCES 557(2023).
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