In-situ EC-AFM and ex-situ XPS characterization to investigate the mechanism of SEI formation in highly concentrated aqueous electrolyte for Li-ion batteries

doi:10.1016/j.apsusc.2019.145059

CORC > 宁波材料技术与工程研究所 > 中国科学院宁波材料技术与工程研究所 > 2020专题

	In-situ EC-AFM and ex-situ XPS characterization to investigate the mechanism of SEI formation in highly concentrated aqueous electrolyte for Li-ion batteries
	Zhang, Haitao; Wang, Deyu; Shen, Cai
刊名	APPLIED SURFACE SCIENCE
	2020
卷号	507
关键词	ELECTROCHEMICAL-BEHAVIOR HIGH-ENERGY CARBONATE WATER GRAPHITE OPERANDO PROGRESS INSIGHT
DOI	10.1016/j.apsusc.2019.145059
英文摘要	The structure and chemical composition of solid electrolyte interphase (SEI) play a critical role in the performance of Li-ion batteries. However, the complexity of SEI layer and lack of relevant and efficient characterization techniques limit understanding of SEI formation mechanism and associated properties. Moreover, compared with organic electrolyte-based SEI, few studies have focused on aqueous electrolyte-based solid-electrolyte interphase (A-SEI). Herein, we present in-situ AFM images to demonstrate the morphological evolution of SEI in the presence of 21M lithium bis(trifluoromethane sulfonyl) imide (LiTFSI) aqueous electrolyte. Moreover, a combination of electrochemical-controlled atomic force microscopy (EC-AFM) and ex-situ X-ray photoelectron spectroscopy (XPS) is utilized to unveil the mechanism of SEI formation and identify its components. The results reveal that A-SEI layer is unevenly distributed and the inner and outer layers are mainly composed of Li2CO3 and LiF, respectively. The Young's modulus of 4-6 nm thick SEI layer is found to be 30 +/- 10 GPa. The current study provides novel insights into the formation of A-SEI by using in-situ AFM and provides a baseline for the future development of aqueous electrolytes for Li-ion batteries.
学科主题	Chemistry ; Materials Science ; Physics
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/19849]
专题	2020专题
作者单位	Shen, C (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, 1219 Zhongguan Rd, Ningbo 315201, Peoples R China.
推荐引用方式 GB/T 7714	Zhang, Haitao,Wang, Deyu,Shen, Cai. In-situ EC-AFM and ex-situ XPS characterization to investigate the mechanism of SEI formation in highly concentrated aqueous electrolyte for Li-ion batteries[J]. APPLIED SURFACE SCIENCE,2020,507.
APA	Zhang, Haitao,Wang, Deyu,&Shen, Cai.(2020).In-situ EC-AFM and ex-situ XPS characterization to investigate the mechanism of SEI formation in highly concentrated aqueous electrolyte for Li-ion batteries.APPLIED SURFACE SCIENCE,507.
MLA	Zhang, Haitao,et al."In-situ EC-AFM and ex-situ XPS characterization to investigate the mechanism of SEI formation in highly concentrated aqueous electrolyte for Li-ion batteries".APPLIED SURFACE SCIENCE 507(2020).