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Estimating the thickness of diffusive solid electrolyte interface

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文摘 The solid electrolyte interface (SEI) is a hierarchical structure formed in the transition zone between the electrode and the electrolyte. The properties of lithium-ion (Li-ion) battery, such as cycle life, irreversible capacity loss, self-discharge rate, electrode corrosion and safety are usually ascribed to the quality of the SEI, which are highly dependent on the thickness. Thus, understanding the formation mechanism and the SEI thickness is of prime interest. First, we apply dimensional analysis to obtain an explicit relation between the thickness and the number density in this study. Then the SEI thickness in the initial charge-discharge cycle is analyzed and estimated for the first time using the Cahn-Hilliard phase-field model. In addition, the SEI thickness by molecular dynamics simulation validates the theoretical results. It has been shown that the established model and the simulation in this paper estimate the SEI thickness concisely within order-of-magnitude of nanometers. Our results may help in evaluating the performance of SEI and assist the future design of Li-ion battery.
来源 Science China. Physics , Mechanics & Astronomy,2017,60(6):064612-1-064612-8 【核心库】
DOI 10.1007/s11433-017-9031-2
关键词 lithium-ion battery ; solid electrolyte interface ; diffusion model ; thickness estimation
地址

Institute of Mechanics, Chinese Academy of Sciences, State Key Laboratory of Nonlinear Mechanics, Beijing, 100190

语种 英文
文献类型 研究性论文
ISSN 1674-7348
学科 物理学
基金 国家自然科学基金 ;  the Chinese Academy of Sciences (CAS) through CAS Interdisciplinary Innovation Team Project ;  the CAS Key Research Program of Frontier Sciences ;  the CAS Strategic Priority Research Program
文献收藏号 CSCD:6006720

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引证文献 4 篇

1 Xu Zhiping Micro- and nano-mechanics in China: A brief review of recent progress and perspectives Science China. Physics, Mechanics & Astronomy,2018,61(7):074601-1-074601-14
被引 17 次

2 Yang Jinhong Solute transport and interface evolution in dissolutive wetting Science China. Physics, Mechanics & Astronomy,2019,62(12):124611
被引 0 次

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