Research progress of lithium ion battery solid-electrolyte interface(SEI)

doi:10.12028/j.issn.2095-4239.2018.0059

Abstract

Abstract: The lithium ion battery solid-electrolyte interface (SEI) is a thin-layer film formed on the surface of electrodes due to redox decomposition of electrolyte in the initial charging process. SEI film with high ionic conduction and electrical resistance is quite necessary for the long-term usage of lithium ion batteries and has a crucial impact on their capacity, rate, cycling and safety performances. However, because of its complex formation processes and great difficulties in making accurate characterization, only a superficial knowledge of SEI derive from some experimental observation or model hypothesis, thus quantitative analysis and controllable structural optimization are still needed to be further investigated. This paper reviews the formation process, the influence factors,some research ideas and current research status of SEI film. In addition, some potential research directions of SEI have been presented, including investigating the formation mechanism and role of SEI on the surface of cathode materials, optimizing the electrolyte formulas through solvents, lithium salts and additives to facilitate the formation of more stable SEI films, adopting advanced in-situ analysis methods and theoretical calculation methods to analyze chemical composition, morphology and microstructure of SEI, exploring effective ways to construct artificial SEI film and realize controllable structural modification.

Key words: lithium ion battery, solid-electrolyte interface, formation mechanism, electrolyte

CLC Number:

TM911

LIANG Dayu, BAO Tingting, GAO Tianhui, ZHANG Jian. Research progress of lithium ion battery solid-electrolyte interface(SEI)[J]. Energy Storage Science and Technology, 2018, 7(3): 418-423.

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