Fluoro-Ether as a Bifunctional Interphase Electrolyte Additive with Graphite/LiNi0.5Co 0.2Mn0.3O2 Full Cell

Fluoro-Ether as a Bifunctional Interphase Electrolyte Additive with Graphite/LiNi0.5Co 0.2Mn0.3O2 Full Cell

TitleFluoro-Ether as a Bifunctional Interphase Electrolyte Additive with Graphite/LiNi0.5Co 0.2Mn0.3O2 Full Cell
Publication TypeJournal Article
Year of Publication2019
AuthorsShuai Heng, Yan Wang, Qunting Qu, Ruitian Guo, Xiaojian Shan, Vincent S Battaglia, Gao Liu, Honghe Zheng
JournalACS Applied Energy Materials
Volume2
Issue9
Pagination6404 - 6416
Date Published08/2019
ISSN2574-0962
Abstract

In this paper, 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) is adopted as a bifunctional electrolyte additive, which is identified to effectively stabilize the surface for both graphite anode and LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode within the graphite/NCM523 full cell. The overall electrochemical performances of the full cell are significantly enhanced with 3 wt % TTE additive in a conventional organic electrolyte. A combination of studies of scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectroscopy show that a uniform, compact, and stable solid electrolyte interphase (SEI) with improved mechanics on the graphite anode and an effective cathode electrolyte interphase (CEI) on the NCM523 cathode is developed. The electron-withdrawing C–F group contributes to the stable and compact surface film, which explains the electrochemical enhancement of the NCM523/graphite full cell.

DOI10.1021/acsaem.9b00972
Short TitleACS Appl. Energy Mater.
Refereed DesignationRefereed