A New Anion Receptor for Improving the Interface between Lithium- and Manganese-Rich Layered Oxide Cathode and the Electrolyte

A New Anion Receptor for Improving the Interface between Lithium- and Manganese-Rich Layered Oxide Cathode and the Electrolyte

TitleA New Anion Receptor for Improving the Interface between Lithium- and Manganese-Rich Layered Oxide Cathode and the Electrolyte
Publication TypeJournal Article
Year of Publication2017
AuthorsYulin Ma, Yan Zhou, Chunyu Du, Pengjian Zuo, Xinqun Cheng, Lili Han, Dennis Nordlund, Yunzhi Gao, Geping Yin, Huolin L Xin, Marca M Doeff, Feng Lin, Guoying Chen
JournalChemistry of Materials
Volume29
Issue5
Pagination2141 - 2149
Date Published02/2017
ISSN0897-4756
Abstract

Surface degradation on cycled lithium-ion battery cathode particles is governed not only by intrinsic thermodynamic properties of the material but also, oftentimes more predominantly, by the side reactions with the electrolytic solution. A superior electrolyte inhibits these undesired side reactions on the cathode and at the electrolyte interface, which consequently minimizes the deterioration of the cathode surface. The present study investigates a new boron-based anion receptor, tris(2,2,2-trifluoroethyl)borate (TTFEB), as an electrolyte additive in cells containing a lithium- and manganese-rich layered oxide cathode, Li1.16Ni0.2Co0.1Mn0.54O2. Our electrochemical studies demonstrate that the cycling performance and Coulombic efficiency are significantly improved because of the additive, in particular, under elevated temperature conditions. Spectroscopic analyses revealed that the addition of 0.5 wt % TTFEB is capable of reducing the content of lithium-containing inorganic species within the cathode-electrolyte interphase layer and minimizing the reduction of tetravalent Mn4+ at the cathode surface. Our work introduces a novel additive highly effective in improving lithium-ion battery performance, highlights the importance in preserving the surface properties of cathode materials, and provides new insights on the working mechanism of electrolyte additives.

DOI10.1021/acs.chemmater.6b04784
Short TitleChem. Mater.
Refereed DesignationRefereed