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Title: Ethylene Carbonate–Free Electrolytes for Stable, Safer High–Nickel Lithium–Ion Batteries

Journal Article · · Advanced Energy Materials

Ethylene carbonate (EC) is an important component in state-of-the-art electrolytes for lithium-ion batteries (LIBs). However, EC is highly susceptible to oxidation on the surface of high-nickel layered oxide cathodes, making it undesirable for next-generation high-energy-density LIBs. In this study, a simple, yet effective, EC-free electrolyte (20F1.5M-1TDI) is presented by adding 20 wt% fluoroethylene carbonate (FEC) and 1 wt% lithium 4,5-dicyano-2-(trifluoromethyl)imidazole (LiTDI) into 1.5 M LiPF6 in an ethyl methyl carbonate (EMC) electrolyte. The 20F1.5M-1TDI electrolyte is found to efficiently passivate the graphite anode and stabilize high-nickel cathodes by a synergistic decomposition of FEC and LiTDI. The LiNi0.9Mn0.05Al0.05O2 (NMA90)/graphite full cell with the 20F1.5M-1TDI electrolyte, therefore, exhibits an enhanced cycling stability and a suppressed voltage hysteresis growth compared to that with an EC-containing baseline electrolyte (1 M LiPF6 in EC:EMC, 3:7 in weight, with 2 wt% vinyl carbonate). Advanced analytical tools, such as time-of-flight secondary ion mass spectrometry and X-ray photoelectron spectroscopy, are employed to understand the underlying working mechanism of the EC-free electrolyte. Furthermore, the present study clearly showcases the great potential of EC-free electrolytes as a straightforward, practical approach for LIBs with high-nickel cathodes.

Research Organization:
Univ. of Texas at Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); Welch Foundation
Grant/Contract Number:
EE0008445; F-1254
OSTI ID:
1972446
Journal Information:
Advanced Energy Materials, Vol. 12, Issue 19; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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