Ethylene Carbonate–Free Electrolytes for Stable, Safer High–Nickel Lithium–Ion Batteries
Abstract
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.
- Publication Date:
- Research Org.:
- Univ. of Texas at Austin, TX (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); Welch Foundation
- OSTI Identifier:
- 1972446
- Grant/Contract Number:
- EE0008445; F-1254
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Energy Materials
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 19; Journal ID: ISSN 1614-6832
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; lithium-ion batteries; ethylene carbonate-free electrolyte; high-nickel oxide cathodes; electrode/electrolyte interface; safety
Citation Formats
Pan, Ruijun, Cui, Zehao, Yi, Michael, Xie, Qiang, and Manthiram, Arumugam. Ethylene Carbonate–Free Electrolytes for Stable, Safer High–Nickel Lithium–Ion Batteries. United States: N. p., 2022.
Web. doi:10.1002/aenm.202103806.
Pan, Ruijun, Cui, Zehao, Yi, Michael, Xie, Qiang, & Manthiram, Arumugam. Ethylene Carbonate–Free Electrolytes for Stable, Safer High–Nickel Lithium–Ion Batteries. United States. https://doi.org/10.1002/aenm.202103806
Pan, Ruijun, Cui, Zehao, Yi, Michael, Xie, Qiang, and Manthiram, Arumugam. Thu .
"Ethylene Carbonate–Free Electrolytes for Stable, Safer High–Nickel Lithium–Ion Batteries". United States. https://doi.org/10.1002/aenm.202103806. https://www.osti.gov/servlets/purl/1972446.
@article{osti_1972446,
title = {Ethylene Carbonate–Free Electrolytes for Stable, Safer High–Nickel Lithium–Ion Batteries},
author = {Pan, Ruijun and Cui, Zehao and Yi, Michael and Xie, Qiang and Manthiram, Arumugam},
abstractNote = {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.},
doi = {10.1002/aenm.202103806},
journal = {Advanced Energy Materials},
number = 19,
volume = 12,
place = {United States},
year = {Thu Mar 24 00:00:00 EDT 2022},
month = {Thu Mar 24 00:00:00 EDT 2022}
}
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