Stabilization of Li Metal Anode in DMSO‐Based Electrolytes via Optimization of Salt–Solvent Coordination for Li–O 2 Batteries
Abstract
The conventional electrolyte of 1 m lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in dimethyl sulfoxide (DMSO) is unstable against the Li metal anode and therefore cannot be used directly in practical Li–O 2 batteries. Here, we demonstrate that a highly concentrated electrolyte based on LiTFSI in DMSO (with a molar ratio of 1:3) can greatly improve the stability of the Li metal anode against DMSO and significantly improve the cycling stability of Li–O 2 batteries. This highly concentrated electrolyte contains no free DMSO solvent molecules, but only complexes of (TFSI − ) a Li + (DMSO) b (where a + b = 4), and thus enhances their stability with Li metal anodes. In addition, such salt–solvent complexes have higher Gibbs activation energy barriers than the free DMSO solvent molecules, indicating improved stability of the electrolyte against the attack of superoxide radical anions. Therefore, the stability of this highly concentrated electrolyte at both Li metal anodes and carbon‐based air electrodes has been greatly enhanced, resulting in improved cycling performance of Li–O 2 batteries. The fundamental stability of the electrolyte in the absence of free‐solvent against the chemical and electrochemical reactions can also be used to enhance the stability of other electrochemical systems.
- Authors:
-
- Energy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
- Environmental and Molecular Sciences Laboratory Pacific Northwest National Laboratory Richland WA 99354 USA
- Energy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99354 USA, Department of Energy Engineering School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology Ulsan 689‐798 South Korea
- Physical and Computational Sciences Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
- Department of Energy Engineering School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology Ulsan 689‐798 South Korea
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1400619
- Grant/Contract Number:
- DEAC02‐05CH11231; DEAC02‐98CH10886; DE‐AC05‐76RLO1830
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Advanced Energy Materials
- Additional Journal Information:
- Journal Name: Advanced Energy Materials Journal Volume: 7 Journal Issue: 14; Journal ID: ISSN 1614-6832
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- Germany
- Language:
- English
Citation Formats
Liu, Bin, Xu, Wu, Yan, Pengfei, Kim, Sun Tai, Engelhard, Mark H., Sun, Xiuliang, Mei, Donghai, Cho, Jaephil, Wang, Chong‐Min, and Zhang, Ji‐Guang. Stabilization of Li Metal Anode in DMSO‐Based Electrolytes via Optimization of Salt–Solvent Coordination for Li–O 2 Batteries. Germany: N. p., 2017.
Web. doi:10.1002/aenm.201602605.
Liu, Bin, Xu, Wu, Yan, Pengfei, Kim, Sun Tai, Engelhard, Mark H., Sun, Xiuliang, Mei, Donghai, Cho, Jaephil, Wang, Chong‐Min, & Zhang, Ji‐Guang. Stabilization of Li Metal Anode in DMSO‐Based Electrolytes via Optimization of Salt–Solvent Coordination for Li–O 2 Batteries. Germany. https://doi.org/10.1002/aenm.201602605
Liu, Bin, Xu, Wu, Yan, Pengfei, Kim, Sun Tai, Engelhard, Mark H., Sun, Xiuliang, Mei, Donghai, Cho, Jaephil, Wang, Chong‐Min, and Zhang, Ji‐Guang. Wed .
"Stabilization of Li Metal Anode in DMSO‐Based Electrolytes via Optimization of Salt–Solvent Coordination for Li–O 2 Batteries". Germany. https://doi.org/10.1002/aenm.201602605.
@article{osti_1400619,
title = {Stabilization of Li Metal Anode in DMSO‐Based Electrolytes via Optimization of Salt–Solvent Coordination for Li–O 2 Batteries},
author = {Liu, Bin and Xu, Wu and Yan, Pengfei and Kim, Sun Tai and Engelhard, Mark H. and Sun, Xiuliang and Mei, Donghai and Cho, Jaephil and Wang, Chong‐Min and Zhang, Ji‐Guang},
abstractNote = {The conventional electrolyte of 1 m lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in dimethyl sulfoxide (DMSO) is unstable against the Li metal anode and therefore cannot be used directly in practical Li–O 2 batteries. Here, we demonstrate that a highly concentrated electrolyte based on LiTFSI in DMSO (with a molar ratio of 1:3) can greatly improve the stability of the Li metal anode against DMSO and significantly improve the cycling stability of Li–O 2 batteries. This highly concentrated electrolyte contains no free DMSO solvent molecules, but only complexes of (TFSI − ) a Li + (DMSO) b (where a + b = 4), and thus enhances their stability with Li metal anodes. In addition, such salt–solvent complexes have higher Gibbs activation energy barriers than the free DMSO solvent molecules, indicating improved stability of the electrolyte against the attack of superoxide radical anions. Therefore, the stability of this highly concentrated electrolyte at both Li metal anodes and carbon‐based air electrodes has been greatly enhanced, resulting in improved cycling performance of Li–O 2 batteries. The fundamental stability of the electrolyte in the absence of free‐solvent against the chemical and electrochemical reactions can also be used to enhance the stability of other electrochemical systems.},
doi = {10.1002/aenm.201602605},
journal = {Advanced Energy Materials},
number = 14,
volume = 7,
place = {Germany},
year = {Wed Mar 08 00:00:00 EST 2017},
month = {Wed Mar 08 00:00:00 EST 2017}
}
https://doi.org/10.1002/aenm.201602605
Web of Science
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