Stabilization of Li Metal Anode in DMSO-Based Electrolytes via Optimization of Salt-Solvent Coordination for Li-O 2 Batteries

Liu, Bin; Xu, Wu; Yan, Pengfei; Kim, Sun Tai; Engelhard, Mark H.; Sun, Xiuliang; Mei, Donghai; Cho, Jaephil; Wang, Chong-Min; Zhang, Ji-Guang

doi:10.1002/aenm.201602605

Stabilization of Li Metal Anode in DMSO-Based Electrolytes via Optimization of Salt-Solvent Coordination for Li-O ₂ Batteries

Journal Article · Wed Mar 08 04:00:00 EST 2017 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201602605· OSTI ID:1372980

Liu, Bin ^[1]; Xu, Wu ^[1]; Yan, Pengfei ^[2]; Kim, Sun Tai ^[3]; Engelhard, Mark H. ^[2]; Sun, Xiuliang ^[4]; Mei, Donghai ^[4]; Cho, Jaephil ^[5]; Wang, Chong-Min ^[2]; Zhang, Ji-Guang ^[1]

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

The conventional DMSO-based electrolyte (1 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in DMSO) is unstable against the Li metal anode and therefore cannot be used directly in practical Li-O2 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-O2 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 cyclic stability of Li-O2 batteries. The fundamental stability of the electrolyte with free-solvent against the chemical and electrochemical reactions can also be used to enhance the stability of other electrochemical systems.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1372980

Report Number(s):: PNNL-SA-121082; 48379; VT1201000

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 14 Vol. 7; ISSN 1614-6832

Publisher:: Wiley

Country of Publication:: United States

Language:: English

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