Integrated Impedance-NMR identification of electrolyte stability in Lithium-Air batteries

• Published in: Electrochimica acta Vol. 349; p. 136169
• Main Authors: Dornbusch, Donald A., Viggiano, Rocco P., Lvovich, Vadim F.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 20.07.2020; Elsevier BV
• Subjects: Battery cycles; Cathodes; Decomposition; Electrochemical impedance; Electrochemical impedance spectroscopy; Electrolytes; Equivalent circuits; Kinetics; Lithium; Lithium-oxygen battery; Metal air batteries; NMR; Nuclear magnetic resonance; Spectrum analysis; Lithium-oxygen battery; Nuclear magnetic resonance; Electrochemical impedance; Equivalent circuits
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2020.136169

The application of Electrochemical Impedance Spectroscopy (EIS) in conjunction with Nuclear Magnetic Resonance (NMR) is demonstrated as a powerful analytical combination for screening of electrolyte candidates for Lithium-Air (Li-Air) battery systems. Both analytical techniques are employed to examine electrochemical kinetics at the electrolyte-electrodes interfaces, decomposition of the electrolyte candidates, and Li-Air battery cycling performance. Correlations of the changes in the EIS spectra with variations in the electrolytes chemical condition and degree of degradation via NMR are presented, leading to a better understanding of the electrochemical kinetics at the air cathode, identification of design principles for stable electrolytes, and more accurate insights in their decomposition patterns. The approach is used to develop advanced battery components such as stable electrolytes and cathodes with well-structured architecture to provide substantially higher specific energy and longer battery cycle life.