Oxidative decomposition mechanisms of lithium carbonate on carbon substrates in lithium battery chemistries

Registration ID: IJNRD_183918

Published ID: IJNRD2210182

: http://doi.one/10.1729/Journal.32144

Dr. Sudhir Kumar Mishra

Overpotential, Gas chromatography, Singlet oxygen, DMS, 13C-substrate, Superoxide, Electrooxidative process, Elecrolyte degradation.

Lithium carbonate plays a critical role in both lithium-carbon dioxide and lithium-air batteries as the main discharge product and a product of side reactions, respectively. Understanding the decomposition of lithium carbonate during electrochemical oxidation (during battery charging) is key for improving both chemistries, but the decomposition mechanisms and the role of the carbon substrate remain under debate. Here, we use an in-situ differential electrochemical mass spectrometry-gas chromatography coupling system to quantify the gas evolution during the electrochemical oxidation of lithium carbonate on carbon substrates. Our results show that lithium carbonate decomposes to carbon dioxide and singlet oxygen mainly via an electrochemical process instead of via a chemical process in an electrolyte of lithium bis(trifluoromethanesulfonyl)imide in tetraglyme. Singlet oxygen attacks the carbon substrate and electrolyte to form both carbon dioxide and carbon monoxide—approximately 20% of the net gas evolved originates from these side reactions. Additionally, we show that cobalt(II,III) oxide, a typical oxygen evolution catalyst, stabilizes the precursor of singlet oxygen, thus inhibiting the formation of singlet oxygen and consequent side reactions.

Published Paper   E-Certificate

Dr. Sudhir Kumar Mishra (October-2022). Oxidative decomposition mechanisms of lithium carbonate on carbon substrates in lithium battery chemistries. INTERNATIONAL JOURNAL OF NOVEL RESEARCH AND DEVELOPMENT, 7(10), 437-461. http://doi.one/10.1729/Journal.32144

Volume 7 Issue 10, October-2022

Pages : 437-461

Paper Reg. ID: IJNRD_183918

Published Paper Id: IJNRD2210182

Downloads: 000122256

Research Area: Engineering

Author Type: Foreign Author

Country: -, -, -

Published Paper PDF: https://ijnrd.org/papers/IJNRD2210182.pdf

Published Paper URL: https://ijnrd.org/viewpaperforall?paper=IJNRD2210182

Crossref DOI: http://doi.one/10.1729/Journal.32144

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