Radiolysis as a solution for accelerated ageing studies of electrolytes in Lithium-ion batteries

Daniel Ortiz, Vincent Steinmetz, Delphine Durand, Solène Legand, Vincent Dauvois, Philippe Maître and Sophie Le Caër ()
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Daniel Ortiz: Institut Rayonnement Matière de Saclay, LIDyL et Service Interdisciplinaire sur les Systèmes Moléculaires et les Matériaux UMR 3299 CNRS/CEA SIS2M Laboratoire de Radiolyse
Vincent Steinmetz: Laboratoire de Chimie-Physique, UMR 8000 CNRS Université Paris Sud, Faculté des Sciences
Delphine Durand: CEA/Saclay, DEN/DANS/DPC/SECR/LRMO
Solène Legand: CEA/Saclay, DEN/DANS/DPC/SECR/LRMO
Vincent Dauvois: CEA/Saclay, DEN/DANS/DPC/SECR/LRMO
Philippe Maître: Laboratoire de Chimie-Physique, UMR 8000 CNRS Université Paris Sud, Faculté des Sciences
Sophie Le Caër: Institut Rayonnement Matière de Saclay, LIDyL et Service Interdisciplinaire sur les Systèmes Moléculaires et les Matériaux UMR 3299 CNRS/CEA SIS2M Laboratoire de Radiolyse

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Diethyl carbonate and dimethyl carbonate are prototype examples of eco-friendly solvents used in lithium-ion batteries. Nevertheless, their degradation products affect both the battery performance and its safety. Therefore, it is of paramount importance to understand the reaction mechanisms involved in the ageing processes. Among those, redox processes are likely to play a critical role. Here we show that radiolysis is an ideal tool to generate the electrolytes degradation products. The major gases detected after irradiation (H2, CH4, C2H6, CO and CO2) are identified and quantified. Moreover, the chemical compounds formed in the liquid phase are characterized by different mass spectrometry techniques. Reaction mechanisms are then proposed. The detected products are consistent with those of the cycling of Li-based cells. This demonstrates that radiolysis is a versatile and very helpful tool to better understand the phenomena occurring in lithium-ion batteries.

Date: 2015
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DOI: 10.1038/ncomms7950

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