Ortiz Daniel, Steinmetz Vincent, Durand Delphine, Legand Solène, Dauvois Vincent, Maître Philippe, Le Caër Sophie
Institut Rayonnement Matière de Saclay, LIDyL et Service Interdisciplinaire sur les Systèmes Moléculaires et les Matériaux UMR 3299 CNRS/CEA SIS2M Laboratoire de Radiolyse, Bâtiment 546, F-91191 Gif-sur-Yvette, France.
Laboratoire de Chimie-Physique, UMR 8000 CNRS Université Paris Sud, Faculté des Sciences, Bâtiment 349, F-91405 Orsay, France.
Nat Commun. 2015 Apr 24;6:6950. doi: 10.1038/ncomms7950.
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.
碳酸二乙酯和碳酸二甲酯是锂离子电池中使用的环保型溶剂的典型例子。然而，它们的降解产物会影响电池性能及其安全性。因此，了解老化过程中涉及的反应机制至关重要。其中，氧化还原过程可能起着关键作用。在这里，我们表明辐射分解是产生电解质降解产物的理想工具。对辐照后检测到的主要气体（氢气、甲烷、乙烷、一氧化碳和二氧化碳）进行了识别和定量。此外，通过不同的质谱技术对液相中形成的化合物进行了表征。然后提出了反应机制。检测到的产物与锂基电池循环过程中的产物一致。这表明辐射分解是一种通用且非常有用的工具，有助于更好地理解锂离子电池中发生的现象。
