Development of a new Electrochemical Impedance Spectroscopy Approach for Monitoring the Solid Electrolyte Interphase Formation

作者：Heins Tom P^*; Harms Nina; Schramm Linda Susann; Schroeder Uwe

来源：Energy Technology, 2016, 4(12): 1509-1513.

DOI：10.1002/ente.201600132

• activation energy
• batteries
• electrochemical impedance spectroscopy
• lithium
• solid electrolyte interphase

The formation of surface films on lithium ion electrodes is a crucial factor for the performance and durability of the respective battery. Especially the formation of the solid electrolyte interphase (SEI) on the anodes of these cells widely determines the stability and functionality of the electrode. Therefore, a precise insight into the formation process of this layer is required. Based on temperature-dependent electrochemical impedance spectroscopy a new approach to monitor the formation of the SEI was developed. This way the ki-netics of the interphase could be described using its activation energy. Comparison of these values with the respective resistances regarding the charge turnover during the initial charging of the cell provided additional information about the course of the SEI formation. It could be shown that these findings are in good agreement with the descriptions of the mechanism of the SEI formation provided by the literature.

• 出版日期2016-12