Impact of the Crystalline Li15Si4 Phase on the Self-Discharge Mechanism of Silicon Negative Electrodes in Organic Electrolytes

• Published in: ACS applied materials & interfaces Vol. 12; no. 50; pp. 55903 - 55912
• Main Authors: Bärmann, Peer, Krueger, Bastian, Casino, Simone, Winter, Martin, Placke, Tobias, Wittstock, Gunther
• Format: Journal Article
• Language: English
• Published: American Chemical Society 16.12.2020
• Subjects: electrochemistry; electrodes; electrolytes; Energy, Environmental, and Catalysis Applications; phase transition; silicon; surface area; Lithium-ion batteries; Li15Si4 phase; silicon; self-discharge; solid electrolyte interphase (SEI); scanning electrochemical microscopy (SECM)

Because of their high specific capacity and rather low operating potential, silicon-based negative electrode materials for lithium-ion batteries have been the subject of extensive research over the past 2 decades. Although the understanding of the (de)­lithiation behavior of silicon has significantl...