In Situ Mechanical Analysis of the Nanoscopic Solid Electrolyte Interphase on Anodes of Li‐Ion Batteries. Issue 16 (14th June 2019)

• Record Type: Journal Article
• Authors: Moeremans, Boaz; Cheng, Hsiu‐Wei; Merola, Claudia; Hu, Qingyun; Oezaslan, Mehtap; Safari, Mohammadhosein; Van Bael, Marlies K.; Hardy, An; Valtiner, Markus; Renner, Frank Uwe
• Is Part Of: Advanced science. Volume 6:Issue 16(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-06-14
• Subjects: Li‐ion batteries -- polymers -- soft matter -- solid–electrolyte interphases -- surface force apparatus; Science -- Periodicals; 505
• DOI: 10.1002/advs.201900190
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: The interfacial decomposition products forming the so‐called solid–electrolyte interphase (SEI) significantly determine the destiny of a Li‐ion battery. Ultimate knowledge of its detailed behavior and better control are required for higher rates, longer life‐time, and increased safety. Employing an electrochemical surface force apparatus, it is possible to control the growth and to investigate the mechanical properties of an SEI in a lithium‐ion battery environment. This new approach is here introduced on a gold model system and reveals a compressible film at all stages of SEI growth. The demonstrated methodology provides a unique tool for analyzing electrochemical battery interfaces, in particular in view of alternative electrolyte formulations and artificial interfaces. Abstract : The solid–electrolyte interphase forms by decomposition of electrolyte at the reactive anode of a Li‐ion battery and poses a major challenge for the battery performance. Using an electrochemical surface forces apparatus adapted to battery environment, the mechanical behavior of the ultrathin layer can be addressed. The force curves reveal a polymeric response during the growth under controlled electrochemical experiments.