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Free keywords:
Ions; Polymers; Seebeck effect; Solid electrolytes; Solid-State Batteries, Artificial interfaces; Decomposition products; Electrochemical batteries; Electrochemical surfaces; Electrolyte formulation; Soft matter; Solid electrolyte interphase; Surface force apparatus, Lithium-ion batteries
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. © 2019 The Authors. Published by WILEY-VCH Verlag GmbH Co. KGaA, Weinheim