Premium
The Sound of Batteries: An Operando Acoustic Emission Study of the LiNiO 2 Cathode in Li–Ion Cells
Author(s) -
Schweidler Simon,
Bianchini Matteo,
Hartmann Pascal,
Brezesinski Torsten,
Janek Jürgen
Publication year - 2020
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.202000099
Subject(s) - materials science , cathode , acoustic emission , electrolyte , electrode , electrochemistry , degradation (telecommunications) , oxide , chemical engineering , composite material , metallurgy , chemistry , electrical engineering , engineering
The development of advanced Li‐ion batteries relies on the implementation of high‐capacity Ni‐rich layered oxide cathode materials, such as NCM and NCA, among others. However, fast performance decay because of intrinsic chemical and structural instabilities hampers their practical application. Hence, thoroughly understanding degradation processes is crucial to overcome current limitations. To monitor instabilities of electrode materials under realistic operating conditions, the application of nondestructive operando techniques is required. While structural changes of crystalline phases can be studied by X‐ray diffraction, microstructural changes (e. g., particle fracture) cannot be easily accessed in situ and are therefore mostly investigated ex situ . Here, we use acoustic emission (AE) measurements to probe a potential next‐generation cathode material in real‐time. Specifically, we focus on LiNiO 2 (LNO) and demonstrate that AE events in different frequency ranges can be correlated with the formation of the cathode solid‐electrolyte interphase and the mechanical degradation during electrochemical cycling.