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Analyzing Bending Stresses on Lithium‐Ion Battery Cathodes induced by the Assembly Process
Author(s) -
Schilling Antje,
Schmitt Jan,
Dietrich Franz,
Dröder Klaus
Publication year - 2016
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201600131
Subject(s) - mandrel , separator (oil production) , materials science , bending , composite material , coating , cathode , stress (linguistics) , electrode , battery (electricity) , structural engineering , electrical engineering , engineering , chemistry , linguistics , philosophy , physics , thermodynamics , power (physics) , quantum mechanics
The industrialized winding of electrode–separator composites (ESCs; “jelly rolls”) applies bending stress to the winding mandrel. This affects the mechanical integrity of the substrate's coating and adhesion and may reduce the cycle stability and the battery life. Even though this motivates strong interest in the minimization of bending stress during production, there is no testing method available yet to characterize the composite such that process parameters can be derived. This article introduces a test method and apparatus for the effect of bending stress of electrodes. In this test method, electrodes are pulled over defined radii while the coating adhesion is observed continuously. This resembles the variation of the mandrel diameter and gives detailed insight into the limits of the allowed production parameter window. In a case study, a cathode material with Li(LiMnAl) 2 O 4 (LMO) as active material is selected as an example to show the effectiveness of the method.