New Analytical Method to Reveal the Adhesion Properties in the Composite Electrodes for Lithium-Ion Batteries

Abstract

Adhesion properties such as adhesion strength within the composite electrodes are receiving considerable attention as their loading levels increase ceaselessly for higher energy density. Without controlling those properties appropriately within the electrode, not only short-term electrochemical performance but also long-term reliability cannot be secured. To address this limitation, a new analysis tool, surface and interfacial cutting analysis system (SAICAS), has been developed and utilized to investigate the adhesion properties of the composite electrodes for lithium-ion batteries (LIBs). Comparing to the conventional peel test, the SAICAS can provide the horizontal force during peeling process at any depths in the composite electrode. So, those horizontal forces have some relationship with the real adhesion strength. In this work, we will introduce the measuring principles and applications of the SAICAS for the composite electrodes of LIBs. With a number of composite electrodes having different compositions and design parameters (loading and density), we confirm that the SAICAS can provide reliable adhesion strengths in the bulk as well as at the interface. Moreover, with the adhesion strengths at different depths, the polymeric distribution within the electrode can be estimated directly and efficiently without conducting complex and time-consuming post analysis works.