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Polyolefin-based microporous membrane has been widely used as a separator for lithium-ion batteries (LIBs), where they impede an internal short between positive and negative electrodes. Consequently, as the large-scale LIBs targeting electric vehicles (EVs) and energy storage systems (ESSs) is attracting the consumers’ interests, the development of safety enforced separators is getting important. To achieve this goal, the surface coating based on inorganic ceramic particles Al2O3, SiO2, MgO, CaCO3, and etc. have been widely used to improve the mechanical and the thermal properties of the separators. However, the detachment of ceramic composites from the separator surface, which happens during separator preparation and cell assembly process, can cause serious problems in safety and cell performance of LIBs. Unfortunately, however, there is no quantitative manner to examine the adhesion strength between ceramic composite layer and the separator surface yet. Here in, we introduced a Surface and Interfacial Cutting and Analysis System (SAICAS) to fulfil this purpose. Contrary to the traditional peel-off technique, SAICAS can measure the adhesion strength at a specific depth of coating of operator. Thus, SAICAS can compare adhesion properties in a systematic manner. We measured the adhesion strength between the ceramic coating layer and the separator, and moreover, the adhesion strength inside the coating layer. Furthermore, we could compare the adhesion strength measured via traditional peel-off test technique. Finally, we investigated the adhesion strength of ceramic coating layer as a function of types and composite ratio of polymeric binder. Acknowledgement This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2014R1A1A1005861). |
