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Abstract: Given the global demand for green energy, the battery industry is positioned to be an important
future technology. Lithium-ion batteries (LIBs), which are the most widely used battery in the market, are
the focus of various research and development efforts, from materials to systems, that seek to improve their
performance. The separator is one of the core materials in LIBs and is a significant factor in the lifespan of
high-performance batteries. To improve the performance of present LIBs, electrochemical testing and related
surface analyses of the separator is essential. In this paper, we prepared a ceramic (Boehmite, γ-AlOOH)
coated polypropylene separator and a porous polyimide separator to compare their electrochemical properties
with a commercialized polypropylene (PP) separator. The prepared separators were assembled into nickelmanganese-cobalt (NMC) cathode half-cell and full-cell lithium-ion batteries. Their cycling performances were
evaluated using differential capacity and electrochemical impedance spectroscopy with ethylene
carbonate:dimethylcarbonate (EC:DMC) electrolyte. The ceramic coated polypropylene separator exhibited the
best cycle performance at a high 5 C rate, with high ionic conductivity and less resistive solid electrolyte
interphase. Also, it was confirmed that a separator solid electrolyte interface (SSEI) layer formed on the
separator with cycle repetition, and it was also confirmed that this phenomenon determined the cycle life of
the battery depending on the electrolyte
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