This technology is a cathode for lithium secondary batteries, post-processed by uniformly coating the entire surface of a finished NCM-613 cathode on a current collector with a cross-linked poly(4-vinylphenol) polymer. The key feature is the formation of the polymer layer via spin-coating on the finished electrode rather than on the active material powder.
Existing cathode improvement technologies involve coating the surface of active material powder, which poses the problem of requiring changes to already optimized and sensitive electrode manufacturing processes. Furthermore, high-nickel layered cathodes have limitations where high-voltage charging leads to crystal structure changes and electrolyte decomposition, resulting in the accumulation of surface polarization and defects, which degrades cycle life.
In this technology, a cross-linked polymer layer with a PVP content controlled at 0.01–5 wt% relative to the active material and a thickness of 0.05–10 ㎛ mitigates surface polarization and defects, and prevents crystal structure degradation even at a high potential of 4.3 V, thereby improving cycle life, rate capability, and energy density simultaneously. It can be applied to mass production lines for high-nickel lithium-ion batteries for electric vehicles and energy storage systems, allowing for enhanced cell performance through a single post-process while maintaining existing electrode manufacturing processes.
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