This technology is a composition for separator coating that includes a core-shell structured acrylate copolymer emulsion, where the core consists of an alkyl-group-containing (meth)acrylate and the shell consists of a fluorine-containing (meth)acrylate, designed to suppress moisture adsorption by the separator during aqueous processing.
Conventional aqueous inorganic-coated separators have high moisture affinity, which increases the moisture content inside lithium secondary batteries and degrades battery performance. They also face limitations in heat resistance and adhesion to porous substrates.
This technology introduces fluorine functional groups into the shell of the core-shell copolymer to provide water repellency. By using this in an aqueous coating composition with inorganic fillers, it reduces the moisture affinity of the separator surface while enhancing heat resistance and substrate adhesion. It can be applied to ceramic-coated separators produced via eco-friendly aqueous processes and to high-nickel cell manufacturing, where moisture control is critical, allowing for separators with reduced residual moisture without the use of organic solvents.
This invention was developed with support from the Ministry of Science and ICT for the development of self-reliance and challenging technologies in ICT materials, parts, and equipment.
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