This technology maximizes the metal capture surface area by coating the surface of acicular inorganic particles within the separator's porous coating layer with amine-based chelating functional groups that coordinate with metal ions, effectively trapping transition metal cations leaching from the cathode.
During high-voltage and high-temperature charging and discharging, transition metal ions such as nickel, manganese, and cobalt leach from the cathode active material and migrate to the anode, where they precipitate. This causes electrode assembly degradation and increased side reactions, limiting battery lifespan.
This technology forms a first coating layer containing chelating functional groups on the surface of acicular inorganic particles like halloysite or alumina. This is then applied with a polymer binder onto one side of a porous substrate, positioning the metal-adsorbing porous coating layer to face the cathode. It can be applied to EV cells using high-nickel, high-voltage cathodes and ESS cells operating in high-temperature environments, extending long-term cycle life by filtering out leached ions before they reach the anode.
This invention was developed with support from the Ministry of Science and ICT for target-specific functional dual-sided separator-based lithium metal batteries.
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