UV curable organic-inorganic hybrid coatings on microporous polyethylene separator for enhancing mechanical and electrochemical performance

Abstract UV curable organic-inorganic hybrid coatings were applied to construct a functional ultra-thin layer on the surface of polyethylene (PE) separator without significantly increasing the thickness and sacrificing the initial porous structure of the PE separators. Such a simple and efficient process remarkably enhances a variety of crucial properties of PE separators such as the electrolyte uptake, the ionic conductivity and puncture force, electrochemical property and battery performance. More importantly, compared with the pristine and PE@Organic component modified PE separators, PE@15%SiO 2 (100 nm)/Organic modified PE separator exhibits higher ionic conductivity and puncture force, endowing the cells with excellent capacity retention even at high C-rates and superior cycling performance. Excellent electrochemical performance and enhanced mechanical properties of separators make lithium-ion batteries of high energy density and safety have a more attractive prospect.