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This invention discloses an Angiopep-2 modified fluorescent polyamide-amine dendritic polymer and its preparation method, as well as a method for preparing nanoparticles based thereon, belonging to the field of nanomaterials technology. The preparation method includes the following steps: mixing the polyamide-amine dendritic polymer with a first phosphate buffer to obtain solution I; mixing maleimide-polyethylene glycol-N-hydroxysuccinimide with the first phosphate buffer to obtain solution II; mixing solution I and solution II and reacting them, followed by ultrafiltration purification to obtain intermediate A; dissolving Angiopep-2 in a second phosphate buffer and reacting it with intermediate A, followed by freeze-drying to obtain intermediate B; dissolving intermediate B in a dimethyl sulfoxide solution to obtain solution III; dissolving fluorescein isothiocyanate in a dimethyl sulfoxide solution to obtain solution IV; mixing solutions III and IV and reacting them under a protective gas atmosphere in the dark; freeze-drying to obtain the Angiopep-2 modified fluorescent polyamide-amine dendritic polymer.

Disclosed are a separator-integrated electrode, a method of manufacturing the same, and an electrode assembly and a rechargeable lithium battery including the same. The separator-integrated electrode includes an electrode and a polymer fiber layer on the electrode. The polymer fiber layer comprises polyacrylic acid. The polymer fiber layer has a tensile strength in the MD direction of greater than or equal to about 120 kgf / cm2. The polymeric fiber layer has an air permeability of less than or equal to about 500 sec / 100 cc.