AQUEOUS COMPOSITION OF DIAPHRAGM USED FOR MODIFIED LITHIUM ION BATTERY MODIFIED DIAPHRAGM AND BATTERY

摘要

The present invention relates to a diaphragm used for a modified lithium ion battery, a modified polyolefin diaphragm used for a lithium ion battery, and an aqueous composition of a lithium ion battery, which improve the strength of a lithium ion battery cell, To reduce the thermal expansion of the thickness of the battery and to simplify the manufacturing process of the battery. The aqueous composition of the diaphragm used for the modified lithium ion battery includes an aqueous binder 4 for a lithium ion battery and an organic nanoparticle filler 5 dispersed in such an aqueous binder 4. The organic nanoparticle filler 5 is at least nanoparticles coated with the polymer 1 on the surface or comprises nanoparticles of the polymer 1. The particle size of the organic nanoparticle filler 5 is 50 nm to 2000 nm. The polymer (1) may be at least one selected from the group consisting of polymethyl methacrylate, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-butyl acrylate copolymer, ethylene-methyl acrylate copolymer ethylene- / RTI