BATTERY SEPARATOR WITH EXCELLENT HEAT RESISTANCE AND PUNCTURE STRENGTH AND SECONDARY CELL BATTERY USING SAME

摘要

The present invention relates to a separator for a secondary battery having an excellent shutdown function and heat stability, and excellent adhesive strength and puncture strength. The present invention relates to the separator for a secondary battery comprising: a meta-aramid nano-web which is laminated. The meta-aramid nano-web electrically spins meta-aramid polymer solution including an inorganic filler which is positioned on one side or both sides of a polyolefin nano-web. The meta-aramid nano-web including the inorganic filler is manufactured through electro-spinning. The average fiber diameter of the meta-aramid nano-web is 50-500 nm. The weight per unit area is 2-10 g/m^2. The meta-aramid polymer solution including the inorganic filler which is electrically spun on the polyolefin nano-web includes 5.0-13.5 wt% of polymer. The weight of the inorganic filler is 40-60 wt% of the weight of the meta-aramid polymer. When the spun meta-aramid polymer solution is manufactured, sodium hydroxide is used as a counteractive.