Heat resistant layer composition, lithium secondary battery separator comprising heat resistant layer formed therefrom, and lithium secondary battery comprising same
A technology of heat-resistant layer and composition, which is applied in the direction of secondary batteries, lithium batteries, battery pack components, etc., and can solve the problems that it is difficult to fully ensure the wet heat shrinkage characteristics of batteries
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Synthetic example
[0132] Synthesis example: Preparation of acrylic acid copolymer
Synthetic example 1
[0134] Distilled water (6361g), acrylic acid (72.06g, 1.0mol), acrylamide (604.1g, 8.5mol), potassium persulfate (2.7g, 0.01mol), 2-acrylamido-2-methylpropanesulfonic acid ( 103.6 g, 0.5 mol) and 5N lithium hydroxide aqueous solution (based on the total amount of 2-acrylamido-2-methylpropanesulfonic acid, 1.05 equivalents) were put into a 10 L four-necked flask equipped with a stirrer, a thermometer and a condenser , and the internal pressure of the flask was reduced to 10mmHg with a diaphragm pump, and then returned to normal pressure with nitrogen, and repeated three times.
[0135] The reaction solution was controlled to be stable between 65°C and 70°C for 12 hours. The reaction solution was cooled down to room temperature and adjusted to have a pH in the range of 7 to 8 by using 25% aqueous ammonia solution.
[0136] In this method, poly(acrylic acid-co-acrylamide-co-2-acrylamido-2-methylpropanesulfonic acid) sodium salt is prepared. The molar ratio of acrylic acid, acry...
Embodiment 1
[0139] A bond comprising 3 parts by weight of a crosslinking agent (glyoxane, Sigma-Aldrich Co., Ltd.) (based on 100 parts by weight of the acrylic copolymer (10 wt% in distilled water) according to Synthesis Example 1) agent and alumina (Al 2 o 3 , with an average particle diameter of 500 nm, Sumitomo Corp.) was added to the solvent at a weight ratio of 1:28, and then ground and dispersed at 25° C. for 30 minutes to prepare an inorganic dispersion. Subsequently, water was added thereto to have a total solid content of 25% by weight to prepare a heat-resistant layer composition. In the bar coating method, the composition was coated to a thickness of 3 μm on an 8 μm thick polyethylene porous substrate (air permeability: 120 sec / 100 cc, piercing strength: 480 kgf, SK Global Chemical Co., Ltd.), Then, it was dried at 70° C. for 10 minutes to manufacture a separator for a lithium secondary battery cell.
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