Separation membrane comprising coating layer and battery using same
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example 1
(1) Preparation of Coating Composition
[0134]0.5 mol of 3,3′-diamino diphenyl sulfone (DDS), and N,N-dimethylacetamide (DMAc) were placed in a four-neck flask equipped with a stirrer, a temperature controlling device, a nitrogen gas injection device, and a condenser while passing nitrogen therethrough, and dissolved with stirring. Next, 0.5 mol of pyromellitic dianhydride (PMDA) in a solid state was added to the solution, and the solution was vigorously stirred. Herein, the solid content by mass ratio was 20% by weight, and the reaction proceeded for 24 hours while maintaining the temperature less than 25° C. to prepare a polyamic acid solution.
[0135]In order to prepare an inorganic dispersion, 25% by weight of Al2O3 (LS235, Nippon Light Metal Company, Ltd.) was added to acetone (Daejung Chemical & Metals Co., Ltd.), and milled at 25° C. for 3 hours using a beads mill to be dispersed, thereby preparing an inorganic dispersion.
[0136]The thus prepared, polyamic acid solution and inorga...
example 2
[0138]The separator was prepared by the same method as in above Example 1, except that 1,6-hexamethylenediamine was placed in the four-neck flask instead of 3,3′-diaminodiphenylsulfone, and the mixing was carried out in a weight ratio of the prepared polyamic acid solution:N,N-dimethylacetamide (DMAc):inorganic dispersion:acetone=0.9:1.5:4.1:3.5, in the preparation of the coating composition.
example 3
[0139]The separator was prepared by the same method as in above Example 1, except that 4,4′-oxydianiline was placed in the four-neck flask instead of 3,3′-diaminodiphenylsulfone, the solid content of the polyamic acid solution by mass ratio was 10% by weight, and the mixing was carried out in a weight ratio of the prepared polyamic acid solution:N,N-imethylacetamide (DMAc):inorganic dispersion:acetone=0.9:2.8:4.1:2.2, in the preparation of the coating composition.
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