| 摘要 |
PURPOSE: A method for preparing a porous polymer membrane, a separator structure containing a porous polymer membrane, and a lithium secondary battery using the structure are provided, to improve the infiltration velocity of electrolyte and the infiltration amount per unit volume, thereby enhancing the performance of a lithium polymer secondary battery employing the separator structure. CONSTITUTION: The method comprises the steps of preparing a first polymer solution containing a polymer material and a solvent; adding an inorganic compound dispersed in a dispersion medium to the first polymer solution to prepare a second polymer solution; coating a substrate with the second polymer solution; and evaporating the solvent dissolving the polymer. Preferably the dispersion medium of an inorganic compound is a solvent having a polarity similar to that of the solvent dissolving the polymer. Preferably the dispersion medium is selected from the group consisting of methyl alcohol, methylethyl ketone, isopropyl alcohol, ethylene glycol, dimethyl acetate and methylisobutyl alcohol; and the inorganic compound is at least one selected from the group consisting of silica, and aluminium, titanium and sin-based compounds. The separator structure comprises a separator(1); and a porous polymer membrane(2) formed on the surface of a separator.
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