发明名称 |
PREPARATION METHOD OF SEPARATOR WITH HIGH TENSILE STRENGTH FOR LITHIUM SECONDARY BATTERY AND THE LITHIUM SECONDARY BATTERY THEREBY |
摘要 |
A method for preparing a separator for a lithium secondary battery, a separator prepared by the method, and a lithium secondary battery containing the separator are provided to improve ion conductivity and mechanical properties by introducing a symmetric structure to a separator. A method for preparing a separator for a lithium secondary battery comprises the steps of dissolving a vinylidene fluoride-based polymer in a solvent to prepare a polymer solution and adding a nonsolvent to the polymer solution to prepare an oversaturated polymer solution; casting the polymer solution on a substrate and evaporating the solvent to obtain a film-shaped polymer membrane; and adding the polymer membrane to a nonsolvent to form a pore by phase transition method. Preferably the nonsolvent is at least one selected from methanol, ethanol, propanol, water, acetone, THF, dimethylformamide, N-methylpyrrolidone and methylisobutylketone. |
申请公布号 |
KR20080046920(A) |
申请公布日期 |
2008.05.28 |
申请号 |
KR20060116592 |
申请日期 |
2006.11.23 |
申请人 |
KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY |
发明人 |
PARK, JUNG KI;SEOL, WAN HO;LEE, YONG MIN;LEE, JUN YOUNG;HAN, YOUNG DAL;RYOU, MYEONG HYEON |
分类号 |
H01M2/14;H01M10/02 |
主分类号 |
H01M2/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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