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|1. (WO2017032304) MODIFIED CERAMIC COMPOSITE SEPARATOR FILM AND MANUFACTURING METHOD THEREOF|
|Title:||MODIFIED CERAMIC COMPOSITE SEPARATOR FILM AND MANUFACTURING METHOD THEREOF|
Disclosed in the present invention are a modified ceramic composite separator film and application thereof. The modified ceramic composite separator film comprises an organic separator film substrate and a ceramic layer coated on a surface of the separator film substrate in a thickness of 0.1 μm to 20 μm, and also comprises dopamine polymer or other polymer grown on surfaces of the separator film substrate and the ceramic layer and grown in-situ therein, wherein inorganic powder in the ceramic layer has a particle size of 5 nm to 10 μm, and the material of the organic separator film substrate has a molecular weight of 1000 to 100000000. The modified ceramic composite separator film of the present invention can effectively reduce the come-off of powder of the ceramic layer and the safety concern caused by liquid leakage, effectively improve the physical performance and electrochemical performance of the separator film, and also increase the interface stability of the separator between electrolytes and electrodes which can effectively inhibit the growth of lithium dendrites, and therefore is advantageous in increasing the capacity retention capability of a battery.