POROUS SEPARATOR FOR A SECONDARY BATTERY INCLUDING CELLULOSE NANOFIBERS AND METHOD FOR MANUFACTURING SAME

摘要

The present invention relates to a separator for a secondary battery including cellulose nanofibers, and to a method for manufacturing same. The separator has a minute porous structure formed between cellulose nanofibers, and the porous structure has a porosity of 10 to 80% (v/v) and a pore size of 0.01 to 10 mum. The thickness of the separator is 5 to 30 mum. The separator has good thermal stability, dimensional stability, wettability and electrochemical stability, and the manufacturing process may be simplified to decrease unit production cost.