SEPARATOR FOR RECHARGEABLE LITHIUM BATTERY AND RECHARGEABLE LITHIUM BATTERY INCLUDING THE SAME

Provided are a separator for a rechargeable lithium battery, and a rechargeable lithium battery including the separator. The separator for a rechargeable lithium battery includes a porous substrate, and a first layer located on at least one surface of the porous substrate. The first layer includes a binder and a filler. The binder includes a mixture of a first binder and a second binder. The second binder is an adhesive binder, the second binder includes one or more of polyvinyl alcohol, polyacrylic acid, and poly(vinyl alcohol-co-acrylic acid). The filler includes a mixture of cellulose-based nanofibers having a carboxyl group, cellulose-based nanocrystals having a carboxyl group, and a filler that is not surface-modified.