| abstract |
A unit cell according to one embodiment of the present invention has separators and electrodes alternately stacked in the order of a lower separator, a first electrode, an upper separator, and a second electrode. An adhesive is applied to at least one surface of the electrodes and the separators so as to adhere the electrodes and the separators or the lower separator and the upper separator. The adhesive comprises an adhesive composition comprising a copolymer and a rosin ester-based additive, the copolymer comprising 60.1 to 79.9 weight% of two or more alkyl (meth)acrylate repeating units (A) and 20.1 to 39.9 weight% of (meth)acrylate repeating unit (B) having a terminal hydroxyl group, and the adhesive composition comprising 30 to 70 weight% of copolymer and 30 to 70 weight% of additive. |