Electrode assembly

1. An electrode assembly having a pressure-sensitive adhesive tape attached to an outer circumferential surface thereof,

wherein the pressure-sensitive adhesive tape comprises:

a substrate layer that is swelled along a longitudinal direction when coming in contact with an electrolyte; and

a pressure-sensitive adhesive layer formed on one surface of the substrate layer in a direction parallel to the longitudinal direction of the substrate layer and having a peel strength at room temperature of 100 gf/25 mm or more, as measured at a peel angle of 180° and a peel rate of 5 mm/sec with respect to an electrode assembly or glass plate, and

wherein the substrate layer has a strain of 10% or more in the longitudinal direction according to the following Equation 1:

Strain in longitudinal direction =( L 2 −L 1 )/ L 1 ×100  Equation 1

wherein L 1 is an initial length of the substrate layer before the substrate layer comes in contact with the electrolyte; and

L 2 is a length of the substrate layer, which is measured after the substrate layer comes in contact with the electrolyte at room temperature or 60° C. for 24 hours.

2. The electrode assembly of claim 1 , further comprising:

a positive electrode plate;

a negative electrode plate; and

a separator formed between the positive electrode plate and the negative electrode plate.

3. The electrode assembly of claim 2 , which is wound in a jelly-roll shape.

4. The electrode assembly of claim 1 , wherein the pressure-sensitive adhesive tape is formed into a three-dimensional (3D) structure having a height of 0.001 mm to 2.0 mm in a direction vertical to the longitudinal direction when the pressure-sensitive adhesive tape comes in contact with the electrolyte.

5. The electrode assembly of claim 1 , wherein the substrate layer is one selected from the group consisting of a substrate layer including a urethane bond, a substrate layer including an ester bond, a substrate layer including an ether bond, and a substrate layer including a cellulose ester compound.

6. The electrode assembly of claim 1 , wherein the substrate layer is a cast layer of a composition including an active energy ray-polymerizable acrylate compound and a radical-polymerizable diluent.

7. The electrode assembly of claim 6 , wherein the radical-polymerizable diluent comprises at least one selected from the group consisting of an alkyl (meth)acrylate; a (meth)acrylate having an alkoxy group; a (meth)acrylate having an alicyclic group; a (meth)acrylate having an aromatic group; a (meth)acrylate having a heterocyclic group; and a multifunctional acrylate.

8. The electrode assembly of claim 1 , wherein the substrate layer comprises thermoplastic polyurethane.

9. The electrode assembly of claim 1 , wherein the substrate layer is a cast layer of a curable urethane composition including polyol and isocyanate compounds.

10. The electrode assembly of claim 1 , wherein the substrate layer comprises one selected from the group consisting of a cellulose acetate resin and a cellulose alkylate resin.

11. The electrode assembly of claim 1 , wherein the pressure-sensitive adhesive layer comprises one selected from the group consisting of an acryl pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, an epoxy pressure-sensitive adhesive, a silicon pressure-sensitive adhesive and a rubber pressure-sensitive adhesive.

12. The electrode assembly of claim 1 , wherein the electrolyte is a carbonate-based electrolyte solution.

13. A battery comprising:

the electrode assembly of claim 1 ;

a can having the electrode assembly received therein; and

an electrolyte coming in contact with the electrode assembly inside the can.

14. The battery of claim 13 , wherein the pressure-sensitive adhesive tape of the electrode assembly fixes the electrode assembly inside the can by forming a 3D shape realized by an electrolyte.

15. The battery of claim 13 , wherein the electrolyte is a carbonate-based electrolyte solution.

16. The electrode assembly of claim 1 , wherein the substrate layer has a strain of 10% to 500%.

17. The electrode assembly of claim 1 , wherein the substrate layer has a strain of 30% or more.

18. The electrode assembly of claim 6 , wherein the active energy ray-polymerizable acrylate compound is one selected from the group consisting of urethane acrylate, epoxy acrylate, polyester acrylate and polyether acrylate.