One-sided electrode with reduced twisting for a secondary battery, and method for producing same

Abstract

The present invention provides a one-sided electrode for a secondary battery comprising a current collector, an electrode mixture layer applied to one surface of the current collector, and an electrode distortion-preventing layer formed on the other surface of the current collector to which no electrode mixture is applied. The one-sided electrode according to the present invention exhibits significantly reduced warping or curling after a rolling process and has the advantages of facilitating subsequent processes and enabling enhanced productivity.

1 . A one-sided electrode for a secondary battery, comprising:
 a current collector;   an electrode mixture layer applied on one surface of the current collector; and   an electrode distortion-preventing layer formed on another surface of the current collector on which no electrode mixture is applied,   wherein the electrode distortion-preventing layer comprises an insulating polymer material.   
     
     
         2 . The one-sided electrode of  claim 1 , wherein thickness of the electrode mixture layer is between 1 μm and 70 μm. 
     
     
         3 . The one-sided electrode of  claim 1 , wherein a tensile strength of the electrode distortion-preventing layer is 80% to 120% of a tensile strength of the electrode mixture layer, 
     
     
         4 . The one-sided electrode of  claim 1 , wherein the insulating polymer comprises one or more selected from the group consisting of polyethylene, polypropylene, polybutylene, polystyrene, polyethylene terephthalate, natural rubber, and synthetic rubber. 
     
     
         5 . The one-sided electrode of  claim 1 , wherein the one-sided electrode includes only one current collector. 
     
     
         6 . A secondary battery comprising the one-sided electrode according to  claim 1 . 
     
     
         7 . A method of manufacturing the one-sided electrode for the secondary battery according to  claim 1 , comprising the steps of:
 (a) laminating the electrode distortion-preventing layer on the one surface of the current collector and subsequently applying heat and pressure;   (b) applying an electrode active material slurry including an electrode active material and a solvent on the another surface of the current collector;   (c) drying the electrode coated with the electrode active material slurry; and   (d) rolling the electrode to have a predetermined thickness,   wherein the electrode distortion-preventing layer comprises an insulating polymer material.