Electrode for battery, battery having electrode and method for manufacturing electrode and battery having electrode

Abstract

The electrode includes a current collector 110, an active material layer 111 formed on at least one side of the current collector 110 and an insulating layer 112 formed on the surface of the active material layer 111. The electrode was formed so that peeling occurs between the current collector 110 and the active material layer 111 and the peeling strength was 10 mN/mm or more when a 90° peeling test was performed at a peeling rate of 100/min.

1 . An electrode for a battery comprising:
 a current collector,   an active material layer formed on at least one surface of the current collector,   an insulating layer formed on a surface of the active material layer, and   wherein peeling occurs between the current collector and the active material layer and a peeling strength thereof is 10 mN/mm or more when a 90° peeling test is carried out at a peeling rate of 100 mm/min.   
     
     
         2 . The electrode according to  claim 1 , wherein the current collector and the active material layer are the current collector for a positive electrode. 
     
     
         3 . The electrode according to  claim 2 , wherein the active material layer for the positive electrode includes polyvinylidene fluoride as a binder. 
     
     
         4 . The electrode according to  claim 1 , wherein the current collector and the active material layer are the current collector and the active material layer for a negative electrode. 
     
     
         5 . The electrode according to  claim 4 , wherein the active material layer for the negative electrode includes at least one of styrene butadiene rubber, polyacrylic acid and polyvinylidene fluoride as a binder. 
     
     
         6 . The electrode according to  claim 1 , wherein the active material layer includes N-methyl-2-pyrrolidone. 
     
     
         7 . A battery comprising:
 at least one positive electrode,   at least one negative electrode disposed to face the positive electrode, and   wherein at least one of the positive electrode and the negative electrode includes a current collector, an active material layer formed on at least one surface of the current collector, and an insulating layer formed on a surface of the active material layer, and peeling occurs between the current collector and the active material layer and a peeling strength thereof is 10 mN/mm or more when a 90° peeling test is carried out at a peeling rate of 100 mm/min.   
     
     
         8 . The battery according to  claim 7 , wherein the positive electrode and the negative electrode are disposed to face each other with the insulating layer interposed therebetween. 
     
     
         9 . The battery according to  claim 7 , further comprising a separator disposed between the positive electrode and the negative electrode. 
     
     
         10 . The battery according to  claim 7 , wherein the active material layer includes polyvinylidene fluoride as a binder. 
     
     
         11 . The battery according to  claim 7 , wherein the active material layer includes N-methyl-2-pyrrolidone. 
     
     
         12 . A method for manufacturing an electrode for a battery, the method comprising;
 forming an active material layer on at least one surface of a current collector,   forming an insulating layer such that the insulating layer is finally laminated on a surface of the active material layer, and   wherein at least one of a material of the active material layer, a formation condition of the active material layer, a material of the insulating layer and a formation condition of the insulating layer is determined such that peeling occurs between the current collector and the active material layer and a peeling strength thereof is 10 mN/mm or more when a 90° peeling test is carried out at a peeling rate of 100 mm/min.   
     
     
         13 . The method for manufacturing the electrode according to  claim 12 ,
 wherein the step of forming the active material layer comprises:   applying a mixture for the active material layer in which an active material and a binder are dispersed in a solvent,   drying the mixture for the active material layer after the mixture is applied, and   compression-molding the mixture for the active material layer after the mixture is dried, and   wherein the step of forming the insulating layer comprises:   applying a mixture for the insulating layer in which an insulating material and a binder are dispersed in a solvent,   drying the mixture for the insulating layer after the mixture is applied, and   compression-molding the mixture for the insulating layer after the mixture is dried.   
     
     
         14 . The method for manufacturing the electrode according to  claim 13 ,
 wherein the step of applying the mixture for the active material layer,   the step of drying the mixture for the active material layer,   the step of compression-molding the mixture for the active material layer,   the step of applying the mixture for the insulating layer,   the step of drying the mixture for the insulating layer and   the step of compression-molding the mixture for the insulating layer   are carried out in this order.   
     
     
         15 . The method for manufacturing the electrode according to  claim 13 ,
 wherein the step of applying the mixture for the active material layer,   the step of drying the mixture for the active material layer,   the step of applying the mixture for the insulating layer and   the step of drying the mixture for the insulating layer   are carried out in this order, and   wherein the step of compression-molding the mixture for the active material layer and the step of compression-molding the mixture for the insulating layer are carried out simultaneously after the step of drying the mixture for the insulating layer.   
     
     
         16 . The method for manufacturing the electrode according to  claim 13 ,
 wherein the step of applying the mixture for the active material layer and   the step of applying the mixture for the insulating layer   are carried out in this order,   the step of drying the mixture for the active material layer and the step of drying the mixture for the insulating layer are carried out simultaneously after the step of applying the mixture for the insulating layer, and   the step of compression-molding the mixture for the active material layer and the step of compression-molding the mixture for the insulating layer are carried out simultaneously thereafter.   
     
     
         17 . The method for manufacturing the electrode according to  claim 13 , wherein the mixture for the active material layer includes polyvinylidene fluoride as the binder. 
     
     
         18 . The method for manufacturing the electrode according to  claim 13 , wherein the mixture for the active material layer includes N-methyl-2-pyrrolidone as the solvent.