Electrode for electrochemcal device, method for manufacturing the same, and electrochemcal device including the same

Abstract

Provided are an electrode capable of maintaining electrical conductivity during elongation and shrinkage, a method for manufacturing the same, and electrochemical device including the same.

What is claimed is: 
     
         1 . An electrode for an electrochemical device, comprising
 a composite film including an elastic polymer matrix and a first conductive material embedded in the elastic polymer matrix;   a conductive film disposed on the composite film and including a second conductive material; and   an electrode active material layer disposed on the conductive film,   wherein each of the first conductive material and the second conductive material are a gold nanosheet.   
     
     
         2 . The electrode for an electrochemical device of  claim 1 , wherein the gold nanosheet has a diameter of about 10 μm to about 20 μm. 
     
     
         3 . The electrode for an electrochemical device of  claim 1 , wherein the gold nanosheet has a thickness of about 2 nm to about 5 nm. 
     
     
         4 . The electrode for an electrochemical device of  claim 1 , wherein the elastic polymer matrix includes one of block copolymers represented by Chemical Formulae 1 to 4:
   A-block-B  [Chemical Formula 1]
     A-block-B-block-C  [Chemical Formula 2]
     A-block-B-block-C-block-D  [Chemical Formula 3]
   wherein, in Chemical Formulae 1 to 3, A, B, C, and D are the same or different and are independently one of polystyrene, polybutadiene, polybutylene, polyethylene, polyurethane, polyisoprene, or a derivative thereof.   
     
     
         5 . The electrode for an electrochemical device of  claim 1 , wherein the first conductive material is uniformly dispersed and embedded inside the polymer matrix. 
     
     
         6 . The electrode for an electrochemical device of  claim 1 , wherein a weight ratio of the first conductive material/the polymer matrix in the composite film ranges from about 10/100 to about 20/100. 
     
     
         7 . The electrode for an electrochemical device of  claim 1 , wherein the conductive film is disposed on one surface or both surfaces of the composite film. 
     
     
         8 . The electrode for an electrochemical device of  claim 7 , wherein the electrode active material layer is disposed on one surface of the conductive film. 
     
     
         9 . The electrode for an electrochemical device of  claim 1 , wherein the electrode active material layer includes an electrode active material having a particle diameter of about 100 nm to about 200 nm. 
     
     
         10 . The electrode for an electrochemical device of  claim 1 , wherein the composite film has a thickness of about 20 μm to about 40 μm. 
     
     
         11 . The electrode for an electrochemical device of  claim 1 , wherein the conductive film has a thickness of about 1 μm to about 10 μm. 
     
     
         12 . The electrode for an electrochemical device of  claim 1 , wherein the active material layer has a thickness of about 1 μm to about 5 μm. 
     
     
         13 . The electrode for an electrochemical device of  claim 1 , wherein the first conductive material is included in an amount of about 10 wt % to about 20 wt %, the second conductive material is included in an amount of about 30 wt % to about 40 wt %, the electrode active material layer is included in an amount of about 10 wt % to about 15 wt %, and the polymer matrix is included in a balance based on a total amount, 100 wt % of the electrode. 
     
     
         14 . A method for manufacturing an electrode for an electrochemical device, comprising
 transferring a first conductive material on a substrate to form a first conductive film;   spin-coating an elastic polymer solution on the first conductive film to disperse the elastic polymer solution inside and outside the first conductive film;   drying the dispersed elastic polymer solution to form an elastic polymer matrix and to obtain a composite film including a first conductive material embedded inside the elastic polymer matrix;   transferring a second conductive material on the composite film to form a second conductive film; and   forming an active material layer on the second conductive film,   wherein each of the first conductive material and the second conductive material are a gold nanosheet,   
     
     
         15 . The method of  claim 14 , wherein the spin-coating of an elastic polymer solution on the first conductive film to disperse the elastic polymer solution inside and outside the first conductive film is performed at a rotation speed of about 1000 rpm to about 2000 rpm. 
     
     
         16 . The method of  claim 14 , wherein the drying of the dispersed elastic polymer solution to form an elastic polymer matrix and to obtain a composite film including a first conductive material embedded inside the elastic polymer matrix is performed at a temperature range of about 70° C. to about 80° C. 
     
     
         17 . The method of  claim 14 , wherein the transferring of the second conductive material on the composite film to form a second conductive film is transferring the second conductive material on one surface or both surfaces of the composite film twice or more. 
     
     
         18 . The method of  claim 14 , wherein the forming of the active material layer on the second conductive film is performed by spin coating, transferring, spraying, electro-spinning, a hydrothermal synthesis method, a polyol synthesis method, or a solid-phase method. 
     
     
         19 . The method of  claim 14 , wherein the transferring of the first conductive material on a substrate to form a first conductive film is transferring the first conductive material on one surface of the substrate twice or more. 
     
     
         20 . An electrochemical device, comprising
 a positive electrode;   a negative electrode; and   an electrolyte between the positive electrode and the negative electrode,   wherein at least one electrode of the positive electrode and the negative electrode is the electrode of  claim 1 .   
     
     
         21 . The electrochemical device of  claim 20 , wherein the electrolyte is a gel polymer electrolyte. 
     
     
         22 . The electrochemical device of  claim 20 , wherein the electrochemical device is packed with PDMS (polydimethlysiloxane). 
     
     
         23 . The electrochemical device of  claim 20 , wherein the electrochemical device is a rechargeable lithium battery, a sodium rechargeable battery, or a super capacitor. 
     
     
         24 . The electrochemical device of  claim 20 , wherein the electrochemical device is applied to a driving power of a wearable apparatus or a flexible apparatus.