Multi-layered graphene films, energy storage devices using multi-layered graphene films as electrodes, and methods of manufacturing multi-layered graphene films and energy storage devices

Abstract

Provided are a multi-layered graphene film, a method of manufacturing the multi-layered graphene film, and an energy storage device using the multi-layered graphene film as an electrode. The multi-layered graphene film includes a first graphene layer, a spacer layer provided on the first graphene layer, and an upper graphene layer provided on the spacer layer. The spacer layer is provided to maintain a desired distance between the first graphene layer and the upper graphene layer. A plurality of layers with different layer configurations are further provided between the spacer layer and the upper graphene layer. The spacer layer may a graphene or a graphene oxide layer.

What is claimed is: 
     
         1 . A multi-layered graphene film comprising:
 a first graphene layer;   a spacer layer on the first graphene layer; and   an upper graphene layer on the spacer layer,   wherein a height of the spacer layer maintains a desired distance between the first graphene layer and the upper graphene layer.   
     
     
         2 . The multi-layered graphene film of  claim 1 , wherein a plurality of layers with different layer configurations are further provided between the spacer layer and the upper graphene layer. 
     
     
         3 . The multi-layered graphene film of  claim 1 , wherein the first graphene layer is on a metal film. 
     
     
         4 . The multi-layered graphene film of  claim 2 , wherein the plurality of layers with different layer configurations comprises one or more combinations of an additional graphene layer and an additional spacer layer stacked between the spacer layer and the upper graphene layer. 
     
     
         5 . The multi-layered graphene film of  claim 1 , wherein
 the spacer layer comprises a second graphene layer, and   the second graphene layer has a different layer configuration than the first graphene layer and the upper graphene layer.   
     
     
         6 . The multi-layered graphene film of  claim 1 , wherein the spacer layer is an oxide layer. 
     
     
         7 . The multi-layered graphene film of  claim 5 , wherein
 the second graphene layer comprises a plurality of graphene sheet fragments that are spaced apart from each other in a planar direction of the second graphene layer, and   the first graphene layer comprises at least one graphene sheet that has a larger surface area than a total surface area of the plurality of graphene sheet fragments.   
     
     
         8 . The multi-layered graphene film of  claim 6 , wherein the oxide layer is a graphene oxide layer. 
     
     
         9 . The multi-layered graphene film of  claim 4 , wherein
 the spacer layer comprises a second graphene layer, and   the second graphene layer has a different layer configuration than the first graphene layer and the upper graphene layer.   
     
     
         10 . The multi-layered graphene film of  claim 4 , wherein the spacer layer is an oxide layer. 
     
     
         11 . A method of manufacturing a multi-layered graphene film, the method comprising:
 forming a first graphene layer on a substrate;   forming a spacer layer on the first graphene layer; and   forming an upper graphene layer on the spacer layer,   wherein the spacer layer maintains a desired distance between the first graphene layer and the upper graphene layer.   
     
     
         12 . The method of  claim 11 , wherein a plurality of layers with different layer configurations are further formed between the spacer layer and the upper graphene layer. 
     
     
         13 . The method of  claim 12 , wherein the plurality of layers with different layer configurations comprises one or more combinations of an additional graphene layer and an additional spacer layer stacked on the spacer layer. 
     
     
         14 . The method of  claim 11 , wherein
 the spacer layer comprises a second graphene layer, and   the second graphene layer has a different layer configuration than the first graphene layer and the upper graphene layer.   
     
     
         15 . The method of  claim 11 , wherein the spacer layer is a graphene oxide layer. 
     
     
         16 . The method of  claim 14 , wherein
 the second graphene layer comprises a plurality of graphene sheet fragments that are spaced apart from each other in a planar direction of the second graphene layer, and   the first graphene layer comprises at least one graphene sheet that has a larger surface area than a total surface area of the plurality of graphene sheet fragments.   
     
     
         17 . The method of  claim 11 , wherein the forming of the first graphene layer on the substrate comprises:
 forming a first graphene sheet on a first temporary substrate;   attaching a first stamper to the first graphene sheet;   removing the first temporary substrate;   attaching the first graphene sheet, to which the first stamper is attached, on the substrate; and   removing the first stamper.   
     
     
         18 . The method of  claim 11 , wherein the forming of the spacer layer on the first graphene layer comprises:
 forming a plurality of graphene sheet fragments on a second temporary substrate;   attaching a second stamper to the plurality of graphene sheet fragments;   removing the second temporary substrate;   attaching the plurality of graphene sheet fragments, to which the second stamper is attached, to the first graphene layer; and   removing the second stamper.   
     
     
         19 . The method of  claim 18 , wherein the plurality of graphene sheet fragments are formed with a shorter graphene growth time than the first graphene layer. 
     
     
         20 . The method of  claim 17 , wherein the first temporary substrate is a metal substrate. 
     
     
         21 . The method of  claim 18 , wherein the second temporary substrate is a metal substrate. 
     
     
         22 . The method of  claim 11 , wherein the forming of the spacer layer on the first graphene layer comprises:
 forming a graphene layer on a temporary substrate;   changing the graphene layer, formed on the temporary substrate, into a graphene oxide layer;   forming a stamper on the graphene oxide layer;   removing the temporary substrate; and   transferring the graphene oxide layer onto the first graphene layer and removing the stamper.   
     
     
         23 . The method of  claim 22 , wherein the graphene oxide layer is formed by ultraviolet-treating the graphene layer formed on the temporary substrate. 
     
     
         24 . The method of  claim 13 , wherein
 the spacer layer comprises a second graphene layer, and   the second graphene layer has a different layer configuration than the first graphene layer and the upper graphene layer.   
     
     
         25 . The method of  claim 13 , wherein the spacer layer is a graphene oxide layer. 
     
     
         26 . An energy storage device comprising a first electrode, a separator, a second electrode, and an electrolyte that are sequentially stacked,
 wherein the first electrode and the second electrode comprise a multi-layered graphene film of  claim 1 .   
     
     
         27 . The energy storage device of  claim 26 , wherein the first electrode, the separator, and the second electrode are provided between a cap and a can. 
     
     
         28 . The energy storage device of  claim 27 , wherein an elastic member is further provided between the second electrode and the cap. 
     
     
         29 . The energy storage device of  claim 26 , wherein a gasket is provided between the cap and the can. 
     
     
         30 . The energy storage device of  claim 26 , wherein
 the first electrode and the second electrode comprise a metal film together with the multi-layered graphene film, and   the multi-layered graphene film of the first electrode and the multi-layered graphene film of the second electrode face each other with the separator therebetween.   
     
     
         31 . A method of manufacturing an energy storage device, the method comprising:
 mounting a first electrode on a can;   mounting a separator on the first electrode;   mounting a second electrode on the separator;   mounting a gasket contacting the can;   mounting an elastic member on the second electrode;   mounting a cap on the elastic member; and   pressing the cap until the gasket and the cap are closely coupled with each other,   wherein   an electrolyte is injected into the electrode before the mounting of the elastic member, and   the first electrode and the second electrode comprise the multi-layered graphene film of  claim 1 .   
     
     
         32 . The method of  claim 31 , wherein a desired amount of the electrolyte is dropped onto the first electrode before the separator is mounted on the first electrode. 
     
     
         33 . The method of  claim 32 , wherein a desired amount of the electrolyte is dropped onto the separator after the separator is mounted on the first electrode.