Graphene oxide, positive electrode for nonaqueous secondary battery using graphene oxide, method of manufacturing positive electrode for nonaqueous secondary battery, nonaqueous secondary battery, and electronic device

Abstract

A graphene oxide used as a raw material of a conductive additive for forming an active material layer with high electron conductivity with a small amount of a conductive additive is provided. A positive electrode for a nonaqueous secondary battery using the graphene oxide as a conductive additive is provided. The graphene oxide is used as a raw material of a conductive additive in a positive electrode for a nonaqueous secondary battery and, in the graphene oxide, the atomic ratio of oxygen to carbon is greater than or equal to 0.405.

1 . (canceled) 
     
     
         2 . A method for manufacturing a positive electrode, comprising the steps of:
 adding a plurality of active material particles to a dispersion medium to obtain a first mixture;   kneading the first mixture to obtain a second mixture; and   adding a binder to the second mixture,   wherein the dispersion medium comprises a carbon material, and   wherein the binder is capable of adhering the plurality of active material particles and the carbon material.   
     
     
         3 . The method for manufacturing a positive electrode, according to  claim 2 , further comprising the steps of:
 applying the second mixture onto a positive electrode current collector; and   evaporating the dispersion medium in the second mixture after applying the second mixture.   
     
     
         4 . The method for manufacturing a positive electrode, according to  claim 2 , wherein the binder comprises any one of polvinyliden fluoride, polyimide, polytetrafluoroethylene, polyvinyl chloride, ethylene-propylene-diene polymer, styrene-butadiene rubber, acrylonitrile-butadiene rubber, fluorine rubber, polyvinyl acetate, polymethyl methacrylate, polyethylene and nitrocellulose. 
     
     
         5 . A method for manufacturing a positive electrode, comprising the steps of:
 adding a plurality of active material particles and a binder to a dispersion medium to obtain a first mixture; and   mixing the first mixture to obtain a second mixture,   wherein the dispersion medium comprises a carbon material, and   wherein the binder is capable of adhering the plurality of active material particles and the carbon material.   
     
     
         6 . The method for manufacturing a positive electrode, according to  claim 5 , further comprising the steps of:
 applying the second mixture onto a positive electrode current collector; and   evaporating the dispersion medium in the second mixture after applying the second mixture.   
     
     
         7 . The method for manufacturing a positive electrode, according to  claim 5 , wherein the binder comprises any one of polvinyliden fluoride, polyimide, polytetrafluoroethylene, polyvinyl chloride, ethylene-propylene-diene polymer, styrene-butadiene rubber, acrylonitrile-butadiene rubber, fluorine rubber, polyvinyl acetate, polymethyl methacrylate, polyethylene and nitrocellulose. 
     
     
         8 . A method for manufacturing an electrode, comprising the steps of:
 kneading a first mixture comprising an active material particle, a piece of graphene oxide and a first solvent to obtain a second mixture;   adding a second solvent to the second mixture to obtain a third mixture; and   applying the third mixture to make an active material layer.   
     
     
         9 . The method for manufacturing an electrode, according to  claim 8 , further comprising the step of:
 adding a binder to the second mixture.   
     
     
         10 . The method for manufacturing an electrode, according to  claim 8 , wherein a primary particle size is less than or equal to 500 nm. 
     
     
         11 . The method for manufacturing an electrode, according to  claim 8 , wherein the active material particle comprises a lithium-containing composite oxide. 
     
     
         12 . The method for manufacturing an electrode, according to  claim 11 , wherein the lithium-containing composite oxide is any one of LiCoO 2 , NiCo-containing composite oxide, LiMPO 4  (where M is one or more of Fe, Mn, Co and Ni).