Positive electrode for nonaqueous secondary battery, method for forming the same, nonaqueous secondary battery, and electrical device

Abstract

A positive electrode for a nonaqueous secondary battery including an active material layer which has sufficient electron conductivity with a low ratio of a conductive additive is provided. A positive electrode for a nonaqueous secondary battery including an active material layer which is highly filled with an active material, id est, including the active material and a low ratio of a conductive additive. The active material layer includes a plurality of particles of an active material with a layered rock salt structure, graphene that is in surface contact with the plurality of particles of the active material, and a binder.

What is claimed is: 
     
         1 . A method for forming a positive electrode, comprising the steps of:
 forming a dispersion liquid comprising graphene oxide;   forming a mixture by mixing an active material having a layered rock salt structure with the dispersion liquid; and   reducing the graphene oxide.   
     
     
         2 . The method for forming a positive electrode according to  claim 1 , further comprising the steps of:
 forming a paste by mixing a binder with the mixture after forming the mixture;   applying the paste to a current collector to form an active material layer; and   drying the paste.   
     
     
         3 . The method for forming a positive electrode according to  claim 1 , wherein the graphene oxide is a single layer or a multilayer including more than or equal to 2 layers and less than or equal to 100 layers. 
     
     
         4 . The method for forming a positive electrode according to  claim 1 ,
 wherein the reducing is performed after forming the mixture.   
     
     
         5 . A method for forming a positive electrode, comprising the steps of:
 forming a paste by mixing an active material having a layered rock salt structure, graphene oxide, a binder and a dispersion medium;   applying the paste to a current collector to form an active material layer; and   reducing the graphene oxide after applying the paste.