Conductive two-dimensional particle and method for producing the same

Abstract

A conductive two-dimensional particle of a layered material comprising one layer or one layer and plural layers, wherein the layer includes a layer body represented by: MmXn, and a modifier or terminal T exists on a surface of the layer body, wherein T is at least one selected from the group consisting of a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, or a hydrogen atom; and a monovalent metal ion, wherein the conductive two-dimensional particle does not contain an amine, a total content of chlorine and bromine in the conductive two-dimensional particle is 1,500 ppm by mass or less, and an average value of a major diameter of a two-dimensional surface of the conductive two-dimensional particle is 1.0 μm to 20 μm.

1 . A conductive two-dimensional particle of a layered material comprising one layer or one layer and plural layers, wherein the layer includes a layer body represented by:
   M m X n      wherein M is at least one metal of Group 3, 4, 5, 6, or 7,   X is a carbon atom, a nitrogen atom, or a combination thereof,   n is 1 to 4, and   m is more than n and 5 or less, and   a modifier or terminal T existing on a surface of the layer body,   wherein T is at least one selected from the group consisting of a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, or a hydrogen atom; and   a monovalent metal ion,   wherein   the conductive two-dimensional particle does not contain an amine,   a total content of chlorine and bromine in the conductive two-dimensional particle is 1,500 ppm by mass or less, and   an average value of a major diameter of a two-dimensional surface of the conductive two-dimensional particle is 1.0 μm to 20 μm.   
     
     
         2 . The conductive two-dimensional particle according to  claim 1 , wherein an average value of a thickness of the conductive two-dimensional particle is 1 nm to 10 nm. 
     
     
         3 . The conductive two-dimensional particle according to  claim 2 , wherein the monovalent metal ion is a lithium ion. 
     
     
         4 . The conductive two-dimensional particle according to  claim 1 , wherein the monovalent metal ion is a lithium ion. 
     
     
         5 . The conductive two-dimensional particle according to  claim 1 , further comprising an organic compound having a Hildebrand dissolution parameter of 19.0 MPa 1/2  to 47.8 MPa 1/2 . 
     
     
         6 . The conductive two-dimensional particle according to  claim 1 , wherein the monovalent metal ion is an alkali metal ion. 
     
     
         7 . The conductive two-dimensional particle according to  claim 1 , wherein a content of the monovalent metal ion in the conductive two-dimensional particles is 0.001 mass % to 10 mass %. 
     
     
         8 . The conductive two-dimensional particle according to  claim 1 , wherein the total content of the chlorine and the bromine in the conductive two-dimensional particle is 900 ppm by mass or less. 
     
     
         9 . A conductive paste comprising the conductive two-dimensional particle according to  claim 1 . 
     
     
         10 . A conductive composite material comprising:
 the conductive two-dimensional particle according to  claim 1 ; and   a resin.   
     
     
         11 . A method for producing a conductive two-dimensional particle, the method comprising:
 preparing a precursor represented by:
   M m AX n    
 wherein M is at least one metal of Group 3, 4, 5, 6, or 7, 
 X is a carbon atom, a nitrogen atom, or a combination thereof, 
 A is at least one metal of Group 12, 13, 14, 15, or 16, 
 n is 1 to 4, and 
 m is more than n and 5 or less; 
   etching the A atoms from the precursor and performing a first intercalation treatment of a monovalent metal ion using an etching solution containing a metal compound containing monovalent metal ions; and   performing a second intercalation treatment using an organic compound having a Hildebrand dissolution parameter of 19.0 MPa 1/2  to 47.8 MPa 1/2 .   
     
     
         12 . The method for producing a conductive two-dimensional particle according to  claim 11 , wherein the metal compound containing monovalent metal ions is a Li-containing compound. 
     
     
         13 . The method for producing a conductive two-dimensional particle according to  claim 11 , further comprising performing delamination treatment after the second intercalation treatment. 
     
     
         14 . A method for producing a conductive two-dimensional particle, the method comprising:
 preparing a precursor represented by:
   M m AX n    
 wherein M is at least one metal of Group 3, 4, 5, 6, or 7, 
 X is a carbon atom, a nitrogen atom, or a combination thereof, 
 A is at least one metal of Group 12, 13, 14, 15, or 16, 
 n is 1 to 4, and 
 m is more than n and 5 or less; 
   etching the A atoms from the precursor using an etching solution;   performing a first intercalation treatment of a monovalent metal ion using a metal compound containing monovalent metal ions; and   (d) performing a second intercalation treatment using an organic compound having a Hildebrand dissolution parameter of 19.0 MPa 1/2  to 47.8 MPa 1/2 .   
     
     
         15 . The method for producing a conductive two-dimensional particle according to  claim 14 , wherein the metal compound containing monovalent metal ions is a Li-containing compound. 
     
     
         16 . The method for producing a conductive two-dimensional particle according to  claim 14 , further comprising performing delamination treatment after the second intercalation treatment.