BORON-DOPED CARBON MATERIAL, CONDUCTIVE COMPOSITION, CONDUCTIVE FILM, AND ELECTRIC STORAGE DEVICE
The objective of the present invention is to provide a carbon material excellent in conductivity. The carbon material according to the present invention has a graphene sheet as a basic skeleton and is doped with boron so that carbon is substituted with boron, the carbon material being characterized in that the boron content in the carbon material is 0.005-15 mol %, and when the content of dopant boron that substitutes carbon on the surface of the carbon material is denoted by X (mol %) and the content of boron in the carbon material is denoted by Y (mol %), X/Y<0.8 is satisfied.
1 . A carbon material having a carbon hexagonal network plane as a basic skeleton and doped with boron to replace carbon,
wherein a content of boron in the carbon material is 0.005 to 15 mol %, and when a content of boron doped to replace carbon on the surface of the carbon material determined by using X-ray photoelectron spectroscopy (XPS) is X (mol %) and a content of boron in the carbon material determined by using ICP optical emission spectrometry is Y (mol %), X/Y<0.8 is satisfied.
2 . The carbon material according to claim 1 ,
wherein the carbon material contains at least one selected from a group consisting of graphite, graphene nanoplatelets, graphene, and carbon nanotubes.
3 . The carbon material according to claim 1 ,
wherein 0.01<X/Y<0.4 is satisfied.
4 . A conductive composition comprising:
the carbon material according to claim 1 ; and
at least one of a binder resin and a solvent.
5 . The conductive composition according to claim 4 ,
wherein the carbon material contains two or more different carbon materials.
6 . The conductive composition according to claim 4 , further comprising a conductivity aid.
7 . The conductive composition according to claim 4 , further comprising an active material,
wherein the conductive composition is used as a mixture ink for forming a positive electrode or negative electrode for an electric storage device.
8 . A conductive film formed from the conductive composition according to claim 4 .
9 . An electric storage device comprising an electrode having a mixture layer formed from the conductive composition according to claim 7 .
10 . The carbon material according to claim 1 ,
wherein a peak intensity ratio (G/D ratio) of a G band and a D band of a carbon material is 1.7 or more.
11 . The carbon material according to claim 1 ,
wherein an average particle size of the carbon material is 0.5 to 100 μm.
12 . The carbon material according to claim 1 ,
wherein an average thickness of the carbon material is 150 nm to 50 μm.
13 . A conductive composition comprising:
the carbon material according to claim 2 ; and
at least one of a binder resin and a solvent.
14 . A conductive composition comprising:
the carbon material according to claim 10 ; and
at least one of a binder resin and a solvent.
15 . A conductive composition comprising:
the carbon material according to claim 12 ; and
at least one of a binder resin and a solvent.
16 . The conductive composition according to claim 5 , further comprising a conductivity aid.
17 . The conductive composition according to claim 6 , further comprising an active material,
wherein the conductive composition is used as a mixture ink for forming a positive electrode or negative electrode for an electric storage device.
18 . A conductive film formed from the conductive composition according to claim 5 .
19 . A conductive film formed from the conductive composition according to claim 6 .
20 . A conductive film formed from the conductive composition according to claim 7 .