Toray Industries, Inc.

Koichiro Manabe

Eiichiro Tamaki

Manabu Kawasaki

The purpose of the present invention is to provide a graphene which has high dispersibility, high electrical conductivity and oxidation resistance namely a graphene which has high electrochemical stability. In order to achieve the above-described purpose, a surface-treated graphene according to the present invention is obtained by having a compound represented by general formula (1) or a neutralized salt thereof adhere to a graphene. In general formula (1), A represents a benzene-based aromatic group with a condensation number of 1-4, which has no phenolic hydroxy group; Rrepresents a direct bond, a divalent hydrocarbon group having 1-12 carbon atoms, or a divalent organic group having 1-12 carbon atoms, which has a structure selected from the group consisting of an ether bond, an ester bond, an alcohol structure and a carbonyl structure; each of Rand Rindependently represents a hydrogen atom, a hydrocarbon group having 1-12 carbon atoms, or an organic group having 1-12 carbon atoms, which has a structure selected from the group consisting of an ether bond, an ester bond, an alcohol structure and a carbonyl structure; and n represents an integer of 1-6. 

Surface-treated graphene, surface-treated graphene/organic solvent dispersion liquid, surface-treated graphene/electrode active material composite particles and electrode paste

A graphene material in a specific form is provided that has a high dispersibility and can maintain a high electric conductivity and ion conductivity when used as material for electrode manufacturing. A graphene dispersion liquid is provided including graphene dispersed in a solvent having a N-methyl pyrolidone content of 50 mass % or more and, when diluted with N-methylpyrolidone to a graphene weight fraction of 0.000013, giving a diluted solution having a weight-based absorptivity coefficient, which is calculated by Equation (1) given below, of 25,000 cm&#x2212;1 or more and 200,000 cm&#x2212;1 or less at a wavelength of 270 nm:weight-based absorptivity coefficient (cm)=absorbance/{0.000013&#xd7;cell's optical path length (cm)}.&#x2003;&#x2003;(1)

Graphene dispersion, process for producing same, process for producing particles of graphene/active material composite, and process for producing electrode paste

Growing community of inventors

Otsu, Japan

Koichiro Manabe