▎ 摘　　要

NOVELTY - Forming (M1) graphene oxide salt involves forming first precipitate by mixing graphite and oxidizer having alkali metal salt in solution, forming second precipitate by ionizing oxidizer having alkali metal salt with acid solution, and removing oxidizer from first precipitate, mixing second precipitate and water to form mixed solution, separating graphene oxide, applying ultrasonic waves to mixed solution to form dispersion liquid, mixing dispersion liquid, basic solution and organic solvent to form graphene oxide salt, and reacting graphene oxide included in dispersion liquid and base. USE - For forming graphene oxide salt, which is useful for forming grapheme (claimed), and in power storage device. The use of graphene oxide salt for a positive electrode or a negative electrode of a power storage device makes it possible to increase discharge capacity of the power storage device. The use of the graphene, instead of binder, for a positive electrode or a negative electrode can increase the reliability and durability of the power storage device. DETAILED DESCRIPTION - Forming (M1) graphene oxide salt involves either forming a first precipitate by mixing graphite and an oxidizer containing an alkali metal salt in a solution, forming a second precipitate by ionizing the oxidizer containing the alkali metal salt, which is included in the first precipitate, with an acid solution, and removing the oxidizer containing the alkali metal salt from the first precipitate, forming a mixed solution by mixing the second precipitate and water, separating graphene oxide from graphite oxide that is the graphite which is included in the second precipitate and oxidized by applying ultrasonic waves to the mixed solution or mechanically stirring the mixed solution, so that a dispersion liquid in which the graphene oxide is dispersed is formed, and forming graphene oxide salt by mixing the dispersion liquid, a basic solution, and an organic solvent and reacting the graphene oxide included in the dispersion liquid and a base included in the basic solution to each other; or forming a first mixed solution containing a first precipitate having graphite oxide and an oxidizer by mixing graphite and the oxidizer in a solution, forming a second precipitate containing the graphite oxide by collecting the first precipitate from the first mixed solution and then removing the oxidizer from the first precipitate with an acid solution, forming a second mixed solution in which graphene oxide is dispersed by mixing the second precipitate and water and then applying ultrasonic waves to a mixed solution or mechanically stirring the mixed solution, so that the graphene oxide is separated from the graphite oxide, and collecting graphene oxide salt by mixing a basic solution and an organic solvent with the second mixed solution and reacting the graphene oxide included in the second mixed solution and a base to each other to precipitate the graphene oxide salt; or forming a first precipitate by mixing graphite and an oxidizer containing an alkali metal salt in a solution, forming a second precipitate by ionizing the oxidizer containing the alkali metal salt, which is included in the first precipitate, with an acid solution, and removing the oxidizer containing the alkali metal salt from the first precipitate, forming a third precipitate containing graphite oxide salt by mixing the second precipitate and water, then mixing a basic solution and an organic solvent, and reacting graphite oxide that is formed by oxidizing the graphite, which is included in the second precipitate, and the basic solution, and forming graphene oxide by mixing the third precipitate and water and separating graphene oxide salt from the graphite oxide salt included in the third precipitate; or forming a first mixed solution containing a first precipitate having graphite oxide and an oxidizer by mixing graphite and the oxidizer in a solution, forming a second precipitate containing the graphite oxide by collecting the first precipitate from the first mixed solution and then removing the oxidizer from the first precipitate with an acid solution, forming a third precipitate containing graphite oxide salt by mixing the second precipitate and water, then mixing a basic solution and an organic solvent, and reacting the graphite oxide, which is included in the second precipitate, and a base, and forming a second mixed solution in which graphene oxide salt is dispersed by mixing the third precipitate and water, and then applying ultrasonic waves to a mixed solution or mechanically stirring the mixed solution, so that the graphene oxide salt is separated from the graphite oxide salt included in the third precipitate, and collecting the graphene oxide salt included in the second mixed solution. An INDEPENDENT CLAIM is included for forming graphene involving carrying out the method (M1); and then forming graphene by reducing the graphene oxide salt.