Sekisui Chemical Co., Ltd.

Niigata University

Oita University

Takuya Wada

Shunji Ohara

Akira Nakasuga

Naoki Sasagawa

Norio Tsubokawa

Hiroki Masuda

Shoji Nozato

Akihiko Fujiwara

Masahiro Toyoda

Hiroshi Yoshitani

Yuuki Sawada

Shouji Nozato

Provided is a carbon material that is large in specific surface area, and moreover, capable of easily forming an electrode film even when any binder is substantially not contained. Provided is a carbon material that has a BET specific surface area of 100 m/g or more, with the weight of the carbon material remaining on a sieve after shaking being 90% by weight or more with respect to 100% by weight of the carbon material put in the sieve, when 0.2 g of the carbon material packed in a cylindrical syringe of 2 cm in diameter is compressed at a pressure of 16 kN, the whole of the compressed carbon material is taken out from the syringe and put in the sieve with an aperture of 4.75 mm, and the sieve is shaken for 1 minute.

Carbon material and method for producing same, electrode material for electrical storage device, and electrical storage device

There is provided an electrode material for electricity storage devices, which enables suppression of heat generation in charge and discharge at large currents. The electrode material for electricity storage devices comprises a first carbon material having a graphite structure wherein graphite is partially exfoliated, and a second carbon material different from the first carbon material, wherein the ratio A/B, where A represents a weight of the first carbon material and B represents a weight of the second carbon material, is within the range of 0.01 or higher and 100 or lower.

Electrode material for electricity storage devices, electrode for electricity storage devices, and electricity storage device

Provided is a carbonaceous material capable of enhancing the initial charge and discharge efficiency and the cycle characteristics of lithium ion secondary batteries. The carbonaceous material is used as an electrode material for a lithium ion secondary battery and has a volume resistivity of 0.7 &#x3a9;&#xb7;cm or less as measured at a pressure of 13 MPa in the form of a mixture of 5 wt % of the carbonaceous material and 95 wt % of lithium cobaltate.

Carbon material, carbon material-active material composite, electrode material for lithium-ion secondary battery, and lithium-ion secondary battery

The present invention provides a method for producing a random-structure GIC in which exfoliated graphite having a low regularity of a graphene stacked state and a small number of stacked graphene layers can be easily obtained by exfoliation treatment. The method includes the steps of providing an alkali metal-GIC having an alkali metal intercalated between graphene layers and bringing a polar protic solvent into contact with the alkali metal-GIC in a non-oxidizing atmosphere.

Method for producing random-structure GIC, method for producing exfoliated graphite dispersion liquid, exfoliated graphite dispersion liquid, and exfoliated graphite

Provided is a production method which can attain exfoliating treatment of graphite and a process of grafting a polymer onto exfoliated graphite simultaneously and thus makes it possible to easily obtain an exfoliated graphite-polymer composite material in a short time. A method for producing an exfoliated graphite-polymer composite material includes a step of mixing graphite or primary exfoliated graphite, a depolymerizable monomer of which the polymer is decomposed by heating to generate radicals and also to form a monomer or an oligomer, or the polymer A of the monomer, or a polymer B which forms radicals at a temperature close to its decomposition temperature to obtain a mixture; and a heating step of putting the mixture in a non-open container to heat the mixture to a first temperature range from the ceiling temperature or higher to the onset decomposition temperature or lower, or to a temperature higher than the first temperature range.

Method for producing exfoliated graphite-polymer composite material

Providing a modified-graphene-like carbon material into which hydroxyl groups are introduced. By reacting a graphene-like carbon material with hydrogen peroxide, a hydroxyl group is introduced into the graphene-like carbon material.

Method for producing modified-graphene-like carbon material, modified-graphene-like carbon material, and resin composite material containing modified-graphene-like carbon material

Provided are a functional-group-modified carbon material modified with an isocyanate group or amino group, and a method for producing the material. The material is an isocyanate-group-modified carbon material in which an isocyanate group of a diisocyanate compound is bonded to a graphene-like carbon material, or an amino-group-modified carbon material in which a fragment obtained by radical-decomposing an amino-group-containing azo-type radical initiator is added to the graphene-like carbon material by radical-trapping. The method is a method for producing a functional-group-modified carbon material, including heating and stirring, in a solvent, a graphene-like carbon material, and a diisocyanate compound or an amino-group-containing azo-type radical initiator.

Growing community of inventors

Osaka, Japan

Takuya Wada