Nippon Oil Corporation

Nippon Petroleum Refining Company, Limited

Jx Nippon Oil Energy Corporation

Jxtg Nippon Oil & Energy Corporation

Power Carbon Technology Co., Ltd.

Masaki Fujii

Hideki Ono

Takashi Oyama

Tamotsu Tano

Ippei Fujinaga

Kiwamu Takeshita

Keizo Ikai

Shinya Taguchi

Kazuhisa Nakanishi

Hiromitsu Hashisaka

Keizou Ikai

Keiji Higashi

Akio Sakamoto

Noriyuki Kiuchi

Toshitaka Fujii

Takashi Noro

Takashi Suzuki

Takashi Maeda

Hiroshi Kato

Tsutomu Nakamura

Hiroshi Kawachi

Masatoshi Nishida

Kunihiko Satou

Kazuhiro Igarashi

Yutaka Sanokawa

The present invention relates to an artificial graphite material for a negative electrode of a lithium ion secondary battery which shows smaller deteriorations of the capacity of charging and discharging cycles and which has a reduced internal resistance and a high output characteristic. It is an artificial graphite material for a lithium ion secondary battery negative electrode, wherein the size L(112) of a crystallite in the c-axis direction is 5 to 25 nm; the ratio (ID/IG) of the intensities of peaks is 0.05 to 0.2; and the relative absorption intensity ratio (I4.8 K/I280 K) is 5.0 to 12.0.

Artificial graphite material for negative electrode of lithium ion secondary battery, and method for producing same

There are disclosed activated carbon for use in an electric double-layer capacitor electrode, the carbon being capable of improving rate characteristics and float characteristics of the electric double-layer capacitor electrode, and a method for manufacturing the activated carbon. The method for manufacturing the activated carbon for use in the electric double-layer capacitor electrode, comprising the steps of: grinding a carbon raw material to adjust an average particle diameter of the carbon raw material into a range of 1 &#x3bc;m to 15 &#x3bc;m; mixing the carbon raw material whose average particle diameter has been adjusted, with an alkali activator to obtain a mixture; and an activation treatment comprising heating the mixture under an atmosphere of an inert gas and then under an atmosphere of a mixed gas of the inert gas and water vapor.

Activated carbon for an electric double-layer capacitor electrode and manufacturing method for same

The present invention provides a method for producing an activated carbon for an electric double layer capacitor, with which the wettability of a carbon material with an alkali activator is improved, thereby improving contact efficiency between the carbon material and the alkali activator and efficiently promoting reaction between the carbon material, which is a starting material and the activator. The method comprises adjusting a carbon material as it is or after having been calcined to produce a carbon powder having an average particle diameter of 0.5 to 15 &#x3bc;m, oxidizing the carbon powder to contain 3 percent by mass or more of oxygen, and activating the oxidized product with an alkali activator.

Activated carbon for electric double layer capacitor electrode and method for producing the activated carbon

Provided is a method for producing an activated carbon for an electric double layer capacitor electrode comprising adjusting a carbon material (including a calcined product of a carbon material) in particle size, followed by mixing the carbon material with an alkali activator, and then activating the mixture, wherein the mixing is carried out so that the particle size distribution composed of particles with a size of 300 &#x3bc;m or greater in the mixture of the carbon material and alkali activator is 5 percent or less so that the mixing state of the carbon material and alkali activator can be improved, resulting in a reduction in the ratio of the alkali activator.

The present invention provides a process for producing an activated carbon having a small average particle diameter, a uniform particle size and a relatively large specific surface area suitable for an electric double layer capacitor electrode, in an easy and cost effective manner. The process comprises calcining an easily graphitizable carbon material such as petroleum coke or coal coke, used as the raw material under an oxidizing gas atmosphere, adjusting the particle size of the carbon material, and then activating the carbon material. The use of the activated carbon produced by the process of the present invention in an electrode can provide an electric double layer capacitor having a large capacitance per unit volume.

Carbon material for electric double layer capacitor and process for producing the carbon material

The present invention provides a process of producing an activated carbon for an electric double layer capacitor, which can produce easily and inexpensively an activated carbon free from fusing of carbon particles during activation and having a small diameter, a uniform particle diameter, and a relatively large specific surface area on a commercial scale. The process comprises the steps of calcining an easily graphitizable carbon material so that the reduction rates of the hydrogen/carbon atomic ratio (H/C) and the volatile components in the carbon material are 4 percent or more and 5 percent or more, respectively after calcination and activating the carbon material thereby producing an activated carbon for an electric double layer capacitor, having an average particle diameter of 0.5 to 7 &#x3bc;m and a BET specific surface area of 1500 to 3000 m/g.

Process of producing activated carbon for electric double layer capacitor electrode

The present invention provides a raw coke having such a structure that the graphitized product resulting from graphitization of the raw coke at a temperature of 2800&#xb0; C. under an inactive gas atmosphere will have ratios of the crystallite size to the lattice constant of 360 or less in the (002) plane and 1500 or less in the (110) plane, as a raw coke providing active carbon produced by alkali-activating the raw coke, which is reduced in remaining alkali content and can simplify washing operation because washing liquid can easily pass through the activated carbon, or as a raw coke for the production of needle coke.

Raw coke for electricity storage carbon material and needle coke

The present invention provides a raw oil composition for manufacturing a carbon material for electric double layer capacitor electrodes, characterized in that the raw oil composition comprises 25 wt % or more of a saturated component and 16 wt % or less of an asphaltene component among the saturated component, an aromatic component, a resin component, and the asphaltene component obtained by developing of the raw oil composition by thin-layer chromatography; the raw oil composition has an average molecular weight of 960 or less; and the raw oil composition has an aromatic-carbon-fraction (fa) of 0.22 to 0.72. Use of the raw oil composition provides a carbon material for electric double layer capacitor electrodes that can exhibit high capacitance with high reproducibility without manufacturing synthetic pitch.

Raw oil composition for carbon material for electric double layer capacitor electrode

The present invention provides feedstock compositions for use of the production of an activated carbon for electric double layer capacitor electrodes or the production of needle coke, comprising a first heavy oil with an initial boiling point of 300&#xb0; C. or higher, an asphalten content of 12 percent by mass or less, a saturate content of 50 percent by mass or more and a sulfur content of 0.3 percent by mass or less, produced as a residue resulting from vacuum-distillation of a petroleum-based oil and a second heavy oil with an initial boiling point of 150&#xb0; C. or higher and a sulfur content of 0.5 percent by mass or less, produced by subjecting a hydrocarbon oil to fluidized catalytic cracking.

Feedstock composition and raw coke for electricity storage carbon material and needle coke

Growing community of inventors

Kawasaki, Japan

Masaki Fujii