Toda Kogyo Corporation

Jx Nippon Oil Energy Corporation

Mazda Motor Corporation

Toda Kyogo Corp.

Katsuaki Kurata

Tomoaki Urai

Takashi Oyama

Tamotsu Tano

Seiji Okazaki

Ippei Fujinaga

Wataru Oda

Toshiyuki Oda

Noriyo Ishimaru

Toshiaki Hiramoto

Akino Sato

Takashi Suzuki

Tomohiro Honda

Akihide Takami

Hideharu Iwakuni

This disclosure concerns graphite materials having lattice distortion for lithium-ion secondary battery negative electrode obtained by a manufacturing method comprising the steps of: pulverizing and classifying a raw coke composition obtained from a heavy-oil composition undergone coking by delayed coking process, the raw coke composition having a H/C atomic ratio that is a ratio of hydrogen atoms H and carbon atoms C of 0.30 to 0.50 and having a micro-strength of 7 to 17 mass % to obtain powder of the raw coke composition; giving compressive stress and shear stress to the powder of the raw coke composition so that average circularity is 0.91 to 0.97 to obtain round powder; heating the round powder to obtain a carbonized composition; and graphitizing the carbonized composition.

Graphite material with lattice distortion for use in lithium-ion secondary battery negative electrodes, and lithium-ion secondary battery

A method for producing an amorphous carbon material for a negative electrode of a lithium-ion secondary battery includes the steps of; pulverizing and classifying a raw coke composition obtained from a heavy-oil composition undergone coking by delayed coking process to obtain powder of the raw coke composition, the raw coke composition having a H/C atomic ratio that is a ratio of hydrogen atoms H and carbon atoms C of 0.30 to 0.50 and having a micro-strength of 7 to 17 mass %; giving compressive stress and shear stress to the powder of the raw coke composition to obtain a carbonized composition precursor; and heating the carbonized composition precursor under an inert atmosphere at a temperature from 900&#xb0; C. to 1,500&#xb0; C. so that a size of a crystallite Lc(002) is in a range of 2 nm to 8 nm, the size being calculated from a (002) diffraction line obtained by X-ray wide-angle diffractometry.

Method of producing amorphous carbon material for the negative electrode of lithium ION secondary battery, and lithium ION secondary battery

A graphite material for a negative electrode is provided which can suppress capacity degradation due to repeated charging and discharging cycles, storage in a charged state, and floating charging. A method of manufacturing a graphite material for a negative electrode of a lithium ion secondary battery is provided in which an atomic ratio H/C of hydrogen atoms H and carbon atoms C in the raw coke composition is in a range of 0.30 to 0.50 and a microstrength of the raw coke composition is in a range of 7 wt % to 17 wt %.

Graphite material for negative electrodes of lithium ion secondary battery, manufacturing method for said material, and lithium ion secondary battery using same

Disclosed is an exhaust gas purifying catalyst, which comprises a CeZr-based composite oxide capable of maintaining a hollow structure to ensure an oxygen absorbing/releasing capability, even after being exposed to high-temperature exhaust gas. The exhaust gas purifying catalyst comprises a honeycomb-shaped substrate, and a catalyst layer formed on a surface of the substrate. The catalyst layer contains a composite oxide which includes cerium (Ce) and zirconium (Zr) and has a hollow structure, and a catalytic metal supported by the composite oxide. The composite oxide having the hollow structure includes, in a state after being subjected to a thermal aging in Air at 1000&#xb0; C. for 24 hours, a particle with a shape having an outer diameter of 750 to 1000 nm and a shell thickness of 80 to 120 nm.

Exhaust gas purifying catalyst

The present invention relates to a nanostructural substance constituted from primary particles having a particle diameter of not more than 30 nm. In the nanostructural substance of the present invention, the primary particles have a small particle diameter, and a contact surface between the primary particles is small. In particular, since the nanostructural substance of the present invention has a large content of molecules existing at the surface thereof and, therefore, a high surface energy as compared to simple agglomerated particles, it is expected to more remarkably exhibit functions of the compound constituting the primary particles. In addition, titanium oxide particles constituted from the nanostructural substance comprising primary particles having a small particle diameter and a small contact area therebetween according to the present invention exhibit a high catalytic activity and can be suitably used, in particular, as a photocatalyst.

Nanostructural substance

Growing community of inventors

Hiroshima, Japan

Katsuaki Kurata