Showa Denko K.k.

Yuuichi Kamijou

Masataka Takeuchi

Takayuki Fukai

Yasuaki Wakizaka

Chiaki Sotowa

Akinori Sudoh

Masako Tanaka

Yoshiyuki Nishimura

Ryusuke Miura

Tomohiro Abe

A graphite material having pores which, when 200 rectangular regions of 6 &#x3bc;m&#xd7;8 &#x3bc;m are randomly selected in a surface image of the graphite material observed by a scanning electron microscope, in the surface of the graphite material appearing in the regions, a pore appearing on the surface and having an aperture in a shape having a diameter of 15 nm to 200 nm, a circularity degree of 0.75 to 1.0 and a major axis/minor axis ratio of 1.0 to 1.5 is visible in two regions or more. Also disclosed is a carbon material for battery electrodes, a paste for electrodes, an electrode and a lithium ion secondary battery including the graphite material.

Graphite material, carbon material for battery electrode, and battery

A method for producing a graphie material for an electrode material for lithium ion batteries, including a step for exothermically graphitizing a carbon material by directly passing an electric current therethrough. The carbon material has an compact powder resistivity of 0.4 &#x3a9;&#xb7;cm or less when compressed to a density of 1.4 g/cm, has an angle of repose in the range of 20&#xb0; to 50&#xb0; inclusive, and has a particle size (D90) in the volume-based particle size distribution measured using laser diffraction of 120 &#x3bc;m or less. The average surface interval (d002) of a surface (002) of the carbon material after graphitization, measured using x-ray diffraction, is in the range of 0.3354 nm-0.3450 nm inclusive.

Method for producing electrode material for lithium ion batteries

A method for producing a graphite material for lithium ion batteries, including a step for exothermically graphitizing a carbon material by directly applying an electric current therethrough. The carbon material is obtained by heating at a temperature in the range of 800&#xb0; C.-1500&#xb0; C. inclusive and subsequently pulverizing an organic carbon starting material, has a compact powder resistivity of 0.3 &#x3a9; cm or less when compressed to a density of 1.4 g/cm, has an angle of repose in the range of 20&#xb0; to 50&#xb0; inclusive, and has a particle size (D90) in the volume-based particle size distribution measured using laser diffraction of 120 &#x3bc;m or less. The average surface interval (d002) of a surface (002) of the carbon material after graphitization, measured using x-ray diffraction, is in the range of 0.3354 nm-0.3450 nm inclusive.

A graphite material suitable as an electrode material for non-aqueous electrolytic secondary batteries; a method for producing the same and a carbon material for battery electrodes; and a secondary battery. The graphite material includes crystallite graphite particles wherein an oxygen amount (a) (mass %) in a region from a particle surface of the graphite material to a depth of 40 nm is within a range of 0.010&#x2266;(a)&#x2266;0.04 as determined by a peak intensity of Oobtained by HAX-PES measurement using a hard X-ray of 7,940 eV.

Growing community of inventors

Tokyo, Japan

Yuuichi Kamijou