Abstract: A negative electrode active material for a secondary battery including an artificial flake graphite A and an artificial lump graphite B and having a ratio D50(A)/D50(B) of 50% particle diameter D50(A) of the artificial flake graphite A in a volume-based particle size distribution to 50% particle diameter D50(B) of the artificial lump graphite B in a volume-based particle size distribution is more than 0.6 and less than 1.0. The artificial flake graphite A has a surface roughness R of not less than 2.8 and not more than 5.1, the artificial lump graphite B has a surface roughness R of not less than 6.0 and not more than 9.0, and a ratio B/(A+B) of a mass of the artificial lump graphite B to the total mass of the artificial flake graphite A and the artificial lump graphite B is not less than 0.03 and not more than 0.30.

Abstract: A scale-like graphite and carbon material for a battery electrode which is suitable for use as an electrode material for an aqueous-electrolyte secondary battery, wherein the ratio IG/ID (G value) between the peak area (ID) in a range of 1300 to 1400 cm?1 and the peak area (IG) in a range of 1580 to 1620 cm?1 by Raman spectroscopy spectra, in which an edge surface of the particle of the scale-like graphite is measured with by a Raman microspectrometer, is 5.2 to 100 and the average interplanar spacing d002 of plane (d002) by the X-ray diffraction method is 0.337 nm or less and optical structures of the scale-like graphite have a specific shape; the method for producing the same; a carbon material for a battery electrode and a paste for an electrode containing the material; and a secondary battery having excellent charge/discharge cycle characteristics and high current load characteristics.

Abstract: A graphite powder, preferably including scale-like particles, which satisfies the following formulae (1) and (2), wherein e(0.5) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 0.5 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution; and e(3) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 3 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution: e(3)(%)?e(0.5)(%)?1,??formula (1): e(3)(%)>85.??formula (2): Also disclosed is a method of producing the graphite powder; a graphite material for a battery electrode; an electrode for a lithium ion; and a lithium-ion secondary battery.

Abstract: The present provides a carbon material containing 50 to 1,000 ppm by mass of vanadium (V), wherein a mean particle diameter D50 is 3 to 7 ?m; a tapping density after 400 times of tapping is 0.40 to 1.00 g/cm3; a BET specific surface area is 4.0 to 12.0 m2/g; an R value (ID/IG) measured in the spectrum observed by Raman spectroscopy is 0.10 to 0.30; and an interplanar spacing d002 of plane (002) (nm) and Lc002 (nm) as being the size in the c-axis direction of the graphite crystals satisfy the relationship represented by the following formulae (1) and (2) 0.3362?d002?0.3370??(1) ?23660×d002+8010?Lc002??23660×d002+8025??(2); which is suitable for a non-aqueous electrolytic secondary battery having a low resistance and a high coulomb efficiency; a method for producing the same; a carbon material for a battery electrode; an electrode; and a lithium-ion secondary battery using the above-described carbon material.

Abstract: Composite graphite particles, including a core material composed of artificial graphite and a coating material for coating the core material. The coating material includes a non-powdery amorphous carbon material and a powdery conductive carbon material. The ratio of the mass of the non-powdery amorphous carbon material to the mass of the core material is 0.2 to 3.8 mass %, and the ratio of the mass of the powdery conductive carbon material to the mass of the core material is 0.3 to 5.0 mass %. Also disclosed is a method for producing the composite graphite particles, a paste containing the composite graphite particles, an electrode sheet including a laminate of a current collector and an electrode layer containing the composite graphite particles, and a lithium ion secondary battery including the electrode sheet as a negative electrode.

Abstract: A method for producing a graphite powder for a negative electrode of a lithium ion secondary battery, including a process of graphitizing a mixture of a carbon raw material powder and a silicon carbide powder, wherein a 90% particle diameter in a volume-based cumulative particle size distribution by laser diffraction method, D90, is 1 to 40 ?m, a silicon carbide content in a total mass of a carbon raw material and silicon carbide (mass of silicon carbide/total mass of the carbon raw material and silicon carbide) is 1 to 35 mass %, the ratio of a 50% particle diameter in a volume-based cumulative particle size distribution by laser diffraction method, D50, of the carbon raw material powder to D50 of silicon carbide powder (D50 of the carbon raw material powder/D50 of silicon carbide powder) is 0.40 to 4.0.

Abstract: A carbon material and a material for a battery electrode which is suitable for use as an electrode material for an aqueous-electrolyte secondary battery, which material includes optical structures having a specific shape, and in which material the ratio IG/ID (R value) between the peak intensity (ID) of a peak in a range of 1300 to 1400 cm?1 and the peak intensity (IG) of a peak in a range of 1580 to 1620 cm?1 measured by Raman spectroscopy spectra when particles of the carbon material are measured with Raman microspectrometer is 0.38 or more and 1.2 or less and the average interplanar spacing d002 of plane (002) by the X-ray diffraction method is 0.335 nm or more and 0.338 nm or less; and a secondary battery excellent in charge/discharge cycle characteristics and large current load characteristics.

Abstract: A non-flaky carbon material having specific optical structures, wherein the ratio between the peak intensity I110 of (110) plane and the peak intensity I004 of (004) plane of a graphite crystal determined by the powder XRD measurement, I110/I004, is 0.10 or more and 0.35 or less; an average circularity is 0.80 or more and 0.95 or less; d002 is 0.337 nm or less; and the total pore volume of pores having a diameter of 0.4 ?m or less measured by the nitrogen gas adsorption method is 25.0 ?l/g or more and 40.0 ?l/g or less. Also disclosed is a method for producing the carbon material, a carbon material for a battery electrode, a paste for an electrode incorporating the carbon material for a battery electrode, an electrode for a lithium battery incorporating a formed body of the paste for an electrode, a lithium-ion secondary battery including the electrode and a method for producing the electrode.

Abstract: A graphite material, including high crystallinity graphite and spherical graphite, in which high crystallinity graphite: (1) a rhombohedral crystal ratio by X-ray diffractometry is 0.02 or less, (2) Lc is 90 nm or more, (3) when a pressure of 1 GPa for 10 seconds is applied to the high crystallinity graphite, the increment rate of the BET specific surface area after applying the pressure to the BET specific surface area before applying the pressure is 90% or less, and (4) D10 is 5.0 ?m or more; and in which spherical graphite: (1) a median of the circularity is 0.90 or more, and (2) a tapping density is 1.20 g/cm3 or more; and the ratio by mass of the high crystallinity graphite and the spherical graphite is 95:5 to 40:60; an electrode using the graphite material as an electrode active material; and a lithium ion secondary battery using the electrode.

Abstract: A carbon material and a material for a battery electrode which is suitable for use as an electrode material for an aqueous-electrolyte secondary battery, which material includes optical structures having a specific shape, and in which material the ratio IG/ID (R value) between the peak intensity (ID) of a peak in a range of 1300 to 1400 cm?1 and the peak intensity (IG) of a peak in a range of 1580 to 1620 cm?1 measured by Raman spectroscopy spectra when particles of the carbon material are measured with Raman microspectrometer is 0.38 or more and 1.2 or less and the average interplanar spacing d002 of plane (002) by the X-ray diffraction method is 0.335 nm or more and 0.338 nm or less; and a secondary battery excellent in charge/discharge cycle characteristics and large current load characteristics.

Abstract: The present invention provides a carbon material and a material for a battery electrode which is suitable for use as an electrode material for an aqueous-electrolyte secondary battery, which material comprises optical structures having a specific shape, and in which material the ratio IG/ID (R value) between the peak intensity (ID) of a peak in a range of 1300 to 1400 cm?1 and the peak intensity (IG) of a peak in a range of 1580 to 1620 cm?1 measured by Raman spectroscopy spectra when particles of the carbon material are measured with Raman microspectrometer is 0.38 or more and 1.2 or less and the average interplanar spacing d002 of plane (002) by the X-ray diffraction method is 0.335 nm or more and 0.338 nm or less; and a secondary battery excellent in charge/discharge cycle characteristics and large current load characteristics.

Abstract: A graphite powder, preferably including scale-like particles, which satisfies the following formulae (1) and (2), wherein e(0.5) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 0.5 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution; and e(3) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 3 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution: e(3)(%)?e(0.5)(%)?1,??formula (1): e(3)(%)>85.??formula (2): Also disclosed is a method of producing the graphite powder; a graphite material for a battery electrode; an electrode for a lithium ion; and a lithium-ion secondary battery.

Abstract: A graphite powder, preferably including scale-like particles, which satisfies the following formulae (1) and (2), wherein e(0.5) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 0.5 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution; and e(3) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 3 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution: e(3)(%)?e(0.5)(%)?1,??formula (1): e(3)(%)>85.??formula (2): Also disclosed is a method of producing the graphite powder; a graphite material for a battery electrode; an electrode for a lithium ion; and a lithium-ion secondary battery.

Abstract: A carbon material for negative electrodes in lithium ion secondary battery, wherein a specific surface area is not less than 1.5 m2/g and not more than 6.5 m2/g, a tap density is not less than 0.5 g/cm3 and not more than 1.3 g/cm3, a Raman R value is not less than 0.1 and not more than 0.4, no diffraction peak is present in a range of diffraction angle of 42.7° to 43.7° in X-ray diffraction analysis, d002 is not more than 0.337 nm, and at most one peak is present in a range of not less than 500° C. and less than 1000° C. in thermogravimetric-differential thermal analysis.

Abstract: The present invention relates to a method for producing a graphite-containing carbon powder for a negative electrode of a lithium ion secondary battery having a high undersize yield and a high tapping density, which does not need pulverization treatment after heat treatment. The method comprises a process of forming a carbon coating on the surface of the carbide particles to obtain a carbon-coated raw material; a process of mixing the carbon-coated raw material and a carbon material to obtain a mixed raw material; and a heat treatment process of heating the mixed raw material to 2,000° C. or more to thermally decompose the carbide. Using the graphite-containing carbon powder according to the method of the present invention makes it possible to efficiently obtain a carbon material for a battery electrode, an electrode comprising the carbon material, and a secondary battery having the electrode.

Abstract: A method for producing a fuel cell electrode catalyst, including a step (I) of bringing an aqueous solution of a transition metal compound (1) into contact with ammonia and/or ammonia water to generate a precipitate (A) containing an atom of the transition metal, a step (II) of mixing at least the precipitate (A), an organic compound (B), and a liquid medium (C) to obtain a catalyst precursor liquid, and a step (IV) of subjecting the solid in the catalyst precursor liquid to heat treatment at a temperature of 500 to 1200° C. to obtain an electrode catalyst; a portion or the entirety of the transition metal compound (1) being a compound containing a transition metal element of group 4 or group 5 of the periodic table; and the organic compound (B) being at least one selected from sugars and the like.

Abstract: A graphite powder, preferably including scale-like particles, which satisfies the following formulae (1) and (2), wherein e(0.5) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 0.5 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution; and e(3) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 3 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution: e(3)(%)?e(0.5)(%)?1,??formula (1): e(3)(%)>85.??formula (2): Also disclosed is a method of producing the graphite powder; a graphite material for a battery electrode; an electrode for a lithium ion; and a lithium-ion secondary battery.

Abstract: A method for producing a graphite powder for a negative electrode of a lithium ion secondary battery, including a process of graphitizing a mixture of a carbon raw material powder and a silicon carbide powder, wherein a 90% particle diameter in a volume-based cumulative particle size distribution by laser diffraction method, D90, is 1 to 40 ?m, a silicon carbide content in a total mass of a carbon raw material and silicon carbide (mass of silicon carbide/total mass of the carbon raw material and silicon carbide) is 1 to 35 mass %, the ratio of a 50% particle diameter in a volume-based cumulative particle size distribution by laser diffraction method, D50, of the carbon raw material powder to D50 of silicon carbide powder (D50 of the carbon raw material powder/D50 of silicon carbide powder) is 0.40 to 4.0.

Abstract: The present provides a carbon material containing 50 to 1,000 ppm by mass of vanadium (V), wherein a mean particle diameter D50 is 3 to 7 ?m; a tapping density after 400 times of tapping is 0.40 to 1.00 g/cm3; a BET specific surface area is 4.0 to 12.0 m2/g; an R value (ID/IG) measured in the spectrum observed by Raman spectroscopy is 0.10 to 0.30; and an interplanar spacing d002 of plane (002) (nm) and Lc002 (nm) as being the size in the c-axis direction of the graphite crystals satisfy the relationship represented by the following formulae (1) and (2) 0.3362?d002?0.3370 ??(1) ?23660×d002+8010?Lc002??23660×d002+8025 ??(2); which is suitable for a non-aqueous electrolytic secondary battery having a low resistance and a high coulomb efficiency; a method for producing the same; a carbon material for a battery electrode; an electrode; and a lithium-ion secondary battery using the above-described carbon material.

Abstract: A method for manufacturing a graphite powder for a negative electrode material for a lithium-ion secondary battery, which includes a process of pulverizing a graphite precursor, and subjecting a mixture of the pulverized graphite precursor and an alkaline compound to graphitization treatment by heating the mixture at 2,800 to 3,500° C. Also disclosed is a graphite powder obtained by the manufacturing method, a negative electrode for a lithium-ion secondary battery containing the graphite powder and a lithium-ion battery provided with the negative electrode.