Abstract: A positive electrode mixture layer for a lithium-ion secondary battery suitable for producing a lithium-ion secondary battery with high rate characteristics at an ordinary temperature and low temperatures and low internal resistance (DCR) at low temperatures, characterized by including a positive electrode active material, a binder, and a conductive additive, in which the conductive additive includes carbon black, a carbon nanotube (1) having an average fiber diameter of 80 to 400 nm, and a carbon nanotube (2) having an average fiber diameter of 0.4 to 3.0 nm, the content rates of the carbon black, the carbon nanotube (1), and the carbon nanotube (2) in the conductive additive are 40 to 80% by mass, 10 to 50% by mass, and 1 to 30% by mass, respectively, and the content rate of the conductive additive in the positive electrode mixed layer is 0.1 to 5.0% by mass.

Abstract: An object of the present invention is to provide a composite material usable as a negative electrode material of a lithium-ion secondary battery. A composite material of the present invention includes: a carbonaceous material; and a metal oxide layer coating a surface of the carbonaceous material, in which the metal oxide layer coats the surface of the carbonaceous material, forming a sea-island structure in which the metal oxide layer is scattered in islands, and a coating rate of the carbonaceous material with the metal oxide layer is 20% or more and 80% or less. A composite material of the present invention includes: a carbonaceous material; and a metal oxide layer and amorphous carbon layer coating the surface of the carbonaceous material, in which the metal oxide layer is scattered in islands on the surface of the carbonaceous material.

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: 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: 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: The invention provides a method of producing a cathode active material for a lithium secondary battery, whereby it is possible to configure a lithium secondary battery in which the discharge capacity is improved and elution of lithium ions from the lithium metal phosphate is suppressed when washing the lithium metal phosphate after the same was synthesized. The method of producing a cathode active material for a lithium secondary battery includes synthesizing a lithium metal phosphate represented by a composition formula LiMPO4, wherein the element M represents one or two or more of transition metals selected from among Fe, Mn, Co and Ni, and after the synthesis, washing the lithium metal phosphate with a washing liquid containing lithium ion.

Abstract: Provided is a method for producing a lithium metal phosphate, and the method comprises initiating and allowing to proceed, in the presence of a polar solvent, a conversion reaction of a lithium ion (Li+) source such as lithium hydroxide, a divalent transition metal ion (M2+) source such as a divalent transition metal sulfate, and a phosphate ion (PO43?) source such as phosphoric acid into a lithium metal phosphate at 150° C. or higher. The conversion reaction is initiated and allowed to proceed by bringing solution A containing one of a lithium ion, a divalent transition metal ion, and a phosphate ion into contact with solution B containing the others of these ions at 150° C. or higher, or by adjusting the pH of solution C that has a pH of lower than 4 and contains a lithium ion, a divalent transition metal ion, and a phosphate ion to 4 or higher.

Abstract: A cathode material for a lithium secondary battery, including fibrous carbon and a plurality of cathode active material particles bonded to a surface of the fibrous carbon. The cathode active material particles are composed of olivine-type LiMPO4 where M represents one or more kinds of elements selected from Fe, Mn, Ni, and Co. Also disclosed is a method of producing the cathode material and a lithium secondary battery.

Abstract: The present invention provides a method for producing a cathode-active material containing an olivine-type lithium metal phosphate for a lithium secondary battery which does not need washing or sintering after hydrothermal synthesis, the method including a step in which hydrothermal synthesis is carried out by using a mixture containing HMnPO4 and a lithium source as a raw material to produce an olivine-type lithium metal phosphate.

Abstract: A method is employed for producing a positive electrode active material for a lithium secondary battery that comprises mixing lithium phosphate having a particle diameter D90 of 100 ?m or less, an M element-containing compound having a particle diameter D90 of 100 ?m or less (where, M is one type or two or more types of elements selected from the group consisting of Mg, Ca, Fe, Mn, Ni, Co, Zn, Ge, Cu, Cr, Ti, Sr, Ba, Sc, Y, Al, Ga, In, Si, B and rare earth elements) and water, adjusting the concentration of the M element with respect to water to 4 moles/L or more to obtain a raw material, and producing olivine-type LiMPO4 by carrying out hydrothermal synthesis using the raw material.

Abstract: A method is employed for producing a positive electrode active material for a lithium secondary battery that comprises mixing lithium phosphate having a particle diameter D90 of 100 ?m or less, an M element-containing compound having a particle diameter D90 of 100 ?m or less (where, M is one type or two or more types of elements selected from the group consisting of Mg, Ca, Fe, Mn, Ni, Co, Zn, Ge, Cu, Cr, Ti, Sr, Ba, Sc, Y, Al, Ga, In, Si, B and rare earth elements) and water, adjusting the concentration of the M element with respect to water to 4 moles/L or more to obtain a raw material, and producing olivine-type LiMPO4 by carrying out hydrothermal synthesis using the raw material.

Abstract: A positive electrode active material for a lithium secondary battery having a core portion and a shell layer is employed in which the core portion is represented by Lix1M1y1Pz1O4 (where, M1 represents an element such as Mg, Ca, Fe or Mn, and the letters x1, y1 and z1 representing composition ratios are respectively such that 0<x1<2, 0<y1<1.5 and 0.9<z1<1.1), the shell layer is composed of one or more layers represented by Lix2M2y2Pz2O4 (where, M2 represents one type or two or more types of elements selected from the group consisting of Mg, Fe, Ni, Co and Al, and the letters x2, y2 and z2 representing composition ratios are respectively such that 0<x2<2, 0<y2<1.5 and 0.9<z2<1.1).

Abstract: A cathode material for a lithium secondary battery, including fibrous carbon and a plurality of cathode active material particles bonded to a surface of the fibrous carbon. The cathode active material particles are composed of olivine-type LiMPO4 where M represents one or more kinds of elements selected from Fe, Mn, Ni, and Co. Also disclosed is a method of producing the cathode material and a lithium secondary battery.

Abstract: The invention provides a method of producing a cathode active material for a lithium secondary battery, whereby it is possible to configure a lithium secondary battery in which the discharge capacity is improved and elution of lithium ions from the lithium metal phosphate is suppressed when washing the lithium metal phosphate after the same was synthesized. The method of producing a cathode active material for a lithium secondary battery includes synthesizing a lithium metal phosphate represented by a composition formula LiMPO4, wherein the element M represents one or two or more of transition metals selected from among Fe, Mn, Co and Ni, and after the synthesis, washing the lithium metal phosphate with a washing liquid containing lithium ion.

Abstract: The present invention provides a method for producing a cathode-active material containing an olivine-type lithium metal phosphate for a lithium secondary battery which does not need washing or sintering after hydrothermal synthesis, the method including a step in which hydrothermal synthesis is carried out by using a mixture containing HMnPO4 and a lithium source as a raw material to produce an olivine-type lithium metal phosphate.

Abstract: Provided is a method for producing a lithium metal phosphate, and the method comprises initiating and allowing to proceed, in the presence of a polar solvent, a conversion reaction of a lithium ion (Li+) source such as lithium hydroxide, a divalent transition metal ion (M2+) source such as a divalent transition metal sulfate, and a phosphate ion (PO43?) source such as phosphoric acid into a lithium metal phosphate at 150° C. or higher. The conversion reaction is initiated and allowed to proceed by bringing solution A containing one of a lithium ion, a divalent transition metal ion, and a phosphate ion into contact with solution B containing the others of these ions at 150° C. or higher, or by adjusting the pH of solution C that has a pH of lower than 4 and contains a lithium ion, a divalent transition metal ion, and a phosphate ion to 4 or higher.