Abstract: An all-solid-state secondary battery includes a laminate which includes a plurality of positive electrode layers each having a positive electrode active material layer, a plurality of negative electrode layers each having a negative electrode active material layer, and a plurality of solid electrolyte layers each containing a solid electrolyte, and in which the positive electrode layers and the negative electrode layers are alternately laminated with the solid electrolyte layers interposed therebetween, and the plurality of solid electrolyte layers include an outermost solid electrolyte layer disposed on both end sides of the laminate in a lamination direction and being thinnest among the plurality of solid electrolyte layers, and an inner solid electrolyte layer disposed inward relative to the outermost solid electrolyte layer and being thicker than the outermost solid electrolyte layer.

Abstract: An all-solid-state secondary battery includes a laminate which includes a plurality of positive electrode layers each having a positive electrode active material layer, a plurality of negative electrode layers each having a negative electrode active material layer, and a plurality of solid electrolyte layers each containing a solid electrolyte, and wherein the positive and negative electrode layers are alternately laminated with the solid electrolyte layers interposed therebetween, wherein the plurality of solid electrolyte layers includes a first and a second outer solid electrolyte layer disposed on both end portion sides of the laminate in a lamination direction, and an inner solid electrolyte layer disposed between the first and second outer solid electrolyte layers, and both the first and second outer solid electrolyte layers are a thick-film outer solid electrolyte layer having a thickness more than that of the inner solid electrolyte layer.

Abstract: A negative electrode includes a current collector and a negative electrode active material layer that is provided on the current collector and includes a negative electrode active material. The negative electrode active material includes a carbon material, and a surface of the negative electrode active material layer has a spectral reflectance Ra in a range of 7.0?Ra?10.8% at a wavelength of 550 nm.

Abstract: The lithium ion secondary battery wherein at least one positive electrode layer including a positive electrode active material layer and at least one negative electrode layer including a negative electrode active material layer are laminated in sequence with at least one solid electrolyte layer interposed therebetween, wherein a ratio t1/t2 of an average thickness t1 of the thickest solid electrolyte layer to an average thickness t2 of the thinnest solid electrolyte layer satisfies 1.02 ? t1/t2 ? 1.99 when an average thickness of each of the solid electrolyte layer is defined as t.

Abstract: An electrode and a lithium ion secondary battery having excellent cycle characteristics in a high temperature environment are provided. An electrode includes: an active material layer including an active material, a conductive assistant, and a binder, wherein the active material contains active material particles containing a lithium transition metal oxide as a main component, and the active material particles each include a core part having a space group of R-3m and a covering part having a space group of Fm-3m configured to cover at least part of an outer circumferential portion of the core part.

Abstract: A positive electrode includes a positive electrode current collector, and a positive electrode active material layer that is provided on the positive electrode current collector and that includes a positive electrode active material, a conductive auxiliary agent, and a binder. A surface of the positive electrode active material layer has a reflectance Rc in a range of 2.0?Rc?12.0% at a wavelength of 550 nm. A lithium ion secondary battery includes: the positive electrode; a negative electrode including a negative electrode current collector and a negative electrode active material layer that is provided on the negative electrode current collector and that includes a negative electrode active material; a separator; and a nonaqueous electrolyte solution. A surface of the negative electrode active material layer has a reflectance Ra in a range of 7.5?Ra?16.0% at a wavelength of 550 nm.

Abstract: An electrode and a lithium ion secondary battery having excellent cycle characteristics in a high temperature environment are provided. An electrode includes: an active material layer including an active material, a conductive assistant, and a binder, wherein the active material contains active material particles containing a lithium transition metal oxide as a main component, and the active material particles each include a core part having a space group of R-3m and a covering part having a space group of Fm-3m configured to cover at least part of an outer circumferential portion of the core part.

Abstract: A negative electrode includes a current collector and a negative electrode active material layer that is provided on the current collector and includes a negative electrode active material. The negative electrode active material includes a carbon material, and a surface of the negative electrode active material layer has a spectral reflectance Ra in a range of 7.0?Ra?10.8% at a wavelength of 550 nm.

Abstract: A negative electrode includes a negative electrode current collector and a negative electrode active material layer that is provided on the negative electrode current collector and includes a negative electrode active material. The negative electrode active material includes a carbon material, and a surface of the negative electrode active material layer has a reflectance Ra in a range of 7.0?Ra?14.8% at a wavelength of 550 nm. A lithium ion secondary battery includes the negative electrode, a positive electrode, a separator, and a nonaqueous electrolyte solution. The nonaqueous electrolyte solution includes a nonaqueous solvent and an electrolyte, the nonaqueous solvent contains ethylene carbonate, and the ethylene carbonate is contained in a range of 10 to 30 vol. % in the entire nonaqueous solvent.

Abstract: A method for manufacturing an active material, capable of improving the discharge capacity of a lithium ion secondary battery is provided. The method for manufacturing an active material according to the present invention includes a first step of heating a mixture solution including a lithium source, a phosphate source, a vanadium source, and water under pressure to generate a precursor in the mixture solution, and adjusting the pH of the mixture solution including the precursor to be 6 to 8; and a second step of heating the precursor at 425 to 650° C. after the first step to generate an active material.

Abstract: A positive electrode includes a positive electrode current collector, and a positive electrode active material layer that is provided on the positive electrode current collector and that includes a positive electrode active material, a conductive auxiliary agent, and a binder. A surface of the positive electrode active material layer has a reflectance Rc in a range of 2.0?Rc?12.0% at a wavelength of 550 nm. A lithium ion secondary battery includes: the positive electrode; a negative electrode including a negative electrode current collector and a negative electrode active material layer that is provided on the negative electrode current collector and that includes a negative electrode active material; a separator; and a nonaqueous electrolyte solution. A surface of the negative electrode active material layer has a reflectance Ra in a range of 7.5?Ra?16.0% at a wavelength of 550 nm.

Abstract: A negative electrode includes a negative electrode current collector and a negative electrode active material layer that is provided on the negative electrode current collector and includes a negative electrode active material. The negative electrode active material includes a carbon material, and a surface of the negative electrode active material layer has a reflectance Ra in a range of 7.0?Ra?14.8% at a wavelength of 550 nm. A lithium ion secondary battery includes the negative electrode, a positive electrode, a separator, and a nonaqueous electrolyte solution. The nonaqueous electrolyte solution includes a nonaqueous solvent and an electrolyte, the nonaqueous solvent contains ethylene carbonate, and the ethylene carbonate is contained in a range of 10 to 30 vol. % in the entire nonaqueous solvent.

Abstract: A lithium ion secondary battery includes: a positive electrode including a positive electrode active material layer; a negative electrode; and an electrolyte. The positive electrode active material layer contains Lia(M)b(PO4)c (M=VO or V, 0.9?a?3.3, 0.9?b?2.2, 0.9?c?3.3) as a first positive electrode active material, and additionally contains a fluorine compound of 1 to 300 ppm in terms of fluorine with respect to a weight of the positive electrode active material layer.

Abstract: The present invention provides an active material which can increase the discharge capacity of a lithium-ion secondary battery as compared with the case using conventional LiMnPO4 as a positive electrode active material. The active material in accordance with the present invention contains a crystallite of LiMnPO4, the crystallite having a size of 20 to 93 nm in a direction perpendicular to a (060) plane thereof.

Abstract: An active material capable of improving the discharge capacity of a lithium ion secondary battery is provided. The active material of the present invention includes LiVOPO4 and one or more metal elements selected from the group consisting of Al, Nb, Ag, Mg, Mn, Fe, Zr, Na, K, B, Cr, Co, Ni, Cu, Zn, Si, Be, Ti, and Mo.

Abstract: The lithium-ion secondary battery includes a positive electrode containing an active material made of a compound including lithium and a transition metal; an electrolyte containing 5 to 30 ppm of hydrofluoric acid; and a negative electrode containing 1 to 100 ppm of vanadium.

Abstract: The present invention provides an active material which can increase the discharge capacity of a lithium-ion secondary battery as compared with the case using conventional LiMnPO4 as a positive electrode active material. The active material in accordance with the present invention contains a crystallite of LiMnPO4, the crystallite having a size of 20 to 93 nm in a direction perpendicular to a (060) plane thereof.

Abstract: A lithium ion secondary battery includes: a positive electrode including a positive electrode active material layer; a negative electrode; and an electrolyte. The positive electrode active material layer contains Lia(M)b(PO4)c (M=VO or V, 0.9?a?3.3, 0.9?b?2.2, 0.9?c?3.3) as a first positive electrode active material, and additionally contains a fluorine compound of 1 to 300 ppm in terms of fluorine with respect to a weight of the positive electrode active material layer.

Abstract: A nonaqueous electrolyte for a lithium-ion secondary battery containing 0.1 ppm to 20 ppm of vanadium in terms of vanadium ions, and containing cyclic carbonate and chain carbonate is used.

Abstract: An active material that can achieve sufficient discharge capacity at high discharging rate, an electrode including the active material, and a lithium ion secondary battery including the electrode, and a method for manufacturing the active material are provided. The active material includes a LiVOPO4 powder, a first carbon powder, and a second carbon powder. A relational expression of 0.05?A1/A2?0.5 is satisfied, where A1 represents the ratio of the G band peak height observed around 1580 cm?1 in Raman spectrum of the first carbon powder to the 2D band peak height observed around 2700 cm?1 in the Raman spectrum of the first carbon powder, and A2 represents the ratio of the G band peak height observed around 1580 cm?1 in Raman spectrum of the second carbon powder to the 2D band peak height observed around 2700 cm?1 in the Raman spectrum of the second carbon powder.