Abstract: Provided is a lithium secondary battery including a positive electrode layer composed of a cobalt-containing lithium complex oxide sintered body, a negative electrode layer composed of a titanium-containing sintered body, a ceramic separator interposed between the positive electrode layer and the negative electrode layer and containing MgO, an electrolytic solution with which the positive electrode layer, the negative electrode layer, and the ceramic separator are impregnated, and an exterior body including a closed space, the closed space accommodating the positive electrode layer, the negative electrode layer, the ceramic separator, and the electrolytic solution, wherein the positive electrode layer, the ceramic separator, and the negative electrode layer are bonded together, and the interface between the negative electrode layer and the ceramic separator has a larger roughness than the interface between the positive electrode layer and the ceramic separator.

Abstract: Provided is a lithium secondary battery including a sintered body, the sintered body including a laminate portion which includes a positive electrode layer, a negative electrode layer, and a separator, and in which the positive electrode layer and the negative electrode layer are laminated through the separator. The sintered body includes an insulating ceramic portion covering at least a part of a peripheral end of the laminate portion and extending across at least a part of a laminate structure exposed at the peripheral end of the laminate portion.

Abstract: Provided is a lithium secondary battery including a sintered body, the sintered body including a laminate portion which includes a plurality of positive electrode layers, a plurality of negative electrode layers, and a separator, and in which the plurality of positive electrode layers and the plurality of negative electrode layers are alternately laminated through the separator. The sintered body includes a positive electrode connection portion connected to at least two or more of the plurality of positive electrode layers included in the laminate portion, the positive electrode connection portion containing 70 vol % or more and 100 vol % or less of a positive electrode active material for forming the plurality of positive electrode layers.

Abstract: A lithium secondary battery including a plurality of positive electrode layers, negative electrode layers, and separators, and in which the positive electrode layers and the negative electrode layers are alternately laminated through the separators. The laminate includes a first insulating layer contacting a first end portion of each of the positive electrode layers in a width direction thereof, and a second insulating layer contacting a second end portion of each of the negative electrode layers in a width direction thereof on a side opposite to the first end portion in the width direction. When an external width of the laminate is represented by W, and an average of widths of the first insulating layers and widths of the second insulating layers is represented by wave, a ratio “(wave/W)×100” falls within a range of from 0.8 (%) to 40 (%).

Abstract: A lithium secondary battery including a laminate that is a sintered body of positive electrode layers, negative electrode layers, and separators, and in which the positive electrode layers and the negative electrode layers are alternately laminated through the separators. The laminate includes a first insulating layer contacting a first end portion of each of the positive electrode layers in a width direction thereof, and a second insulating layer contacting a second end portion of each of the negative electrode layers in a width direction thereof on a side opposite to the first end portion in the width direction. When an external thickness of the laminate is represented by T, and an average of thicknesses of the first insulating layers and thicknesses of the second insulating layers is represented by tave, (tave/T)×100?30 (%) is satisfied.

Abstract: A lithium secondary battery includes a positive electrode composed of a sintered body containing lithium cobaltate, a negative electrode, and a separator composed of a sintered body containing magnesia interposed between the positive electrode and the negative electrode. The lithium secondary battery further includes an intermediate layer between the positive electrode and the separator, the intermediate layer containing an oxide containing Co and Mg.

Abstract: Provided is a lithium ion secondary battery including (a) a unit cell including a positive electrode layer composed of a lithium complex oxide sintered body, a negative electrode layer composed of a titanium-containing sintered body, a ceramic separator interposed therebetween, and an electrolyte, (b) a current collecting layer on each of both sides or the surface on the negative electrode layer side of the unit cell, and (c) an exterior body including a closed space, which accommodates the unit cell. The positive electrode layer, the ceramic separator, the negative electrode layer, and the current collecting layer form one integrated sintered body as a whole, whereby these components are bonded together, and in cross-sectional observation of the interface between the current collecting layer and the negative electrode layer, the proportion of the region in which these layers are in direct contact at the interface is 45 to 90%.

Abstract: A lithium composite oxide sintered body plate includes a porous structure in which a plurality of primary particles of a lithium composite oxide having a layered rock-salt structure are bonded is included, in which a porosity is 15 to 50%, a ratio of the primary particles whose average inclination angle being an average value of angles between a (003) plane of the plurality of primary particles and a plate surface of the sintered body plate is more than 0° and 30° or less is 60% or more, one or more additive elements selected from Nb, Ti, W are contained, and an addition amount of the one or more additive elements to an entire of the sintered body plate is 0.01 wt % or more and 2.0 wt % or less.

Abstract: Provided is a lithium secondary battery including a positive electrode layer composed of a cobalt-containing lithium composite oxide sintered body, a negative electrode layer composed of a titanium-containing sintered body, a ceramic separator interposed between the positive electrode layer and the negative electrode layer, an electrolyte impregnating at least the ceramic separator, and an exterior body having a closed space and accommodating the positive electrode layer, the negative electrode layer, the ceramic separator, and the electrolyte within the closed space. The positive electrode layer, the ceramic separator, and the negative electrode layer are bonded together. The lithium composite oxide sintered body contains, as an auxiliary agent, 0.05 to 2.0 mol % of boron with respect to the content of cobalt in the lithium composite oxide sintered body or 0.05 to 1.2 mol % of strontium with respect to the aforementioned cobalt content.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery includes secondary particles of a lithium transition metal complex oxide as a main component. The main component is represented by a formula: Lit(Ni1-xCox)1-yMnyB?P?S?O2, where t, x, y, ?, ?, and ? satisfy inequalities of 0?x?1, 0.00?y?0.50, (1?x)·(1?y)?y, 0.000???0.020, 0.000??=0.030, 0.000???0.030, and 1+3?+3?+2??t?1.30, and satisfy at least one of inequalities of 0.002??, 0.006??, and 0.004??. The secondary particles exhibit a pore distribution, where a pore volume Vp(1) having a pore diameter of not less than 0.01 ?m and not more than 0.15 ?m satisfies an inequality of 0.035 cm3/g?Vp(1) and where a pore volume Vp(2) having a pore diameter of not less than 0.01 ?m and not more than 10 ?m satisfies an inequality of Vp(2)?0.450 cm3/g.

Abstract: Provided is a lithium secondary battery including a positive electrode layer composed of a cobalt-containing lithium complex oxide sintered body, a negative electrode layer composed of a titanium-containing sintered body, a ceramic separator interposed between the positive electrode layer and the negative electrode layer and containing MgO, an electrolytic solution with which the positive electrode layer, the negative electrode layer, and the ceramic separator are impregnated, and an exterior body including a closed space, the closed space accommodating the positive electrode layer, the negative electrode layer, the ceramic separator, and the electrolytic solution, wherein the positive electrode layer, the ceramic separator, and the negative electrode layer are bonded together, and the interface between the negative electrode layer and the ceramic separator has a larger roughness than the interface between the positive electrode layer and the ceramic separator.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery includes secondary particles of a lithium transition metal complex oxide as a main component. The main component is represented by a formula: Lit(Ni1-xCox)1-yMnyB?P?S?O2, where t, x, y, ?, ?, and ? satisfy inequalities of 0?x?1, 0.00?y?0.50, (1?x)·(1?y)?y, 0.000???0.020, 0.000??=0.030, 0.000???0.030, and 1+3?+3?+2??t?1.30, and satisfy at least one of inequalities of 0.002??, 0.006??, and 0.004??. The secondary particles exhibit a pore distribution, where a pore volume Vp(1) having a pore diameter of not less than 0.01 ?m and not more than 0.15 ?m satisfies an inequality of 0.035 cm3/g?Vp(1) and where a pore volume Vp(2) having a pore diameter of not less than 0.01 ?m and not more than 10 ?m satisfies an inequality of Vp(2)?0.450 cm3/g.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery includes secondary particles of a lithium transition metal complex oxide as a main component. The main component is represented by a formula: Lit(Ni1-xCox)1-yMnyB?P?S?O2, where t, x, y, ?, ?, and ? satisfy inequalities of 0?x?1, 0.00?y?0.50, (1?x)·(1?y)?y, 0.000???0.020, 0.000???0.030, 0.000???0.030, and 1+3?+3?+2??t?1.30, and satisfy at least one of inequalities of 0.002??, 0.006??, and 0.004??. The secondary particles exhibit a pore distribution, where a pore volume Vp(1) having a pore diameter of not less than 0.01 ?m and not more than 0.15 ?m satisfies an inequality of 0.035 cm3/g?Vp(1) and where a pore volume Vp(2) having a pore diameter of not less than 0.01 ?m and not more than 10 ?m satisfies an inequality of Vp(2)?0.450 cm3/g.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery includes secondary particles of a lithium transition metal complex oxide as a main component. The main component is represented by a formula: Lit (Ni1-xCox)1-yMnyB?P?S?O2, where t, x, y, ?, ?, and ? satisfy inequalities of 0?x?1, 0.00?y?0.50, (1?x)·(1?y)?y, 0.000???0.020, 0.000???0.030, 0.000???0.030, and 1+3?+3?+2??t?1.30, and satisfy at least one of inequalities of 0.002??, 0.006??, and 0.004??. The secondary particles exhibit a pore distribution, where a pore volume Vp(1) having a pore diameter of not less than 0.01 ?m and not more than 0.15 ?m satisfies an inequality of 0.035 cm3/g?Vp(1) and where a pore volume Vp(2) having a pore diameter of not less than 0.01 ?m and not more than 10 ?m satisfies an inequality of Vp(2)?0.450 cm3/g.

Abstract: A recording disk cartridge includes a plurality of flexible recording disk media, a rotational member, and a cartridge case. The rotational member holds the recording disk media so that the recording disk media simultaneously rotate. The cartridge case provides a rotationally free housing for the recording disk media and the rotational member. The cartridge case has an opening to allow an end portion of the rotational member to be exposed to an outside of the cartridge case. The recording disk cartridge has an elastic member which provides a force to thrust the rotational member toward the opening.

Abstract: A disk cartridge capable of smoothly opening/closing a head opening without enlarging a second shutter. In a disk cartridge, a disc-shaped disk medium is rotatably housed in a disk housing portion of a case, and a head opening through which a head of a drive device accesses a recording face is formed in the bottom plate of the case. The head opening is closed when an end of a first shutter, which is rotatable coaxially with the disk medium and an end of a second shutter swingable around an axis different from that of the first shutter come into contact with each other. Each of the contact ends of the first and second shutters includes an arc portion having the axis of turn of the second shutter as a center.

Abstract: Disclosed is a recording disk cartridge which improves its assembly and production capacities, as well as the flexibility of the design. The recording disk cartridge that has a cartridge case including flexible recording disk media in an integrally rotatable fashion, a lower plate forming a lower wall of the cartridge case, the lower wall being placed parallel to the recording disk media, one or more inner plates being fixed on the lower plate with being stacked and partitioning the recording disk media, and an upper plate being fixed on the inner plates and forming an upper wall of the cartridge case. Furthermore, the lower plate incorporates at least one of a shutter lock mechanism and a write protect switch mechanism. The shutter lock mechanism blocks a shutter from being opened, and the write protect switch mechanism prevents data from being erased accidentally from the recording disk media.

Abstract: A recording disk cartridge includes a plurality of flexible recording disk media integrally rotatably housed within a cartridge case. Each of the recording disk media is fixed to a center core which is stacked one on another through a spacer. The cartridge case includes: a lower plate for configuring a lower wall parallel to the plurality of the recording disk media; at least one inner plate that is stacked and fixed on the lower plate, and partitions the plurality of the recording disk media; and an upper plate that is stacked and fixed on the inner plate, and configures an upper wall of the cartridge case. Each spacer is provided with locking protrusions at upper and lower surfaces thereof, and each center core is provided with locking holes for engagement with the locking protrusions of adjacent spacers.

Abstract: An optical disk is provided with a disk substrate having a recording layer formed on one surface of a substrate and a cover sheet applied over the recording layer; and a display sheet which is affixed to a surface of the disk substrate opposite to a surface covered with the cover sheet and which has substantially the same physical characteristic as that of the cover sheet. The display sheet and the cover sheet are substantially brought into coincidence with each other in terms a direction of heat contraction and a heat contraction rate.

Abstract: A recording disk cartridge includes a plurality of flexible recording disk media integrally rotatably housed within a cartridge case including: a lower plate for configuring a lower wall; at least one inner plate partitioning the recording disk media; and an upper plate for configuring an upper wall, wherein the cartridge further comprises a center core provided for each recording disk medium, having a main body portion and a collar part widening in an outer diameter direction from the main body portion; each recording disk medium is affixed to the collar part of the respective center core; and each inner plate has a central opening configured to accommodate the main body portion of the center core and has a recess part along a lower rim of the central opening for preventing interference with the collar part of the center core disposed on a layer immediately below.