Abstract: An alkaline dry cell of the present invention includes: a positive electrode case having a nickel plating layer on its surface; a positive electrode provided in the positive electrode case; and a negative electrode provided in a hollow portion of the positive electrode with a separator interposed between the positive and negative electrodes. The positive electrode case has a nickel-cobalt alloy plating layer and a carbon material layer which extend over the nickel plating layer on an inner surface of the positive electrode case, and the carbon material layer is formed after annealing of the alloy plating layer. The alloy plating layer has a thickness ranging from 0.05 ?m to 0.4 ?m, and a mass ratio of cobalt relative to a total amount of nickel and cobalt contained in the alloy plating layer ranges from 37% to 57%.

Abstract: An alkaline battery including a negative electrode including zinc, a positive electrode including manganese dioxide, and an alkaline electrolyte, in which the positive electrode includes graphite particles each having a basal surface and an edge surface, and anatase titanium dioxide particles, and the anatase titanium dioxide particles have a mean particle size larger than a height of the edge surface of each graphite particle.

Abstract: An alkaline battery including a negative electrode including zinc, a positive electrode including manganese dioxide, and an alkaline electrolyte, in which the positive electrode includes graphite particles each having a basal surface and an edge surface, and anatase titanium dioxide particles, and the anatase titanium dioxide particles have a mean particle size larger than a height of the edge surface of each graphite particle.

Abstract: Provided is a cylindrical alkaline battery in which the packing density Dc of the manganese dioxide in the positive electrode is 2.8 to 3.0 g/cm3 and the packing density Da of zinc or a zinc alloy in the negative electrode is 2.0 to 2.3 g/cm3. The packing density Dc of the manganese dioxide, the packing density Da of the zinc or zinc alloy, the thickness Tc of the positive electrode in a radial direction, and the thickness Ta of the negative electrode in a radial direction satisfy one of the following relational formulas (1) to (3): ?1.975×(Tc/Ta)+2.745<Dc/Da<?1.690×(Tc/Ta)+2.734??(1) ?11.652×(Tc/Ta)2+14.470×(Tc/Ta)?3.095<Dc/Da<11.652×(Tc/Ta)2?18.420×(Tc/Ta)+8.585??(2) ?8.895×(Tc/Ta)2+12.864×(Tc/Ta)?3.258<Dc/Da<8.895×(Tc/Ta)2?16.244×(Tc/Ta)+8.726??(3).

Abstract: An alkaline dry battery of this invention includes: a cylindrical battery case with a bottom; a cylindrical positive electrode having a hollow, being in contact with an inner face of the battery case, and containing a manganese dioxide powder and a graphite powder; a negative electrode disposed in the hollow of the positive electrode; a separator interposed between the positive electrode and the negative electrode; and an alkaline electrolyte. The positive electrode has cracks therein, and the cracks are substantially arc-shaped in a cross-section perpendicular to the axial direction of the positive electrode and extend in the axial direction of the positive electrode. The positive electrode has a manganese dioxide density of 2.15 to 2.30 g/cm3.

Abstract: Provided is a cylindrical alkaline battery in which the packing density Dc of the manganese dioxide in the positive electrode is 2.8 to 3.0 g/cm3 and the packing density Da of zinc or a zinc alloy in the negative electrode is 2.0 to 2.3 g/cm3. The packing density Dc of the manganese dioxide, the packing density Da of the zinc or zinc alloy, the thickness Tc of the positive electrode in a radial direction, and the thickness Ta of the negative electrode in a radial direction satisfy one of the following relational formulas (1) to (3): ?1.975×(Tc/Ta)+2.745<Dc/Da<?1.690×(Tc/Ta)+2.734??(1) ?11.652×(Tc/Ta)2+14.470×(Tc/Ta)?3.095<Dc/Da<11.652×(Tc/Ta)2?18.420×(Tc/Ta)+8.585??(2) ?8.895×(Tc/Ta)2+12.864×(Tc/Ta)?3.258<Dc/Da<8.895×(Tc/Ta)2?16.244×(Tc/Ta)+8.

Abstract: An alkaline dry battery of this invention includes: a cylindrical battery case with a bottom; a cylindrical positive electrode having a hollow, being in contact with an inner face of the battery case, and containing a manganese dioxide powder and a graphite powder; a negative electrode disposed in the hollow of the positive electrode; a separator interposed between the positive electrode and the negative electrode; and an alkaline electrolyte. The positive electrode has cracks therein, and the cracks are substantially arc-shaped in a cross-section perpendicular to the axial direction of the positive electrode and extend in the axial direction of the positive electrode. The positive electrode has a manganese dioxide density of 2.15 to 2.30 g/cm3.

Abstract: An alkaline battery of the present invention includes a positive electrode material mixture including nickel oxyhydroxide. The nickel oxyhydroxide includes a secondary particle with a crystal structure mainly composed of ?-type at least a portion of the surface layer of the secondary particle, and with a crystal structure mainly composed of ?-type in the inner portion of the secondary particle. Based on the present invention, the advantage of the alkaline battery, i.e., excellence in discharge performance under high-load, can be kept and the conventional problem of storage characteristics can be improved.

Abstract: In order to provide an alkaline dry battery which enables to improve the operational stability of digital equipment by suppressing the progress of polarization during heavy load pulse discharge while maintaining the excellent heavy load discharge characteristics, and has an excellent reliability in terms of the leakage resistance and the safety under short-circuit conditions, the alkaline dry battery includes a positive electrode including a nickel oxyhydroxide powder and a manganese dioxide powder as positive electrode active materials, and including graphite as a conductive material; a negative electrode including zinc or a zinc alloy as a negative electrode active material; a separator interposed between the positive electrode and the negative electrode; a negative electrode current collector inserted in the negative electrode; an aqueous alkaline solution included in the separator; a battery case housing the positive electrode, the negative electrode, the separator, the negative electrode current collecto

Abstract: Provided is an alkaline dry battery allowing suppression of polarization in pulse discharge under heavy load to improve discharge characteristics, and having high reliability in safety in case of short circuit. In the positive electrode, a calcium compound having a content of iron element of 150 ppm or less is added in an amount of 0.1 to 10 mol % with respect to a positive electrode active material, a nickel oxyhydroxide powder having 2.95 or more of an average nickel valence and 8 to 18 ?m of an average particle diameter is used, the weight ratio of the nickel oxyhydroxide powder and a manganese dioxide powder is in the range of 20:80 to 90:10.

Abstract: In order to provide an alkaline dry battery having excellent heavy load discharge characteristics, suppressed polarization at the time of heavy load pulse discharge, and excellent heavy load discharge characteristics after high temperature storage, a nickel oxyhydroxide powder having a tap density of 2.1 to 2.7 g/cm3 and including non-spherical and sheet-like nickel oxyhydroxide particles is included in a positive electrode active material.

Abstract: An alkaline dry battery including nickel oxyhydroxide and manganese dioxide as positive electrode active materials. The nickel oxyhydroxide is a solid solution including at least manganese and cobalt. The content of the manganese is 5.2×10?2 to 7.5×10?2 moles per mole of the nickel oxyhydroxide, and the content of the cobalt is 0.5×10?2 to 2.0×10?2 moles. The alkaline dry battery maintains excellent heavy-load discharge characteristics, exhibits suppressed polarization during heavy-load pulse discharge to improve the operational stability of digital devices, and has high reliability with respect to leakage resistance and safety under short-circuit conditions.

Abstract: Abstract Provided is an alkaline dry battery allowing suppression of polarization in pulse discharge under heavy load to improve discharge characteristics, and having high reliability in safety in case of short circuit. In the positive electrode, a calcium compound having a content of iron element of 150 ppm or less is added in an amount of 0.1 to 10 mol % with respect to a positive electrode active material, a nickel oxyhydroxide powder having 2.95 or more of an average nickel valence and 8 to 18 ?m of an average particle diameter is used, the weight ratio of the nickel oxyhydroxide powder and a manganese dioxide powder is in the range of 20:80 to 90:10.

Abstract: To provide an alkaline dry battery that is excellent in discharge characteristics under a heavy load after storage at high temperature and suppresses polarization in pulse discharge under a heavy load, used is a nickel oxyhydroxide which is obtained by oxidizing a nickel hydroxide having a half width of a (101) face of 0.6 to 0.8 deg./2? and a half width of a (001) face of 0.5 to 0.7 deg./2? in powder X-ray diffraction, and which has an average nickel valence of 2.95 or more and an average particle diameter of 8 to 18 ?m.

Abstract: An alkaline battery of this invention includes a positive electrode containing manganese dioxide powder and nickel oxyhydroxide powder with a mean particle size of 8 to 18 ?m as positive electrode active materials and graphite powder with a mean particle size of 8 to 25 ?m as a conductive material. The positive electrode contains 5 to 9 parts by weight of the graphite powder per 100 parts by weight of the positive electrode active materials.

Abstract: An alkaline primary battery includes a positive electrode containing at least nickel oxyhydroxide as a positive electrode active material, a negative electrode containing zinc or a zinc alloy as a negative electrode active material, a separator arranged between the positive electrode and the negative electrode, and an alkaline electrolyte. The nickel oxyhydroxide contains at least manganese and calcium as elements forming solid solution or eutectic crystal with the nickel oxyhydroxide.

Abstract: An alkaline battery includes a positive electrode mixture, a negative electrode, and a separator interposed between the positive electrode mixture and the negative electrode. The positive electrode mixture contains a nickel oxyhydroxide, manganese dioxide and a conductive agent. (1) The nickel oxyhydroxide includes at least manganese dissolved therein, and the manganese accounts for 0.5 to 10% by mole of the total amount of metal elements contained in the nickel oxyhydroxide. (2) The nickel oxyhydroxide mainly has a ?-type crystal structure. (3) The nickel oxyhydroxide has a volume-basis mean particle size of 8 to 15 ?m. The use of this positive electrode mixture makes it possible to heighten the capacity of the alkaline battery and improve its storage characteristics. Also, the above-mentioned properties of the nickel oxyhydroxide including manganese enable a significant improvement in the productivity of the nickel oxyhydroxide.

Abstract: An alkaline battery of the present invention includes a positive electrode material mixture including nickel oxyhydroxide. The nickel oxyhydroxide includes a secondary particle with a crystal structure mainly composed of ?-type at at least a portion of the surface layer of the secondary particle, and with a crystal structure mainly composed of ?-type in the inner portion of the secondary particle. Based on the present invention, the advantage of the alkaline battery, i.e., excellence in discharge performance under high-load, can be kept and the conventional problem of storage characteristics can be improved.

Abstract: Disclosed is an alkaline battery including a positive electrode, a negative electrode and an alkaline electrolyte, (1) the positive electrode having a positive electrode material mixture containing electrolytic manganese doxide and nickel oxyhydroxide, (2) the nickel oxyhydroxide having a crystal in which at least Mg is dissolved, and (3) the nickel oxyhydroxide having a tap density determined after 500 taps of not less than 2 g/cm3, an average particle size based on volume of 8 to 20 ?m, and an average nickel valence of 2.95 to 3.05.

Abstract: An alkaline battery according to the present invention includes: a power generation element including a positive electrode, a negative electrode, a separator placed between the positive electrode and the negative electrode, and an electrolyte; a positive terminal portion electrically connected to the positive electrode; and a negative terminal portion electrically connected to the negative electrode. The positive electrode contains at least nickel oxyhydroxide powder as an active material. A PTC element is provided in a current path that does not come into contact with the electrolyte at least one of between the positive electrode and the positive terminal portion and between the negative electrode and the negative terminal portion.