Abstract: A positive electrode active material for a lithium battery is provided which offers high-temperature storage property and battery properties and comprises manganese dioxide having a crystal structure that exhibits an X-ray diffraction pattern in which peaks having a peak intensity ratio of not less than 0.05 with respect to the peak at 2?=37.3°±0.5° are present at positions of 2?=18.2°±0.5°, 19.5°±0.5°, 28.6°±0.5°, 56.6°±0.5°, 59.1°±0.5°, and 65.1°±0.5°, or further at 2?=22.0°±1.0°, the X-ray diffraction pattern being obtained using a powder X-ray diffraction device (XRD) that uses CuK?1 rays.

Abstract: A positive electrode active material for a lithium battery is provided which offers high-temperature storage property and battery properties and comprises manganese dioxide having a crystal structure that exhibits an X-ray diffraction pattern in which peaks having a peak intensity ratio of not less than 0.05 with respect to the peak at 2?=37.3°±0.5° are present at positions of 2?=18.2°±0.5°, 19.5°±0.5°, 28.6°±0.5°, 56.6°±0.5°, 59.1°±0.5°, and 65.1°±0.5°, or further at 2?=22.0°±1.0°, the X-ray diffraction pattern being obtained using a powder X-ray diffraction device (XRD) that uses CuK?1 rays.

Abstract: A positive electrode active material for a battery, consisting essentially of manganese dioxide, contains 5 to 400 ppm of magnesium or 0.001 to 3.0% by weight of titanium, thereby achieving even higher performance of a battery, such as enhanced pulse characteristics.

Abstract: A positive electrode active material for battery consisting of electrolytic manganese dioxide and a battery wherein this positive electrode active material is used, this electrolytic manganese dioxide being such that, when it is heated and the weight loss thereof is measured, the weight loss at 200° C. to 400° C. is not less than 2.7 wt %. The amount of weight lost in this temperature range is proportional to the quantity of bound waters inside the electrolytic manganese dioxide.

Abstract: The present invention provides a battery cathode active material formed of electrolytic manganese dioxide which has a large specific area and a high electric potential and can enhance battery characteristics such as high-rate characteristics and high-rate pulse characteristics when used as a battery cathode active material. The invention also provides a method for producing electrolytic manganese dioxide and a battery employing the cathode active material. The battery cathode active material is formed of electrolytic manganese dioxide containing a sulfate group in an amount of 1.3 to 1.6 wt. %.

Abstract: A process for producing a lithium manganate for lithium secondary batteries comprising mixing a manganese compound and a lithium compound, firing the mixture at 1000 to 1500.degree. C., mixing the resulting complex oxide with a lithium compound, and firing the mixture at 600 to 800.degree. C.

Abstract: A method of manufacturing manganese dioxide containing 0.05 to 2.0 parts by weight of phosphorus which consists of introducing a manganese sulfate solution and sulfuric acid as an electrolyte into an electrolytic cell, adding to said electrolyte at least one member selected from the group consisting of phosphoric acid, phosphorous acid, hypophosphorous acid and compounds thereof and carrying out the electrolysis at a bath temperature of 92.degree. to 100.degree. C. whereby manganese dioxide containing phosphorus is electrodeposited on the cathode.