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: It is an object of the invention to provide an electrolytic solution for alkaline batteries which inhibits hydrogen gas evolution and thereby prevents battery leakage and an alkaline battery containing the electrolytic solution. The electrolytic solution for alkaline batteries is characterized by containing aluminum at an ion concentration of 5 to 200 ppm.

Abstract: A hydrogen storage material which is characterized by having, as a cast alloy, a flaky or similar shape with a thickness of 50 to 500 &mgr;m and showing such crystallite orientation that the X-ray diffraction pattern has an intensity ratio of plane indices (002)/(200) of 2 to 10 as measured with the cooled surface of the flaky cast alloy being in parallel with a mount, and a process of producing the same.

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 zinc alloy powder for an alkaline manganese dioxide cell, in which the average concentration of an iron component in the zinc alloy powder is 5 ppm or less, the average concentration of the iron component within a near-surface portion of the zinc alloy powder is 10 ppm or less, and the total content of the iron component in impurities present at the near-surface portion of the zinc alloy powder is 0.5 ppm or less based on the whole body of the particles, can easily suppress abnormal generation of gas at a low cost.

Abstract: A hydrogen storage material which is characterized by having, as a cast alloy, a flaky or similar shape with a thickness of 50 to 500 &mgr;m and showing such crystallite orientation that the X-ray diffraction pattern has an intensity ratio of plane indices (002)/(200) of 2 to 10 as measured with the cooled surface of the flaky cast alloy being in parallel with a mount, and a process of producing the same.