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  Enclosed nickel-zinc primary battery, its anode and production methods for themRelated Patent Categories: Coating Processes, Electrical Product Produced, Metal CoatingThe Patent Description & Claims data below is from USPTO Patent Application 20070243320. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] This invention relates to a enclosed nickel-zinc primary battery, anode thereof and their production methods. BACKGROUND ART [0002] Enclosed alkali primary batteries are used as power sources of portable type electronic devices such as portable radio sets or cassette recorders, for example. [0003] A typical material of anodes of alkali batteries is manganese dioxide. [0004] Recent development of various portable electronic devices is remarkable, and more and more devices need a heavy loading property. Therefore, there is a demand for a battery more excellent in high-efficiency discharge property than alkaline-manganese batteries that have been used most typically heretofore. [0005] Conventionally known batteries include those having a spiral structure made by winding sheet-like anode, cathode and separator and injecting an electrolytic solution, and those having an inside-out structure in which a cylindrical anode, gel cathode and cylindrical separator are contained in a cylindrical metal can. [0006] Inside-out batteries are more excellent in productivity and can provide a higher capacity at a lower cost than spiral type batteries. However, because of a small opposed area of the positive and cathodes, inside-out batteries are inferior in high-efficiency discharge property. [0007] On the other hand, there is also known another battery excellent in high-efficiency discharge property, which is a nickel-zinc battery using a nickel oxide as the anode, zinc as the cathode and alkali salt solution as the electrolytic solution (U.K. Patent 365125). [0008] In addition to that, this battery has a lot of advantages including (1) a high battery voltage, (2) flatness of the discharge curve and (3) high utility factor under high-rate discharge. [0009] That battery, however, has not yet been brought into practical use. [0010] A reason thereof is that the problems of a short lifetime caused by generation of dendrite of zinc pole in charge-discharge cycles and changes in shape have not been solved sufficiently. [0011] There is also known an inside-out type nickel-zinc secondary battery using nickel hydroxide as the anode active material and zinc as the cathode active material (Japanese Patent Laid-Open Publication 2000-67910). [0012] This battery, however, involves the problem that oxygen gas is generated from the anode while the charge-discharge cycle is repeated, the internal pressure of the battery rises, and the electrolytic solution may leak. [0013] Furthermore, the theoretical capacity ratio of the positive and cathodes of this battery is 1:2. This is a remedy for preventing deterioration of the battery characteristics, such as preventing generation of a gas, and it results in leaving a large quantity of the cathode active material not used for the discharge and making it difficult to accomplish a high capacitance. [0014] Regarding nickel-zinc primary batteries, there are almost no reports on their development. [0015] It is therefore the first object of the invention to provide a enclosed nickel-zinc primary battery maintaining the excellent characteristics of the conventional nickel-zinc battery, having a high capacity and excellent in ratio of maintaining the capacity during its storage. [0016] The second object of the invention is to provide an inside-out type nickel-zinc primary battery excellent in high-efficiency discharge property. [0017] The third object of the invention is to provide a enclosed nickel-zinc primary battery having a high energy density per unit weight. [0018] The fourth object of the invention is to provide a method of production the enclosed nickel-zinc primary battery. [0019] The fifth object of the invention is to provide a anode used in the enclosed nickel-zinc primary battery and its production method. DISCLOSURE OF INVENTION [0020] The invention provides different versions of enclosed nickel-zinc primary batteries, anodes used therein, and production methods of those batteries and their anodes. [0021] Enclosed nickel-zinc primary batteries according to the invention uses a specific nickel hydroxide as its anode active material to form a structure suitable for primary batteries, and thereby ensures the aforementioned excellent characteristics. Continue reading... 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