摘要:
A process for manufacture of manganese dioxide comprising subjecting an aqueous bath comprising manganese sulfate (MnSO4) and sulfuric acid (H2SO4) to electrolysis in a closed cell wherein the electrolysis bath is maintained at an elevated temperature above 110° C., preferably above 115° C. and at superatmospheric pressure. Desirably the bath can be maintained at an elevated temperature between about 115° C. and 155° C. The electrolysis is carried out preferably at elevated current density of between about 12.5 and 37 Amp/sq. ft (135 and 400 Amp/sq. meter) which allows for smaller or fewer electrolysis units. An MnO2 product having a specific surface area (SSA) within desired range of between 18-45 m2/g can be obtained. A doping agent, preferably a soluble titanium dopant is employed to help obtain the desired specific surface area (SSA) of the MnO2 product. The manganese dioxide product in zinc/MnO2 alkaline cells gives excellent service life, particularly in high power application.
摘要:
An electrochemical cell containing a decomposing electrolyte solvent, further contains small amounts of an additive material such as lithium sulfide which causes partial self discharge of the cathode of the cell with non-reactive products. The self discharge partially deactivates substantially all of the active cathode surface as a reaction site thereby reducing the decomposition of the electrolyte solvent.
摘要:
A metal-air battery includes (a) an anode; (b) a cathode including a metal that reduces oxygen; (c) a housing for the anode and cathode having an air access that allows oxygen to contact the cathode; (d) a separator between the anode and the cathode; and (e) a hydrogen recombination catalyst within the housing. The hydrogen recombination catalyst can include a Pd, Pt, Ru metal or a salt thereof, and CuO.
摘要:
A process for heat treating an anode casing of a zinc/air depolarized cell after the casing has been formed but before anode material comprising zinc is inserted therein. The anode casing has a layer of copper on its inside surface. The process comprises heat treating the anode casing by passing a gas at a temperature between about 200° C. and 700° C., preferably between about 300° C. and 600° C. in contact therewith to form a heat treated anode casing and then cooling said heat treated anode casing to ambient temperature. The heat treated anode casing is stored away from atmospheric air until anode active material is inserted therein during cell assembly. The heat treating process significantly reduces gassing during cell discharge and storage and eliminates the need to add mercury to the anode material.
摘要:
An alkaline battery includes a cathode, an anode, a separator, an alkaline electrolyte, and a hydrogen recombination catalyst. The hydrogen recombination catalyst includes a hydrogen oxidizing material, such as CuO, and an activating material. The activating material includes a first activating component and a second activating component. The components of the activating material can be Pd, Pt, Ru metals or salts thereof.
摘要:
A non-aqueous electrochemical cell having a non-polymerizing substituted dioxolane electrolyte solvent and a highly oxidizing cathode depolarizer particularly manganese dioxide.
摘要:
A nonaqueous electrochemical cell and a method for the construction thereof wherein the cell contains a metal salt additive such as lithium nitrate (LiNO.sub.3) or calcium nitrate Ca(NO.sub.3).sub.2 which reduces the reactivity of substantially the entire active cathode surface. Electrolyte solvents such as propylene carbonate are thereby substantially prevented from reacting, on the surface of the cathode, with oxidizing agents within the cell. Decomposition of the electrolyte solvent with gaseous evolution is substantially reduced and cell stability is enhanced. The metal salt additives are particularly useful in nonaqueous cells containing manganese dioxide cathodes.
摘要:
Particulate MnO2, having simultaneously a micropore surface area greater than 8.0 m2/g, desirably between about 8.0 and 13 m2/g and BET surface area of between about 20 and 31 m2/g within the context of an MnO2 having a total intraparticle porosity of between about 0.035 cm3/g and 0.06 cm3/g produces enhanced performance when employed as cathode active material in an electrochemical cell, particularly an alkaline cell. The average pore radius of the meso and macro pores within the MnO2 (meso-macro pore radius) is desirably greater than 32 Angstrom.
摘要:
Particulate MnO2, having simultaneously a micropore surface area greater than 8.0 m2/g, desirably between about 8.0 and 13 m2/g and BET surface area of between about 20 and 31 m2/g within the context of an MnO2 having a total intraparticle porosity of between about 0.035 cm3/g and 0.06 cm3/g produces enhanced performance when employed as cathode active material in an electrochemical cell, particularly an alkaline cell. The average pore radius of the meso and macro pores within the MnO2 (meso-macro pore radius) is desirably greater than 32 Angstrom.
摘要:
Corrosion is prevented in a non-aqueous cell, having iron containing components kept at cathode potentials above 2.5 volts, by the inclusion within said cell of an additive comprised of a lewis base tertiary amine particularly heterocyclic imides such as 1,3-dimethylimidazolidinone and 3,5 dimethylisoxazole wherein all the nitrogens thereof contain no acidic protons.