Long-life alkaline primary battery
This invention relates to an alkaline primary battery of the type having a negative electrode containing cadmium of amalgamated zinc and a positive electrode containing monovalent silver oxide, mercuric oxide, or mixtures of these oxides with manganese dioxide, the positive electrode having an electrochemically active surface area facing the negative electrode. At positive electrodes, self-discharge can be caused by the solubility of the active material. It is an object of this invention to provide an improved alkaline primary battery designed to reduce this type of self-discharge, without impairing the internal resistance of the battery. To this end, in the alkaline primary battery the improvement comprises at least one electrically conductive, microporous, electrolyte-saturated, optically opaque filter-electrode which covers the entire active surface area of the positive electrode, contains either no monovalent silver oxide nor mercuric oxide or only a substantially smaller amount thereof per unit of volume than the positive electrode, contains electrically conductive material which is not corroded, oxidized, nor dissolved in alkali electrolytes at the given potential of the positive electrode, and is in electrical contact with the positive electrode.
- Assignee:
- Leclanche Sa (Switzerland)
- Patent Number(s):
- US 4192914
- OSTI ID:
- 5775375
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
250901* -- Energy Storage-- Batteries-- Design & Development
250903 -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
CHALCOGENIDES
CHEMICAL COATING
DEPOSITION
DESIGN
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTROCHEMICAL COATING
ELECTRODES
FILTERS
MANGANESE COMPOUNDS
MANGANESE OXIDES
METAL-METAL OXIDE BATTERIES
OXIDES
OXYGEN COMPOUNDS
POROSITY
SILVER-CADMIUM BATTERIES
SILVER-ZINC BATTERIES
SURFACE AREA
SURFACE COATING
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS