Eveready Battery Company, Inc.

Christopher Fred Randell

Neal Charles White

Richard A Langan

Lewis F Urry

Nghia Cong Tang

Robert N Mansfield, Jr

David G Clash

David Kilby

An alkaline battery cell with increased discharge capacity is provided. Both the internal volume and the electrode interfacial surface area are increased, without unnecessarily increasing the overall cell volume, by increasing the height but not the diameter of the electrodes, thereby avoiding an unnecessary increase in the total cell volume.

Cylindrical alkaline cells with increased discharge performance

Alkaline electrochemical cells with substantially increased performance characteristics have a porous anode, with a porosity equal to or greater than 69%, and a porous cathode, comprising manganese dioxide and having a porosity equal to or greater than 26%.

Optimised alkaline electrochemical cells

An electrochemical cellwhich contains both a cathodeand an anodeThe anode contains a mixture of uniformly shaped particlesand electrolyte. The anode can also contain a zinc powder comprising non-uniform shaped, which can be mixed with the uniformly shaped particles of the present invention.

Zinc shapes for anodes of electrochemical cells

Alkaline electrochemical cells containing no added mercury and having a concentration of potassium hydroxide in the electrolyte, prior to discharge, of between about 34 and 37% (w/w solution) and wherein the amount of electrolyte is such that, after a calculated level of one electron discharge of the manganese dioxide, the calculated concentration of potassium hydroxide is between 49.5 and 51.5% (w/w solution), have superior performance in intermittent discharge tests.

Alkaline electrochemical cells with improved electrolyte

Polyoxyalkylene nitrogen containing compounds are useful in electrochemical cells having an acidic electrolyte to inhibit gassing and leakage.

Additives for electrochemical cells

Paper for use as a separator in an electrochemical cell completely absorbs a 50 &mgr;l drop of water placed thereon in a time of not less than four minutes and not greater than fifteen minutes at 20&deg; C. and provides an improve cell having less leakage and corrosive, especially in a mercury-free cell.

Paper separators for electrochemical cells

Alkaline zinc cells employing a brass anode current collection and little or no mercury and wherein a specific phosphate ester is added, preferably to the anode, to reduce gassing attributed to the brass anode current collector.

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Durham, United Kingdom

Christopher Fred Randell