Eveready Battery Company, Inc.

Energizer Brands, LLC

Jack W. Marple

Mark a. Schubert

Jack W Marple

Michael Wemple

Weiwei Huang

Mark A Schubert

Duane James

Michael W Wemple

Violeta Z Leger

George Louis Schimek

Thomas J Sherry

Ronald Crawford

Samuel D Nave

George L Schimek

David A Kaplin

An alkaline electrochemical cell, preferably a zinc/air cell which includes a container; a negative electrode, a positive electrode, wherein said negative electrode and said positive electrode are disposed within the container, a separator located between the negative electrode and the positive electrode, and an alkaline electrolyte, wherein the negative electrode comprises zinc, and a branched chain fluorosurfactant. The fluorosurfactant is preferably a sulfotricarballylate surfactant with multiple fluorinated end groups.

Fluorosurfactant as a zinc corrosion inhibitor

An alkaline electrochemical cell, preferably a zinc/air cell which includes a container; a negative electrode, a positive electrode, wherein said negative electrode and said positive electrode are disposed within the container, and an alkaline electrolyte, wherein the negative electrode comprises zinc, a branched chain fluorosurfactant, barium sulfate (and, more specifically, amino- and/or epoxy-functionalized barium sulfate) and nano sized zinc oxide. The negative electrode composition supports high zinc to electrolyte weight ratios.

Zinc anode composition

A multi-faceted zinc-air electrochemical cell design holistically leverages interactions between components, especially with respect to conductive carbons from differing sources, lamination and the resulting impact it has on the air electrode's surface and other additives that impact the relative hydrophilicity of the membrane and/or performance of the anode, to improve the overall reliability and performance of the resulting battery.

Zinc-air electrochemical cell

A lithium/iron disulfide electrochemical battery cell with a high discharge capacity. The cell has a lithium negative electrode, an iron disulfide positive electrode and a nonaqueous electrolyte. The iron disulfide of the positive electrode has a controlled average particle size range which allows the electrochemical cells to exhibit desired properties in both low and high rate applications. In various embodiments, the iron disulfide particles are wet milled, preferably utilizing a media mill or milled utilizing a non-mechanical mill such as a jet mill, which reduces the iron disulfide particles to a desired average particle size range for incorporation into the positive electrode.

High discharge capacity lithium battery

The invention relates to primary electrochemical cells, in addition to methods for manufacturing and discharging the same, having a jellyroll electrode assembly that includes a positive electrode with a coating comprising iron disulfide deposited on a current collector situated on the outermost circumference of the jellyroll, a lithium-based negative electrode and a polymeric separator. More particularly, the invention relates to a cell design which optimizes cell capacity and substantially eliminates premature voltage drop-off on intermittent service testing by eliminating the edge effect through, for example, deliberately relieving stack pressure and/or extending the distance lithium ions proximate to the terminal end of the positive electrode must travel to undergo an electrochemical reaction in that region.

Lithium-iron disulfide cell design

A cathode, electrochemical cell and process for making either is disclosed. The cathode includes iron disulfide which exhibits multiple peaks representing distinct maxima of mean diameters for the volume-based particle size distribution. All of the maxima are less than 20 microns. A combination of natural pyrite ore and synthetic iron disulfide may be mixed to achieve the desired distribution, or a combination of natural pyrite ores may be processed in different manners to achieve the desired characteristics.

Particle size distribution variations in iron disulfide cathodes

High-capacity and high-reliability lithium iron disulfide cell designs and methods for making the same

The invention relates to primary electrochemical cells having a jellyroll electrode assembly that includes a lithium-based negative electrode, a positive electrode with a coating comprising iron disulfide deposited on a current collector and a polymeric separator. More particularly, the invention relates to a cell designs and cathode formulations incorporating specific types of conductors to improve cell performance.

Lithium-iron disulfide cathode formulation having pyrite content and low conductive additives

A lithium/iron disulfide electrochemical battery cell with a high discharge capacity. The cell has a lithium negative electrode, an iron disulfide positive electrode and a nonaqueous electrolyte. The positive electrode mixture containing the iron disulfide contains highly packed solid materials, with little space around the solid particles, to provide a high concentration of iron disulfide within the mixture. The separator is thin, to allow more space within the cell for active materials, yet strong enough to prevent short circuits between the positive and negative electrodes under abusive conditions, even when swelling of the cathode during cell discharge places additional stressed on the separator. As a result, the ratio of the interfacial capacity of the positive electrode to the electrode interfacial volume is high, as is the actual capacity on low rate/low power and high rate/high power discharge.

The invention relates to electrochemical cells having a jellyroll electrode assembly that includes a lithium-based negative electrode, a positive electrode with a coating comprising greater than about 94 wt. % of iron disulfide.

Electrochemical battery cells, and more particularly, to cells comprising a lithium negative electrode and an iron disulfide positive electrode. Before use in the cell, the iron disulfide has an inherent pH, or a mixture of iron disulfide and an pH raising additive compound have a calculated pH, of at least a predetermined minimum pH value. In a preferred embodiment, the pH raising additive compound comprises a Group IIA element of the Periodic Table of the Elements, or an acid scavenger or pH control agent such as an organic amine, cycloaliphatic epoxy, amino alcohol or overbased calcium sulfonate. In one embodiment, the iron disulfide particles utilized in the cell have a specific reduced average particle size range. Methods for preparing cathodes and electrochemical battery cells comprising such cathodes including (a) iron disulfide or (b) a mixture of iron disulfide and the pH raising additive compound, having (a) an inherent pH or (b) a calculated pH greater than or equal to a predetermined minimum value are disclosed.

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Avon, OH, United States of America

Jack W Marple