The Gillette Company

Duracell U.S. Operations, Inc.

Gary A Miller

Stuart Michael Davis

Shuming Zeng

Tae-Won Lee

Alexander A Leef

Terry Copeland

Kirakodu S Nanjundaswamy

Jennifer Anne Nelson

Peter R Moses

Fan Zhang

Thomas C Richards

Yichun Wang

Javit A Drake

Richard Edward Durkot

Rimma A Sirotina

James Joseph Cervera

A battery includes a housing, an anode and a cathode within the housing, the anode having a first portion and a second portion adjacent to each other, a current collector at least partially disposed in the anode, a separator between the anode and the cathode, and an anode portion separator at least partially disposed in the anode and between the first and second portions of the anode.

Batteries having multiple anode portions

A primary battery includes a cathode having an acid-treated manganese dioxide, an anode, a separator between the cathode and the anode, and an alkaline electrolyte.

Acid-treated manganese dioxide and methods of making thereof

Ozonated manganese dioxide is prepared by an ozonation process and utilized as a cathode active material. An ozone containing gas stream contacts manganese dioxide and produces ozonated manganese dioxide with high efficiency. After preparation, ozonated manganese dioxide is stored for a limited time at a low temperature and incorporated into a cathode active material for alkaline batteries.

Ozonating manganese dioxide

A cathode having a groove extending about 10 to about 450 microns into a surface of the cathode. The cathode can also be roughened.

Battery cathode

A process for manufacture of manganese dioxide comprising subjecting an aqueous bath comprising manganese sulfate (MnSO ) and sulfuric acid (H SO ) to electrolysis in a closed cell wherein the electrolysis bath is maintained at an elevated temperature above 110&deg; C., preferably above 115&deg; C. and at superatmospheric pressure. Desirably the bath can be maintained at an elevated temperature between about 115&deg; C. and 155&deg; 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 MnO product having a specific surface area (SSA) within desired range of between 18-45 m /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 MnO product. The manganese dioxide product in zinc/MnO alkaline cells gives excellent service life, particularly in high power application.

Process for manufacture and improved manganese dioxide for electrochemical cells

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Milton, MA, United States of America

Gary A Miller