Duracell U.S. Operations, Inc.

Paul Wildgust

Paul Albert Christian

Jennifer Anne Nelson

Fan Zhang

David Lloyd Anglin

Thomas Baccaro

Chaolan Hu

Provided are methods of preparing an electrochemically active cathode material including the steps of combining an alkali metal-containing nickel oxide having a formula ANiO, wherein A comprises an alkali metal and 0<a≤0.2, with a fluid composition including an oxidant comprising a peroxydisulfate salt, a monopersulfate salt, or a combination thereof to form a mixture, heating the mixture to a temperature of 50° C. or greater; and maintaining the mixture at the temperature for at least a period of time sufficient to form an alkali metal-deficient nickel oxide electrochemically active cathode material having a general formula AHNiO·nHO, wherein A comprises an alkali metal; 0.08≤x<0.2; 0≤y<0.3; 0.02≤a≤0.2; and 0<n<2.

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Bethel, CT, United States of America

Paul Wildgust