A current collector for an electrochemical cell is described. Unlike conventional current collector designs, the current collector does not have an unperforated perimeter frame completely bordering or surrounding a perforated interior region. Instead, only that portion of the current collector adjacent to the connector tab is unperforated. Otherwise, perforations extend directly to the perimeter edge.

A method of fabricating a battery electrode includes forming a mixture including an electrode material and a binder; forming an electrode blank from the mixture; heating the electrode blank at a predetermined temperature for a predetermined time to form an annealed electrode blank; and laminating the annealed electrode blank to a current collector. The current collector may include a conductive carbon coating. In such event, the method may further include heating the current collector at a selected temperature for a selected time prior to laminating the annealed electrode blank to the current collector.

A method of fabricating a battery electrode includes forming a mixture including an electrode material and a binder; forming an electrode blank from the mixture; heating the electrode blank at a predetermined temperature for a predetermined time to form an annealed electrode blank; and laminating the annealed electrode blank to a current collector. The current collector may include a conductive carbon coating. In such event, the method may further include heating the current collector at a selected temperature for a selected time prior to laminating the annealed electrode blank to the current collector.

A thermally conductive board comprises a metal substrate, a foil containing copper, a thermally conductive and insulating layer and a barrier layer. The thermally conductive and electrically insulating layer is disposed on the metal substrate. The barrier layer is laminated between the foil containing copper and the thermally conductive and electrically insulating layer. The barrier is in direct contact with the foil containing copper, and the interface between the barrier layer and the foil containing copper comprises a microrough surface. The barrier layer has a Redox potential between 0 and −1V. The microrough surface has a roughness Rz of 2-18 μm.

An alkaline secondary battery disclosed in the present application includes: a positive electrode that is provided with a positive electrode mixture layer containing a silver oxide; a negative electrode; and an alkaline electrolyte. The positive electrode mixture layer further contains insulating inorganic particles and carbon particles. The carbon particles include graphite particles and carbon black particles. The negative electrode contains zinc-based particles selected from zinc particles and zinc alloy particles. The alkaline electrolyte contains potassium hydroxide or sodium hydroxide, and lithium hydroxide, and polyalkylene glycols. Further, in a charging method and a charging device for an alkaline secondary battery disclosed in the present application, a charging voltage during constant-voltage charging is set so that in the positive electrode, an oxidation reaction from silver to silver oxide (I) progresses while an oxidation reaction from silver oxide (I) to silver oxide (II) does not progress.

An alkaline secondary battery disclosed in the present application includes: a positive electrode that is provided with a positive electrode mixture layer containing a silver oxide; a negative electrode; and an alkaline electrolyte. The positive electrode mixture layer further contains insulating inorganic particles and carbon particles. The carbon particles include graphite particles and carbon black particles. The negative electrode contains zinc-based particles selected from zinc particles and zinc alloy particles. The alkaline electrolyte contains potassium hydroxide or sodium hydroxide, and lithium hydroxide, and polyalkylene glycols. Further, in a charging method and a charging device for an alkaline secondary battery disclosed in the present application, a charging voltage during constant-voltage charging is set so that in the positive electrode, an oxidation reaction from silver to silver oxide (I) progresses while an oxidation reaction from silver oxide (I) to silver oxide (II) does not progress.

Fabricating the electrode blank includes baking a blank precursor. The blank precursor contains the components of an electrode active medium including an active material. Fabricating the electrode blank also includes performing one or more post-bake calender operations on the blank precursor after baking the blank precursor. Each post-bake calender operation includes calendering the blank precursor.

Fabricating the electrode blank includes baking a blank precursor. The blank precursor contains the components of an electrode active medium including an active material. Fabricating the electrode blank also includes performing one or more post-bake calender operations on the blank precursor after baking the blank precursor. Each post-bake calender operation includes calendering the blank precursor.

A method includes mixing a solvent with a dry cathode mixture to form a slurry. The dry cathode mixture includes a cathode active material, a conductive diluent, and a polymeric binder. The method further includes removing the solvent from the slurry to form a composition and calendering, in a first calendering step, the composition to form a sheet. The calendering the composition includes passing the composition between calender rollers.

A method includes mixing a solvent with a dry cathode mixture to form a slurry. The dry cathode mixture includes a cathode active material, a conductive diluent, and a polymeric binder. The method further includes removing the solvent from the slurry to form a composition and calendering, in a first calendering step, the composition to form a sheet. The calendering the composition includes passing the composition between calender rollers.