There is provided a positive electrode for an alkaline secondary battery and an alkaline secondary battery having good output properties and cycle life. To that end, a positive electrode (10) for alkaline secondary battery is obtained by laminating a flexible metal substrate (11) having flexibility; a primer layer (12) having conductivity provided on one or both surfaces of the substrate (11); and a positive electrode composite material layer (13) provided on the primer layer (12) and containing a positive electrode active material, a binder resin, and a first conductive material.

A method of fabricating and using a zinc negative electrode and systems thereof are described. A zinc electroplated electrode including a layer of zinc metal bonded to a surface of an electrically conductive current collector is fabricated by an electroplating process using a zinc electroplating system. The zinc electroplating system includes: a zinc metal anode, a cathode including the current collector for plating zinc thereon, and an electrolyte bath comprising zinc ions. The electroplating process bonds the zinc metal to the surface of the current collector to create the electroplated zinc electrode. The electroplated zinc electrode is used as a negative electrode in a zinc metal cell. The zinc metal cell may be a primary cell or a secondary cell.

A negative electrode for an alkaline battery cell which includes zinc-based particles, wherein less than 20% of the zinc-based particles, by weight relative to the total zinc in the electrode, have a particle size of greater than about 150 micrometers, is provided. An alkaline electrochemical cell that includes the negative electrode and a method for reducing the gassing of the electrochemical cell is also provided.

An alkaline battery has a positive electrode mixture containing manganese dioxide and a conductive material filling a tubular positive electrode can that is closed at one end. A negative electrode mixture containing a zinc powder filling on an inner peripheral side of a separator is disposed on an inside of the positive electrode mixture. The negative electrode mixture contains zinc particles with a granularity of 75 μm or less at 25 to 40 mass %. The positive electrode mixture has a plurality of tubular pellets stacked inside the positive electrode can coaxially with the positive electrode can. A sum s of lengths of gaps between the pellets is set at 1 to 14% with respect to a sum d of lengths of the pellets. Thus, a sufficient amount of the electrolyte is held in the gaps and between the pellets in the positive electrode.

A method of fabricating and using a zinc negative electrode and systems thereof are described. A zinc electroplated electrode including a layer of zinc metal bonded to a surface of an electrically conductive current collector is fabricated by an electroplating process using a zinc electroplating system. The zinc electroplating system includes: a zinc metal anode, a cathode including the current collector for plating zinc thereon, and an electrolyte bath comprising zinc ions. The electroplating process bonds the zinc metal to the surface of the current collector to create the electroplated zinc electrode. The electroplated zinc electrode is used as a negative electrode in a zinc metal cell. The zinc metal cell may be a primary cell or a secondary cell.

A negative active material for an all solid-state includes an aggregated material of amorphous carbon having pores therein in which primary particles are aggregated, and metal nanoparticles filling in the pores.

A rechargeable zinc metal battery cell includes a zinc metal anode, a cathode, a porous separator between them, and an electrolyte composition absorbed by the porous separator and in contact with both anode and cathode. The electrolyte composition includes (i) an aqueous solution of zinc chloride at a concentration greater than 15 molal, and (ii) dimethyl carbonate present at a mass ratio between 0.1:1.0 and 1.0:1.0 with respect to water in the aqueous solution. In some examples: the anode includes zinc metal foil stacked on titanium metal foil; the cathode includes vanadium(V) phosphate; the porous separator includes glass fibers and is less than 200 μm thick; or the electrolyte composition includes (i) an aqueous solution of 30 molal zinc chloride, 5 molal lithium chloride, and 10 molal trimethyl ammonium chloride, and (ii) dimethyl carbonate present at a mass ratio of 1.0:1.0 with respect to water in the aqueous solution.

A method of: placing a mixture of zinc particles; water; a water-soluble thickener; and water-insoluble inorganic porogen particles into a mold; evaporating the water to form a monolith; heating the monolith to fuse the zinc particles together; and submerging the monolith in a liquid that removes the porogen particles. A method of: placing a mixture of zinc particles; an aqueous acetic acid solution; and porogen particles into a mold; evaporating water to form a monolith; and submerging the monolith in a liquid that removes the porogen particles.

The technology described in this document can be embodied in a method of using a silver-zinc rechargeable battery to power a device. The method includes drawing, in a first mode of operation of a power management circuit, a first current from the battery to power the device. The first current is selected such that a target percentage of a capacity of the battery is discharged in a predetermined time of use of the device. The method also includes switching to a second mode of operation after the target percentage of the capacity of the battery is discharged. In the second mode of operation, a second current is drawn from the battery, wherein the second current is less than the first current. The method further includes powering the device using the second current.

An alkaline electrochemical cell has a central cathode having a corresponding cathode current collector electrically connected with a positive terminal of the electrochemical cell. The cathode current collector has a tubular shape, such as a cylindrical shape or rectangular shape, extending parallel with the length of the central cathode. The cathode current collector is embedded within the central cathode, such as at a medial point of a radius of the central cathode, thereby minimizing the distance between the cathode current collector and any portion of the central cathode, thereby increasing the mechanical strength of the cathode and facilitating charge transfer to the cathode current collector.