Additive for nickel-zinc battery

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A composition that contains nickel oxyhydroxide, nickel metal, ruthenium oxide (Ru02) and a binder is prepared as the cathode for a nickel-zinc battery. Metal oxide or hydroxide with a rare earth oxide may be included in the cathode to improve the electrode capacity and shelf life. Optionally, zinc oxide is added to the cathode to facilitate charger transfer and improve the characteristics of high rate discharging. The cathode significantly increases the charging efficiency, promotes the overpotential of oxygen evolution, and intensifies the depth of discharging, thereby increasing the overall efficiency and lifespan of the battery.