Silver nanowires were synthesized by polyol method to be used on the surface modification of silver cathodes in alkaline zinc-silver oxide batteries with the aim of increasing the electroactive area and improving its energy storage capacity. The morphological and structural characterization was performed by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV absorption. The modified electrodes were evaluated by using cyclic voltammetry and discharge curves of batteries. The energy storage capacity increased about 53.73% when the modified electrodes with silver nanowires were used.