Rechargeable metal-air batteries have been gained much attention because of their high energy densities. As a newly developed member of metal-air batteries,great efforts have been devoted to sodium-air batteries(SABs). SABs are still in an infant stage and many problems needs to be solved.As well-known, cathode is the key of oxygen reduction reaction (ORR) and oxygen evolution reduction(OER). In this work, MnCo₂O₄  microspheres have been synthesized and demonstrated as a highly efficient electrocatalyst for the air cathode of sodium-air cell. The cell shows an initial discharge capacity of 7709.4 mAh/g(based on the carbon mass vs. Na). The crystal structure and phase purity of MnCo₂O₄ are confirmed from powder XRD patterns shown in Fig.1. The diameter of MnCo₂O₄ varies from 1 to 2 μm and the morphology has a high dependence on the synthesis temperature, as shown in Fig. 2. The electrochemcial performance of the MnCo₂O₄@ carbon black was compared with the carbon black as air electrode in oxygen evolution reduction(OER) and oxygen reduction reaction (ORR). For the first discharge profiles shown in Fig.3a, the discharge capacity of the MnCo₂O₄ microspheres is 4882.6 mAh/g, nearly about 10 times over carbon black. By the modification of the morphology, MnCo₂O₄ microspheres exhibited much greater discharge and charge abilities, as shown in Fig. 3b. The cycling stability of the as-proposed MnCo₂O₄ electrode was shown in Fig.3c.