Na-1.5 square 0.5Mn1.5Fe1.5(FO4)(3) (where o denotes vacancies) microrods were obtained through a solvothermal synthesis in ethylene glycol. The combination of the XRD, Mossbauer and magnetic analyses confirm that the sodium vacancies in the Na-1.5 square 0.5Mn1.5Fe1.5(FO4)(3) structure are linked to the oxidation of Mn and Fe transition metals. The electrochemical tests have shown that Na-1.5 square 0.5Mn1.5Fe1.5(FO4)(3) is a dual electrode material for Li ion batteries. The electrochemical study in the potential range of 1.5-4.5 V indicate that such material can be used as 3 V cathode with specific capacities of 109, 97, and 80 mAh.g(-1) at current densities of 5, 10, and 20 mA.g(-1), respectively. When it is tested in the potential range of 0.03-3.0 V as negative electrode material, it delivers a reversible capacity of about 170 mA.g(-1) at 200 mA.g(-1) current density during > 100 cycles.