NaMO2 (M=Co, Cr, Ni, Mn or Fe) acid-free lead sodium secondary battery and preparation method thereof

The invention discloses a NaMO2 (M=Co, Cr, Ni, Mn or Fe) acid-free lead sodium secondary battery and its preparation method. By using foamed aluminium, foamed nickel or foamy copper as a current collector, using NaMO2 (M=Co, Cr, Ni, Mn or Fe) as a battery positve active material, using analytically pure PbSO4 as a battery negative active material, using PTFE as a binder and using graphite and acetylene black as a conductive agent, positive and negative plates are prepared; and by using glass fiber as a diaphragm and using neutral Na2SO4 as an electrolyte, the NaMO2 (M=Co, Cr, Ni, Mn or Fe) acid-free lead sodium secondary battery is assembled. By the preparation method, charge and discharge performance of the battery can be enhanced remarkably, and service life of the battery is prolonged. In addition, usage amount of lead in a lead-acid storage battery is reduced, sulfuric acid is removed, and the battery is more environmentally friendly.