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An aqueous rechargeable sodium battery (ARSB) system has been developed by using metallic zinc, a rod-like Na0.95MnO2 and an aqueous solution of 0.5 mol L-1 Zn(CH3COO)2 and 0.5 mol L-1 CH3COONa as the negative electrode, positive one and the electrolyte, respectively.During the discharge and charge processes,dissolution and plating of Zn for the negative electrode and intercalation and de-intercalation of Na+ ion into/from the Na0.95MnO2 happen