An aqueous rechargeable battery based on zinc anode and Na0.95MnO2

An aqueous rechargeable battery system is assembled by using metallic zinc and Na0.95MnO2 as the negative and positive electrodes, respectively. It is cheap and environmentally friendly, and its energy density is 78 Wh kg(-1). Its cycling performance is very good with only 8% capacity loss after 1000 cycles at 4 C between 1 and 2 V.