In order to further improve the performance of zinc-ion batteries,the cathodes and anodes of the battery were designed at the same time.Manganese dioxide (MnO2) with different crystallines was synthesized by liquid-phase coprecipitation with different proportions of ammonium persulfate ((NH4)2S2O8) and manganese sulfate (MnSO4).It was found that with the increase of the molar concentration ratio of (NH4)2S2O8∶MnSO4,the crystalline of MnO2 gradually changed from urchin-like γ-MnO2 to fine rod-like α-MnO2.The specific capacity of γ-MnO2 was higher than that of α-MnO2.Under the current density of 0.1A/g,the specific capacity of Zn-ion batteries with γ-MnO2 cathode can reach 354mAh/g,while the specific capacity of Zn-ion batteries with α-MnO2 cathode was 200mAh/g.Then Sn/Zn composite metal anode was prepared by electrodeposition of zinc on Sn substrate.Finally,the high capacity of γ-MnO2 was selected as the cathode,and matched with Sn/Zn anode to assemble the γ-MnO2Sn/Zn Zn-ion batteries.The capacity of 125mAh/g was maintained after 1000 cycles under the current density of 1A/g.
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基金资助
中美国际科技合作项目(2016YFE0102200);深圳市技术计划项目(JCYJ20160301154114273)
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