基于Zn掺杂α-MnO_(2)的NH_(4)^(+)混合电容器及其电化学性能研究  

Research on Zn doping α-MnO_(2) of NH_(4)^(+)hybrid capacitor and its electrochemical performance

作　　者：岳圆圆 颜东亮[1,2] YUE Yuanyuan;YAN Dongliang(School of Materials Science and Engineering,Guilin University of Electronic of Technology,Guilin 541004,China;School of Materials and Environment,Guangxi Minzu University,Nanning 530006,China)

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004 [2]广西民族大学材料与环境学院,南宁530006

出　　处：《桂林电子科技大学学报》2024年第5期475-481,共7页Journal of Guilin University of Electronic Technology

基　　金：国家自然科学基金(51974098,52264034);广西自然科学基金(2020GXNSFAA159037)。

摘　　要：NH4+混合电容器电极材料易溶解于酸性电解液,使材料主体结构坍塌,导致容量衰减过快,限制了NH_(4)^(+)混合电容器的广泛应用。通过一步水热法制备了隧道结构的Zn_(x)MnO_(2)材料,并通过XRD、SEM、FTIR、XPS等手段对Zn_(x)MnO_(2)正极进行了表征。对Zn_(x)MnO_(2)材料进行电化学性能测试,Zn_(x)MnO_(2)材料在0.5A/g的电流密度下容量稳定后可达350F/g;采用隧道Zn_(x)MnO_(2)作为正极材料,商用活性碳作为负极,构成了一种新型的铵离子混合超级电容器(A-HSC);该电容器可在0~1.6 V的电压窗口内稳定工作,能量密度达86 Wh/kg,具有较高的电压窗口;在5 A/g的电流密度下循环5000圈后仍有80%的容量,具有优异的循环稳定性。Zn_(x)MnO_(2)是一种很有前途的NH4+储存电极材料,对构建新一代的水系铵离子电容器具有重要意义。The electrode materials of NH_(4)^(+)hybrid capacitors are easily dissolved in acidic electrolyte,which leads to the collapse of bulk structure of the material,and excessively rapid capacity decay,thus limiting the extensive application of NH_(4)^(+)hybrid capacitors.The tunnel structured Zn_(x)MnO_(2) materials are prepared through one step hydrothermal method,which are characterized by XRD,SEM,FTIR,and XPS for Zn_(x)MnO_(2) cathode.Electrochemical performance test of Zn_(x)MnO_(2) materials shows the capacity of Zn_(x)MnO_(2) material can achieve 350 F/g upon stabilization with current density of 0.5 A/g.A novel ammonium ion hybrid supercapacitor(A-HSC)is constructed with tunneling Zn_(x)MnO_(2) as the cathode material and commercial activated carbon as the negative electrode;The capacitor has a high voltage window which can work stably within in the voltage window of 0-1.6 V and provides energy density of 86 Wh/kg.The excellent cycling stability with 80% capacity remains after 5000 cycles at a current density of 5 A/g.The hybrid capacitor proves that Zn_(x)MnO_(2) is a promising NH4+storage electrode material,which is significant for the construction of a new generation of aqueous ammonium ion capacitors.

关 键 词：铵离子 正极材料 隧道结构 水系储能 Zn^(2+)掺杂 

分 类 号：TK-9[动力工程及工程热物理]