水系锌电池Se@Zn负极的制备及性能

Preparation and Performance of Se@Zn Anode for Aqueous Zinc Battery

采用原位化学反应策略,在Zn电极表面生长出Se单质,通过XRD、XPS、SEM和能谱表征,结果表明Se在Zn电极表面的成功合成,且Se在锌电极表面均匀分布。将Se@Zn电极和裸Zn电极分别组装为对称电池和以MnO2为正极的全电池进行性能比较,结果表明,Se@Zn对称电池在1 mA/cm^(2)下可以运行1000小时以上,并保持27mV的极化电压。Se@Zn||MnO_(2)全电池在2A/g电流密度下容量为136mA·h/g,在1000次循环后,Se@Zn||MnO_(2)全电池仍接有近100%的库仑效率,容量保持率为88%。

Using an in-situ chemical reaction strategy,a layer of Se simple substance was grown on the surface of the Zn electrode.The successful synthesis of the Se simple substance layer on the surface of the Zn electrode was confirmed by XRD and XPS characterization methods,and the Se and uniform distribution of Zn element.The Se@Zn electrode and the bare Zn electrode was assembled into a symmetric cell and a full cell with MnO2 as the positive electrode for performance comparison.The results show that the Se@Zn symmetric cell achieves a stability of 1000 h at 1 mA/cm^(2) and maintains a polarization voltage of 27 mV.The capacity of the Se@Zn||MnO_(2) full battery is 136 mA h/g at a current density of 2 A/g,and after 1000 cycles,the Se@Zn||MnO_(2) full battery still maintains a high capacity of nearly 100%coulombic efficiency and 88%capacity retention。