用尽量简便的方法制备出δ、α、β及γ型4种MnO₂粉末. 通过X射线衍射（XRD）、场发射扫描电镜（FSEM）、热重分析（TGA）与比表面积测试（BET）等方法对样品粉末性质进行分析，并对4种不同粉末制成的电极进行循环伏安、恒流充放电及稳定性测试. 结果表明，4种MnO₂都具有良好的电容特性，其中α-MnO₂具有最高的比表面积与孔隙率，故其电极比容量最高，但其大电流放电时的倍率特性较差. 其余3种MnO₂比表面积相当，而β-MnO₂虽然比容量较低，但其简单的孔隙结构使其拥有最好的倍率特性与稳定性.

Four types of α-MnO₂, β-MnO₂, γ-MnO₂ and δ-MnO₂ powders were synthesized by relatively simple methods. The differences in crystal structures and surface morphologies for these forms of MnO₂ were investigated by using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA) and specific surface area analysis (BET). The electrochemical performances were characterized by cyclic voltammetry (CV) and stability analysis. Based on the experimental results, four kinds of MnO₂ electrodes showed good capacity properties, and the α-MnO₂ electrode had the largest specific capacity due to the highest specific surface area and porosity. The remaining three types of MnO₂ electrodes had similar specific surface areas, and the β-MnO₂ electrode had better rate discharge property and stability due to its lower developed pore structure.