采用水热法原位合成二氧化锰( MnO2)/膨胀石墨( EG)复合材料，利用扫描电子显微镜( SEM)、x-射线衍射仪(XRD)、热重分析仪(TGA)对材料进行表征，并将所制MnO2/EG复合材料(MEG)作为超级电容器电极，采用循环伏安、恒电流充放电和交流阻抗谱等方法进行电化学性能测试。结果表明，纳米MnO2沉积填充在EG中，提高了材料导电性和稳定性；与纯MnO2相比，复合材料不但具有较高的倍率性能，而且在1000次循环后电容保持率高达100%。
Nanostructured MnO2/exfoliated graphite ( EG) composites were prepared by an in-situ hydrothermal method, and were characterized by scanning electron microscopy, X-ray diffraction and thermal gravimetric analysis. Their electrochemical per-formance was investigated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. Re-sults show that the nanostructured MnO2 is inserted between the EG layers, and their conductivity and electrochemical stability are significantly improved. The composites have an improved rate performance compared with the pure MnO2 . The capacitance reten-tion rate of the composites and pure MnO2 are 100 and 94. 3% after 1000 cycles at a current density of 1 A/g, indicating that the stability of the composites is better than that of pure MnO2 .
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