Abstract
Impedance study was carried out for the interfaces between lithium, polyaniline (PAn), lithium-doped MnO 2 and modified poly(ethylene oxide) (PEO) electrolyte under various conditions. The interfacial charge-transfer resistance R ct on PEO/PAn, R ct on PEO/LiMn 2O 4 increase with depth-of-discharge and decrease after the charge of the cell containing modified PEO as electrolyte. The charge-transfer resistance R ct on PEO/PAn is higher than R ct on PEO/LiMn 2O 4 under the same condition, since inserted species and mechanism are different for both cases. In the case of PAn, an additional charge-transfer resistance might be related to the electronic conductivity change in discharge/charge potential range, as it was evident from a voltammetry curve. With increasing cycle numbers, the charge-transfer resistance increases gradually. The impedance results also have shown that at low frequency the diffusion control is dominant in the process of the charge and discharge of Li/PEO/PAn or Li/PEO/LiMn 2O 4 cell. The diffusion coefficients have been calculated from impedance data.
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