Abstract
Ag-doped LiMn 2O 4 thin films derived from solution deposition were studied comparatively with LiMn 2O 4 by X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, and galvanostatic charge–discharge experiments. The results show that the Ag-doped LiMn 2O 4 film is a composite of LiMn 2O 4 and Ag metal. The film is homogeneous and crack free with some conglomerations of silver. The Ag-doped LiMn 2O 4 thin-film has a lower polarization and offers higher capacity retention than the undoped one. The difference of capacity retention between the two films becomes larger with the increase of the charge–discharge current density, suggesting that the Ag-doped LiMn 2O 4 has a better cycling behavior, especially at higher charge–discharge current density.
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